401
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Alias MS, Liu Z, Al-Atawi A, Ng TK, Wu T, Ooi BS. Continuous-wave optically pumped green perovskite vertical-cavity surface-emitter. OPTICS LETTERS 2017; 42:3618-3621. [PMID: 28914916 DOI: 10.1364/ol.42.003618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 08/17/2017] [Indexed: 06/07/2023]
Abstract
We report an optically pumped green perovskite vertical-cavity surface-emitter operating in continuous-wave (CW) with a power density threshold of ∼89 kW/cm2. The device has an active region of CH3NH3PbBr3 embedded in a dielectric microcavity; this feat was achieved with a combination of optimal spectral alignment of the optical cavity modes with the perovskite optical gain, an adequate Q-factor of the microcavity, adequate thermal stability, and improved material quality with a smooth, passivated, and annealed thin active layer. Our results signify a way towards efficient CW perovskite emitter operation and electrical injection using low-cost fabrication methods for addressing monolithic optoelectronic integration and lasing in the green gap.
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402
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Wu L, Hu H, Xu Y, Jiang S, Chen M, Zhong Q, Yang D, Liu Q, Zhao Y, Sun B, Zhang Q, Yin Y. From Nonluminescent Cs 4PbX 6 (X = Cl, Br, I) Nanocrystals to Highly Luminescent CsPbX 3 Nanocrystals: Water-Triggered Transformation through a CsX-Stripping Mechanism. NANO LETTERS 2017; 17:5799-5804. [PMID: 28806517 DOI: 10.1021/acs.nanolett.7b02896] [Citation(s) in RCA: 180] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We report a novel CsX-stripping mechanism that enables the efficient chemical transformation of nonluminescent Cs4PbX6 (X = Cl, Br, I) nanocrystals (NCs) to highly luminescent CsPbX3 NCs. During the transformation, Cs4PbX6 NCs dispersed in a nonpolar solvent are converted into CsPbX3 NCs by stripping CsX through an interfacial reaction with water in a different phase. This process takes advantage of the high solubility of CsX in water as well as the ionic nature and high ion diffusion property of Cs4PbX6 NCs, and produces monodisperse and air-stable CsPbX3 NCs with controllable halide composition, tunable emission wavelength covering the full visible range, narrow emission width, and high photoluminescent quantum yield (up to 75%). An additional advantage is that this is a clean synthesis as Cs4PbX6 NCs are converted into CsPbX3 NCs in the nonpolar phase while the byproduct of CsX is formed in water that could be easily separated from the organic phase. The as-prepared CsPbX3 NCs show enhanced stability against moisture because of the passivated surface. Our finding not only provides a new pathway for the preparation of highly luminescent CsPbX3 NCs but also adds insights into the chemical transformation behavior and stabilization mechanism of these emerging perovskite nanocrystals.
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Affiliation(s)
- Linzhong Wu
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Huicheng Hu
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Yong Xu
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
- Department of Chemistry, University of California, Riverside , Riverside, California 92521 United States
| | - Shu Jiang
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Min Chen
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Qixuan Zhong
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Di Yang
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Qipeng Liu
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Yun Zhao
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Baoquan Sun
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Qiao Zhang
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , 199 Ren'ai Road, Suzhou, 215123, Jiangsu People's Republic of China
| | - Yadong Yin
- Department of Chemistry, University of California, Riverside , Riverside, California 92521 United States
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403
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Sarkar S, Ravi VK, Banerjee S, Yettapu GR, Markad GB, Nag A, Mandal P. Terahertz Spectroscopic Probe of Hot Electron and Hole Transfer from Colloidal CsPbBr 3 Perovskite Nanocrystals. NANO LETTERS 2017; 17:5402-5407. [PMID: 28831807 DOI: 10.1021/acs.nanolett.7b02003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Colloidal all inorganic CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have emerged to be an excellent material for applications in light emission, photovoltaics, and photocatalysis. Efficient interfacial transfer of photogenerated electrons and holes are essential for a good photovoltaic and photocatalytic material. Using time-resolved terahertz spectroscopy, we have measured the kinetics of photogenerated electron and hole transfer processes in CsPbBr3 NCs in the presence of benzoquinone and phenothiazine molecules as electron and hole acceptors, respectively. Efficient hot electron/hole transfer with a sub-300 fs time scale is the major channel of carrier transfer thus overcomes the problem related to Auger recombination. A secondary transfer of thermalized carriers also takes place with time scales of 20-50 ps for electrons and 137-166 ps for holes. This work suggests that suitable interfaces of CsPbX3 NCs with electron and hole transport layers would harvest hot carriers, increasing the photovoltaic and photocatalytic efficiencies.
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Affiliation(s)
- Sohini Sarkar
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
| | - Vikash Kumar Ravi
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
| | - Sneha Banerjee
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
| | - Gurivi Reddy Yettapu
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
| | - Ganesh B Markad
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
| | - Angshuman Nag
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
| | - Pankaj Mandal
- Department of Chemistry, Indian Institute of Science Education and Research , Pune 411008, Maharashtra India
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404
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Li L, Sun Z, Wang P, Hu W, Wang S, Ji C, Hong M, Luo J. Tailored Engineering of an Unusual (C4
H9
NH3
)2
(CH3
NH3
)2
Pb3
Br10
Two-Dimensional Multilayered Perovskite Ferroelectric for a High-Performance Photodetector. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705836] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lina Li
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Zhihua Sun
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Peng Wang
- National Laboratory for Infrared Physics; Shanghai Institute of Technical Physics; Chinese Academy of Sciences; Shanghai 200083 China
| | - Weida Hu
- National Laboratory for Infrared Physics; Shanghai Institute of Technical Physics; Chinese Academy of Sciences; Shanghai 200083 China
| | - Sasa Wang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Chengmin Ji
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Maochun Hong
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Junhua Luo
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
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405
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Li L, Sun Z, Wang P, Hu W, Wang S, Ji C, Hong M, Luo J. Tailored Engineering of an Unusual (C4
H9
NH3
)2
(CH3
NH3
)2
Pb3
Br10
Two-Dimensional Multilayered Perovskite Ferroelectric for a High-Performance Photodetector. Angew Chem Int Ed Engl 2017; 56:12150-12154. [DOI: 10.1002/anie.201705836] [Citation(s) in RCA: 186] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Lina Li
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Zhihua Sun
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Peng Wang
- National Laboratory for Infrared Physics; Shanghai Institute of Technical Physics; Chinese Academy of Sciences; Shanghai 200083 China
| | - Weida Hu
- National Laboratory for Infrared Physics; Shanghai Institute of Technical Physics; Chinese Academy of Sciences; Shanghai 200083 China
| | - Sasa Wang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Chengmin Ji
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Maochun Hong
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
| | - Junhua Luo
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou Fujian 350002 China
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406
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Huang Y, Xiao L, An T, Lim W, Wong T, Sun H. Fast Dynamic Visualizations in Microfluidics Enabled by Fluorescent Carbon Nanodots. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1700869. [PMID: 28696529 DOI: 10.1002/smll.201700869] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/02/2017] [Indexed: 06/07/2023]
Abstract
Microfluidic systems have become a superior platform for explorations of fascinating fluidic physics at microscale as well as applications in biomedical devices, chemical reactions, drug delivery, etc. Exploitations of this platform are built upon the fundamental techniques of flow visualizations. However, the currently employed fluorescent materials for microfluidic visualization are far from satisfaction, which severely hinders their widespread applications. Here fluorescent carbon nanodots are documented as a game-changer, applicable in versatile fluidic environment for the visualization in microfluidics with unprecedented advantages. One of the fastest fluorescent imaging speeds up to 2500 frames per second under a normal contionous wave (CW) laser line is achieved by adopting carbon nanodots in microfluidics. Besides better visualizations of the fluid or interface, fluorescent carbon nanodots-based microparticles enable quantitative studies of high speed dynamics in fluids at microscale with a more than 90% lower cost, which is inaccessible by traditionally adopted fluorescent dye based seeding particles. The findings hold profound influences to microfluidic investigations and may even lead to revolutionary changes to the relevant industries.
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Affiliation(s)
- Yi Huang
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Lian Xiao
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Tingting An
- College of Life Sciences, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, China
| | - Wenxiang Lim
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Teckneng Wong
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Handong Sun
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
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407
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Li X, Wang Y, Sun H, Zeng H. Amino-Mediated Anchoring Perovskite Quantum Dots for Stable and Low-Threshold Random Lasing. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28758693 DOI: 10.1002/adma.201701185] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 05/21/2017] [Indexed: 04/14/2023]
Abstract
Halide perovskite quantum dots (Pe-QDs) have been considered as outstanding candidates for photodetector, light-emitting diode, and lasing applications, but these perspectives are being impeded by the severe stability, including both chemical and optical degradations. This study reports on amino-mediated anchoring Pe-QDs onto the surfaces of monodisperse silica to effectively depress the optical degradation of their photoluminescence (PL) and random lasing stabilities, hence achieving highly stable and low-threshold lasing. An amination-mediated nucleation and growth process is designed for the general and one-pot synthesis of Pe-QDs on the surfaces of silica spheres. The facile synthetic process, which can be finished within several minutes, insures scalable production. Surprisingly, almost no PL degradation is observed after 40 d storage under ambient conditions, even 80% PL intensity can be maintained after persistently illuminated by UV lamps for 108 h. Subsequently, extremely stable random lasing is achieved after storage for 2 months or over continuously optical pumping for 8 h. Such high PL and lasing stabilities originate from the isolation effects due to the effective anchoring, which separate the Pe-QDs from each other and inhibit the photoinduced regrowth and deterioration. This work will also open the window of perovskite-based multifunctional systems.
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Affiliation(s)
- Xiaoming Li
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Yue Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), Nanyang Technological University, Singapore, 637371, Singapore
| | - Handong Sun
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), Nanyang Technological University, Singapore, 637371, Singapore
| | - Haibo Zeng
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
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408
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Wang Y, Yu D, Wang Z, Li X, Chen X, Nalla V, Zeng H, Sun H. Solution-Grown CsPbBr 3 /Cs 4 PbBr 6 Perovskite Nanocomposites: Toward Temperature-Insensitive Optical Gain. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1701587. [PMID: 28696554 DOI: 10.1002/smll.201701587] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 06/08/2017] [Indexed: 05/21/2023]
Abstract
With regards to developing miniaturized coherent light sources, the temperature-insensitivity in gain spectrum and threshold is highly desirable. Quantum dots (QDs) are predicted to possess a temperature-insensitive threshold by virtue of the separated electronic states; however, it is never observed in colloidal QDs due to the poor thermal stability. Besides, for the classical II-VI QDs, the gain profile generally redshifts with increasing temperature, plaguing the device chromaticity. Herein, this paper addresses the above two issues simultaneously by embedding ligands-free CsPbBr3 nanocrystals in a wider band gap Cs4 PbBr6 matrix by solution-phase synthesis. The unique electronic structures of CsPbBr3 nanocrystals enable temperature-insensitive gain spectrum while the lack of ligands and protection from Cs4 PbBr6 matrix ensure the thermal stability and high temperature operation. Specifically, a color drift-free stimulated emission irrespective of temperature change (20-150 °C) upon two-photon pumping is presented and the characteristic temperature is determined to be as high as ≈260 K. The superior gain properties of the CsPbBr3 /Cs4 PbBr6 perovskite nanocomposites are directly validated by a vertical cavity surface emitting laser operating at temperature as high as 100 °C. The results shed light on manipulating optical gain from the advantageous CsPbBr3 nanocrystals and represent a significant step toward the temperature-insensitive frequency-upconverted lasers.
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Affiliation(s)
- Yue Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Dejian Yu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Zeng Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Xiaoming Li
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
- State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
| | - Xiaoxuan Chen
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Venkatram Nalla
- Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Haibo Zeng
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Handong Sun
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
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409
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Sun H, Yang Z, Wei M, Sun W, Li X, Ye S, Zhao Y, Tan H, Kynaston EL, Schon TB, Yan H, Lu ZH, Ozin GA, Sargent EH, Seferos DS. Chemically Addressable Perovskite Nanocrystals for Light-Emitting Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28692786 DOI: 10.1002/adma.201701153] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/02/2017] [Indexed: 05/04/2023]
Abstract
Whereas organic-inorganic hybrid perovskite nanocrystals (PNCs) have remarkable potential in the development of optoelectronic materials, their relatively poor chemical and colloidal stability undermines their performance in optoelectronic devices. Herein, this issue is addressed by passivating PNCs with a class of chemically addressable ligands. The robust ligands effectively protect the PNC surfaces, enhance PNC solution processability, and can be chemically addressed by thermally induced crosslinking or radical-induced polymerization. This thin polymer shield further enhances the photoluminescence quantum yields by removing surface trap states. Crosslinked methylammonium lead bromide (MAPbBr3 ) PNCs are applied as active materials to build light-emitting diodes that have low turn-on voltages and achieve a record luminance of over 7000 cd m-2 , around threefold better than previous reported MA-based PNC devices. These results indicate the great potential of this ligand passivation approach for long lifespan, highly efficient PNC light emitters.
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Affiliation(s)
- Haizhu Sun
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
- College of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University, 5268, Renmin Street, Changchun, 130024, P. R. China
| | - Zhenyu Yang
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Mingyang Wei
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Wei Sun
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Xiyan Li
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Shuyang Ye
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Yongbiao Zhao
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
- Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada
| | - Hairen Tan
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Emily L Kynaston
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Tyler B Schon
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Han Yan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Zheng-Hong Lu
- Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada
| | - Geoffrey A Ozin
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Edward H Sargent
- The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
| | - Dwight S Seferos
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
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410
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Xiao L, Wang Y, Huang Y, Wong T, Sun H. Self-trapped exciton emission from carbon dots investigated by polarization anisotropy of photoluminescence and photoexcitation. NANOSCALE 2017; 9:12637-12646. [PMID: 28825435 DOI: 10.1039/c7nr03913a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Carbon dots have attracted tremendous attention because of their intrinsic advantages that open up opportunities to replace traditional fluorescent materials in various application fields. However, until now, the emission mechanism from carbon dots has been controversial, substantially hindering the extensive exploitation of these materials. Here, we explore systematically the essential emission behavior of carbon dots by using polarization anisotropy spectroscopy, electric-field modulation spectroscopy, and time-resolved photoluminescence measurements. We probe the momentum evolution dynamics and evaluate the decay process of the photoexcited hot carriers, which manifest characteristics that are distinct from band edge emission. We provide clear evidence that carbon dot emission originates from radiative recombination of self-trapped excitons, where the mobilization of the carriers is largely impeded due to the existence of a strong local potential field and thus the relaxation of the hot carriers is strongly suppressed. Based on the self-trapped exciton model, all the optical properties of carbon dots inferred from both steady-state and time-resolved optical spectroscopy can be interpreted consistently. Our investigation provides an alternative insight into the emission mechanisms of carbon dots, which may improve our understanding of these novel materials.
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Affiliation(s)
- Lian Xiao
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.
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411
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Yang B, Chen J, Hong F, Mao X, Zheng K, Yang S, Li Y, Pullerits T, Deng W, Han K. Lead‐Free, Air‐Stable All‐Inorganic Cesium Bismuth Halide Perovskite Nanocrystals. Angew Chem Int Ed Engl 2017; 56:12471-12475. [DOI: 10.1002/anie.201704739] [Citation(s) in RCA: 384] [Impact Index Per Article: 54.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 06/30/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Feng Hong
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Xin Mao
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Yajuan Li
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
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412
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Yang B, Chen J, Hong F, Mao X, Zheng K, Yang S, Li Y, Pullerits T, Deng W, Han K. Lead‐Free, Air‐Stable All‐Inorganic Cesium Bismuth Halide Perovskite Nanocrystals. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704739] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bin Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Feng Hong
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Xin Mao
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Songqiu Yang
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Yajuan Li
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
- University of the Chinese Academy of Sciences Beijing 100039 P. R. China
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Chemical Center Lund University P.O. Box 124 22100 Lund Sweden
| | - Weiqiao Deng
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Science Dalian 116023 P. R. China
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413
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Liang J, Wang C, Zhao P, Lu Z, Ma Y, Xu Z, Wang Y, Zhu H, Hu Y, Zhu G, Ma L, Chen T, Tie Z, Liu J, Jin Z. Solution synthesis and phase control of inorganic perovskites for high-performance optoelectronic devices. NANOSCALE 2017; 9:11841-11845. [PMID: 28792059 DOI: 10.1039/c7nr03530f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An efficient method to synthesize well-crystallized inorganic cesium lead halide perovskites (CsPbX3, X = I or Br) with high yield and high reproducibility was proposed. Notably, the as-prepared CsPbI3 in the yellow orthorhombic phase (y-CsPbI3) can be easily converted to the black cubic perovskite phase CsPbI3 (b-CsPbI3) after thermal annealing. Furthermore, two-terminal photodetectors and all-inorganic perovskite solar cells based on b-CsPbI3 were fabricated, exhibiting high performances.
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Affiliation(s)
- Jia Liang
- Key Laboratory of Mesoscopic Chemistry of MOE and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210093, China.
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414
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Gao G, Xi Q, Zhou H, Zhao Y, Wu C, Wang L, Guo P, Xu J. Novel inorganic perovskite quantum dots for photocatalysis. NANOSCALE 2017; 9:12032-12038. [PMID: 28795754 DOI: 10.1039/c7nr04421f] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Herein, we report the performance of CsPbX3 (X = Cl, Br, and I) perovskite quantum dots (QDs) for photocatalytic degradation of organic dyes. The photocatalytic performance of CsPbX3 QDs was characterized by UV-vis absorption spectra and ESI-MS, which evaluated their ability of degrading methyl orange (MO) solution under visible light irradiation. Interestingly, both CsPbCl3 and CsPbBr3 QDs show excellent photocatalytic activities, which can decompose the MO solution into a colorless solution within 100 min. This study demonstrates the potential of CsPbX3 QDs in the degradation of organic dyes and environmentally friendly applications. Moreover, the integration of CsPbX3 QDs and photocatalysis provides a new insight for the design of new photocatalysts.
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Affiliation(s)
- Ge Gao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin 130022, China.
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415
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Zhang L, Zeng Q, Wang K. Pressure-Induced Structural and Optical Properties of Inorganic Halide Perovskite CsPbBr 3. J Phys Chem Lett 2017; 8:3752-3758. [PMID: 28742359 DOI: 10.1021/acs.jpclett.7b01577] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Perovskite photovoltaic materials are gaining sustained attention because of their excellent photovoltaic properties and extensive practical applicability. In this Letter, we discuss the changes in the structure and optical properties of CsPbBr3 under high pressure. As the pressure increased, the band gap initially began to red shift before 1.0 GPa followed by a continuous blue shift until the crystal was completely amorphized. An isostructural phase transition at 1.2 GPa was determined by high-pressure synchrotron X-ray and Raman spectroscopy. The result could be attributed to bond length shrinkage and PbBr6 octahedral distortion under high pressure. The amorphization of the crystal was due to the severe distortion and tilt of the PbBr6 octahedron, leading to broken long-range order. Changes in optical properties are closely related to the evolution of the crystal structure. Our discussion shows that high-pressure study can be used as an effective means to tune the structure and properties of all-inorganic halide perovskites.
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Affiliation(s)
- Long Zhang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University , Changchun 130012, China
| | - Qingxin Zeng
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University , Changchun 130012, China
| | - Kai Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University , Changchun 130012, China
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416
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He X, Qiu Y, Yang S. Fully-Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1700775. [PMID: 28639413 DOI: 10.1002/adma.201700775] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/08/2017] [Indexed: 05/24/2023]
Abstract
All-inorganic trihalide perovskite nanocrystals (NCs) are emerging as a new class of superstar semiconductors with excellent optoelectronic properties and great potential for a broad range of applications in lighting, lasing, photon detection, and photovoltaics. This article provides an up-to-date review on the developments of fully-inorganic trihalide perovskite NCs by emphasizing their controllable solution fabrication strategies, structural phase transformation, tunable optoelectronic properties, stability, as well as their photovoltaic and optoelectronic applications. Among the properties to be surveyed, particular focus is on the size-, shape-, and composition-dependent photoluminescence properties. Finally, by identifying new challenges, suggestions are provided for further research and potential development of this area.
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Affiliation(s)
- Xianghong He
- School of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, 213001, P. R. China
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Yongcai Qiu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Shihe Yang
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
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417
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Huang G, Wang C, Xu S, Zong S, Lu J, Wang Z, Lu C, Cui Y. Postsynthetic Doping of MnCl 2 Molecules into Preformed CsPbBr 3 Perovskite Nanocrystals via a Halide Exchange-Driven Cation Exchange. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1700095. [PMID: 28585275 DOI: 10.1002/adma.201700095] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 03/28/2017] [Indexed: 05/18/2023]
Abstract
Unlike widely used postsynthetic halide exchange for CsPbX3 (X is halide) perovskite nanocrystals (NCs), cation exchange of Pb is of a great challenge due to the rigid nature of the Pb cationic sublattice. Actually, cation exchange has more potential for rendering NCs with peculiar properties. Herein, a novel halide exchange-driven cation exchange (HEDCE) strategy is developed to prepare dually emitting Mn-doped CsPb(Cl/Br)3 NCs via postsynthetic replacement of partial Pb in preformed perovskite NCs. The basic idea for HEDCE is that the partial cation exchange of Pb by Mn has a large probability to occur as a concomitant result for opening the rigid halide octahedron structure around Pb during halide exchange. Compared to traditional ionic exchange, HEDCE is featured by proceeding of halide exchange and cation exchange at the same time and lattice site. The time and space requirements make only MnCl2 molecules (rather than mixture of Mn and Cl ions) capable of doping into perovskite NCs. This special molecular doping nature results in a series of unusual phenomenon, including long reaction time, core-shell structured mid states with triple emission bands, and dopant molecules composition-dependent doping process. As-prepared dual-emitting Mn-doped CsPb(Cl/Br)3 NCs are available for ratiometric temperature sensing.
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Affiliation(s)
- Guangguang Huang
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Chunlei Wang
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Shuhong Xu
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Shenfei Zong
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Ju Lu
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Zhuyuan Wang
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Changgui Lu
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
| | - Yiping Cui
- Advanced Photonics Center, Southeast University, Nanjing, 210096, P. R. China
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418
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Ling Y, Tan L, Wang X, Zhou Y, Xin Y, Ma B, Hanson K, Gao H. Composite Perovskites of Cesium Lead Bromide for Optimized Photoluminescence. J Phys Chem Lett 2017; 8:3266-3271. [PMID: 28677389 DOI: 10.1021/acs.jpclett.7b01302] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The halide perovskite CsPbBr3 has shown its promise for green light-emitting diodes. The optimal conditions of photoluminescence and the underlying photophysics, however, remain controversial. To address the inconsistency seen in the previous reports and to offer high-quality luminescent materials that can be readily integrated into functional devices with layered architecture, we created thin films of CsPbBr3/Cs4PbBr6 composites based on a dual-source vapor-deposition method. With the capability of tuning the material composition in a broad range, CsPbBr3 is identified as the only light emitter in the composites. Interestingly, the presence of the photoluminescence-inactive Cs4PbBr6 can significantly enhance the light emitting efficiency of the composites. The unique negative thermal quenching observed near the liquid nitrogen temperature indicates that a type of shallow state generated at the CsPbBr3/Cs4PbBr6 interfaces is responsible for the enhancement of photoluminescence.
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Affiliation(s)
- Yichuan Ling
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Lei Tan
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Xi Wang
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Yan Zhou
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Yan Xin
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Biwu Ma
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Kenneth Hanson
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
| | - Hanwei Gao
- Department of Physics, ‡Department of Chemistry and Biochemistry, §Department of Chemical and Biomedical Engineering, ∥National High Magnetic Field Laboratory, and ⊥Materials Science Program, Florida State University , Tallahassee, Florida 32306, United States
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419
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Xiao G, Cao Y, Qi G, Wang L, Liu C, Ma Z, Yang X, Sui Y, Zheng W, Zou B. Pressure Effects on Structure and Optical Properties in Cesium Lead Bromide Perovskite Nanocrystals. J Am Chem Soc 2017; 139:10087-10094. [PMID: 28682634 DOI: 10.1021/jacs.7b05260] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Metal halide perovskites (MHPs) are gaining increasing interest because of their extraordinary performance in optoelectronic devices and solar cells. However, developing an effective strategy for achieving the band-gap engineering of MHPs that will satisfy the practical applications remains a great challenge. In this study, high pressure is introduced to tailor the optical and structural properties of MHP-based cesium lead bromide nanocrystals (CsPbBr3 NCs), which exhibit excellent thermodynamic stability. Both the pressure-dependent steady-state photoluminescence and absorption spectra experience a stark discontinuity at ∼1.2 GPa, where an isostructural phase transformation regarding the Pbnm space group occurs. The physical origin points to the repulsive force impact due to the overlap between the valence electron charge clouds of neighboring layers. Simultaneous band-gap narrowing and carrier-lifetime prolongation of CsPbBr3 trihalide perovskite NCs were also achieved as expected, which facilitates the broader solar spectrum absorption for photovoltaic applications. Note that the values of the phase change interval and band-gap red-shift of CsPbBr3 nanowires are between those for CsPbBr3 nanocubes and the corresponding bulk counterparts, which results from the unique geometrical morphology effect. First-principles calculations unravel that the band-gap engineering is governed by orbital interactions within the inorganic Pb-Br frame through structural modification. Changes of band structures are attributed to the synergistic effect of pressure-induced modulations of the Br-Pb bond length and Pb-Br-Pb bond angle for the PbBr6 octahedral framework. Furthermore, the significant distortion of the lead-bromide octahedron to accommodate the Jahn-Teller effect at much higher pressure would eventually lead to a direct to indirect band-gap electronic transition. This study enables high pressure as a robust tool to control the structure and band gap of CsPbBr3 NCs, thus providing insight into the microscopic physiochemical mechanism of these compressed MHP nanosystems.
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Affiliation(s)
- Guanjun Xiao
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Ye Cao
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Guangyu Qi
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Lingrui Wang
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Chuang Liu
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Zhiwei Ma
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Xinyi Yang
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Yongming Sui
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Weitao Zheng
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, College of Materials Science and Engineering, Jilin University , Changchun 130012, People's Republic of China
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420
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Santomauro FG, Grilj J, Mewes L, Nedelcu G, Yakunin S, Rossi T, Capano G, Al Haddad A, Budarz J, Kinschel D, Ferreira DS, Rossi G, Gutierrez Tovar M, Grolimund D, Samson V, Nachtegaal M, Smolentsev G, Kovalenko MV, Chergui M. Localized holes and delocalized electrons in photoexcited inorganic perovskites: Watching each atomic actor by picosecond X-ray absorption spectroscopy. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:044002. [PMID: 28083541 PMCID: PMC5178717 DOI: 10.1063/1.4971999] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 11/11/2016] [Indexed: 05/07/2023]
Abstract
We report on an element-selective study of the fate of charge carriers in photoexcited inorganic CsPbBr3 and CsPb(ClBr)3 perovskite nanocrystals in toluene solutions using time-resolved X-ray absorption spectroscopy with 80 ps time resolution. Probing the Br K-edge, the Pb L3-edge, and the Cs L2-edge, we find that holes in the valence band are localized at Br atoms, forming small polarons, while electrons appear as delocalized in the conduction band. No signature of either electronic or structural changes is observed at the Cs L2-edge. The results at the Br and Pb edges suggest the existence of a weakly localized exciton, while the absence of signatures at the Cs edge indicates that the Cs+ cation plays no role in the charge transport, at least beyond 80 ps. This first, time-resolved element-specific study of perovskites helps understand the rather modest charge carrier mobilities in these materials.
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Affiliation(s)
- Fabio G Santomauro
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Jakob Grilj
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Lars Mewes
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | | | | | - Thomas Rossi
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Gloria Capano
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - André Al Haddad
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - James Budarz
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Dominik Kinschel
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | | | - Giacomo Rossi
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Mario Gutierrez Tovar
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | | | | | | | | | | | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
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421
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Wang Y, Zhu Y, Huang J, Cai J, Zhu J, Yang X, Shen J, Li C. Perovskite quantum dots encapsulated in electrospun fiber membranes as multifunctional supersensitive sensors for biomolecules, metal ions and pH. NANOSCALE HORIZONS 2017; 2:225-232. [PMID: 32260644 DOI: 10.1039/c7nh00057j] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
CsPbBr3 perovskite quantum dots (CPBQDs) have exhibited excellent optical properties, which implies their potential as an appealing candidate for fluorescence resonance energy transfer (FRET) based detection. In this work, in order to enhance the subsurface concentration of CPBQDs, which is important for the efficiency of FRET detection, a nanoscale polymethyl methacrylate (PMMA) fiber membrane (d≈ 400 nm) encapsulated with CPBQDs (CPBQDs/PMMA FM) is fabricated using an electrospinning method. The CPBQD/PMMA FM possesses comparable optical properties to CPBQDs, high quantum yields (88%) and a narrow half-peak width (∼14 nm). The sensing of trypsin is realized via the cleavage of peptide CF6 (Cys-Pro-Arg-Gly-R6G) and an extremely low detection limit of 0.1 μg mL-1 has been reached. Besides, owing to the high efficiency FRET process between the CPBQD/PMMA FM and cyclam-Cu2+, an unprecedented detection limit of Cu2+ has been pushed to 10-15 M. Furthermore, the pH value can be confirmed by the membrane in 10 ppb hydrazide R6G ethanol solution. The excellent optical characteristics of CPBQDs, high CPBQD subsurface concentration of the CPBQD/PMMA FM and robust durability of the PMMA coating all contribute to the outstanding sensitivity and stable detection performance of the CPBQD/PMMA FM.
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Affiliation(s)
- Yuanwei Wang
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
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422
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Hou J, Cao S, Wu Y, Gao Z, Liang F, Sun Y, Lin Z, Sun L. Inorganic Colloidal Perovskite Quantum Dots for Robust Solar CO
2
Reduction. Chemistry 2017; 23:9481-9485. [DOI: 10.1002/chem.201702237] [Citation(s) in RCA: 171] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Jungang Hou
- State Key Laboratory of Fine ChemicalsInstitute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology (DUT) Dalian 116024 P. R. China
| | - Shuyan Cao
- State Key Laboratory of Fine ChemicalsInstitute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology (DUT) Dalian 116024 P. R. China
| | - Yunzhen Wu
- State Key Laboratory of Fine ChemicalsInstitute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology (DUT) Dalian 116024 P. R. China
| | - Zhanming Gao
- State Key Laboratory of Fine ChemicalsInstitute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology (DUT) Dalian 116024 P. R. China
| | - Fei Liang
- Beijing Centre for Crystal Research and DevelopmentTechnical Institute of Physics and ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
| | - Yiqing Sun
- State Key Laboratory of Fine ChemicalsInstitute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology (DUT) Dalian 116024 P. R. China
| | - Zheshuai Lin
- Beijing Centre for Crystal Research and DevelopmentTechnical Institute of Physics and ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
| | - Licheng Sun
- State Key Laboratory of Fine ChemicalsInstitute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology (DUT) Dalian 116024 P. R. China
- Department of ChemistryKTH Royal Institute of Technology 10044 Stockholm Sweden
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423
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Li Z, Kong L, Huang S, Li L. Highly Luminescent and Ultrastable CsPbBr3
Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703264] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhichun Li
- School of Environmental Science and Engineering; Shanghai Jiao Tong University; Shanghai 200240 China
| | - Long Kong
- School of Environmental Science and Engineering; Shanghai Jiao Tong University; Shanghai 200240 China
| | - Shouqiang Huang
- School of Environmental Science and Engineering; Shanghai Jiao Tong University; Shanghai 200240 China
| | - Liang Li
- School of Environmental Science and Engineering; Shanghai Jiao Tong University; Shanghai 200240 China
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424
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Li Z, Kong L, Huang S, Li L. Highly Luminescent and Ultrastable CsPbBr 3 Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith. Angew Chem Int Ed Engl 2017; 56:8134-8138. [PMID: 28544211 DOI: 10.1002/anie.201703264] [Citation(s) in RCA: 170] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 05/08/2017] [Indexed: 11/12/2022]
Abstract
We successfully prepared QDs incorporated into a silica/alumina monolith (QDs-SAM) by a simple sol-gel reaction of an Al-Si single precursor with CsPbBr3 QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90 %, and good photostability under strong illumination of blue light for 300 h. We show that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr3 QDs from surface damages during the sol-gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr3 QDs but also prevented the aggregation of QDs and made the monolith transparent. The CsPbBr3 QDs-SAM in powder form was easily mixed into the resins and applied as color-converting layer with curing on blue light-emitting diodes (LED). The material showed a high luminous efficacy of 80 lm W-1 and a narrow emission with a full width at half maximum (FWHM) of 25 nm.
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Affiliation(s)
- Zhichun Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Long Kong
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Shouqiang Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Liang Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
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425
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Lorenzon M, Sortino L, Akkerman Q, Accornero S, Pedrini J, Prato M, Pinchetti V, Meinardi F, Manna L, Brovelli S. Role of Nonradiative Defects and Environmental Oxygen on Exciton Recombination Processes in CsPbBr 3 Perovskite Nanocrystals. NANO LETTERS 2017; 17:3844-3853. [PMID: 28480698 PMCID: PMC6557541 DOI: 10.1021/acs.nanolett.7b01253] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/03/2017] [Indexed: 05/20/2023]
Abstract
Lead halide perovskite nanocrystals (NCs) are emerging as optically active materials for solution-processed optoelectronic devices. Despite the technological relevance of tracing rational guidelines for optimizing their performances and stability beyond their intrinsic resilience to structural imperfections, no in-depth study of the role of selective carrier trapping and environmental conditions on their exciton dynamics has been reported to date. Here we conduct spectro-electrochemical (SEC) experiments, side-by-side to oxygen sensing measurements on CsPbBr3 NCs for the first time. We show that the application of EC potentials controls the emission intensity by altering the occupancy of defect states without degrading the NCs. Reductive potentials lead to strong (60%) emission quenching by trapping of photogenerated holes, whereas the concomitant suppression of electron trapping is nearly inconsequential to the emission efficiency. Consistently, oxidizing conditions result in minor (5%) brightening due to suppressed hole trapping, confirming that electron traps play a minor role in nonradiative decay. This behavior is rationalized through a model that links the occupancy of trap sites with the position of the NC Fermi level controlled by the EC potential. Photoluminescence measurements in controlled atmosphere reveal strong quenching by collisional interactions with O2, which is in contrast to the photobrightening effect observed in films and single crystals. This indicates that O2 acts as a scavenger of photoexcited electrons without mediation by structural defects and, together with the asymmetrical SEC response, suggests that electron-rich defects are likely less abundant in nanostructured perovskites than in the bulk, leading to an emission response dominated by direct interaction with the environment.
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Affiliation(s)
- Monica Lorenzon
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Luca Sortino
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Quinten Akkerman
- Nanochemistry Department and Materials Characterization Facility, Istituto Italiano di Tecnologia, via Morego 30, IT-16163 Genova, Italy
| | - Sara Accornero
- Nanochemistry Department and Materials Characterization Facility, Istituto Italiano di Tecnologia, via Morego 30, IT-16163 Genova, Italy
| | - Jacopo Pedrini
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Mirko Prato
- Nanochemistry Department and Materials Characterization Facility, Istituto Italiano di Tecnologia, via Morego 30, IT-16163 Genova, Italy
| | - Valerio Pinchetti
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Francesco Meinardi
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Liberato Manna
- Nanochemistry Department and Materials Characterization Facility, Istituto Italiano di Tecnologia, via Morego 30, IT-16163 Genova, Italy
| | - Sergio Brovelli
- Dipartimento
di Scienza dei Materiali, Università
degli Studi di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
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426
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Jing Q, Zhang M, Huang X, Ren X, Wang P, Lu Z. Surface passivation of mixed-halide perovskite CsPb(Br xI 1-x) 3 nanocrystals by selective etching for improved stability. NANOSCALE 2017; 9:7391-7396. [PMID: 28405658 DOI: 10.1039/c7nr01287j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In recent years, there has been an unprecedented rise in the research of halide perovskites because of their important optoelectronic applications, including photovoltaic cells, light-emitting diodes, photodetectors and lasers. The most pressing question concerns the stability of these materials. Here faster degradation and PL quenching are observed at higher iodine content for mixed-halide perovskite CsPb(BrxI1-x)3 nanocrystals, and a simple yet effective method is reported to significantly enhance their stability. After selective etching with acetone, surface iodine is partially etched away to form a bromine-rich surface passivation layer on mixed-halide perovskite nanocrystals. This passivation layer remarkably stabilizes the nanocrystals, making their PL intensity improved by almost three orders of magnitude. It is expected that a similar passivation layer can also be applied to various other kinds of perovskite materials with poor stability issues.
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Affiliation(s)
- Qiang Jing
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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427
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Lu J, Sheng X, Tong G, Yu Z, Sun X, Yu L, Xu X, Wang J, Xu J, Shi Y, Chen K. Ultrafast Solar-Blind Ultraviolet Detection by Inorganic Perovskite CsPbX 3 Quantum Dots Radial Junction Architecture. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1700400. [PMID: 28370588 DOI: 10.1002/adma.201700400] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 02/16/2017] [Indexed: 06/07/2023]
Abstract
Inorganic CsPbX3 (X = Cl, Br, I, or hybrid among them) perovskite quantum dots (IPQDs) are promising building blocks for exploring high performance optoelectronic applications. In this work, the authors report a new hybrid structure that marries CsPbX3 IPQDs to silicon nanowires (SiNWs) radial junction structures to achieve ultrafast and highly sensitive ultraviolet (UV) detection in solar-blind spectrum. A compact and uniform deployment of CsPbX3 IPQDs upon the sidewall of low-reflective 3D radial junctions enables a strong light field excitation and efficient down-conversion of the ultraviolet incidences, which are directly tailored into emission bands optimized for a rapid photodetection in surrounding ultrathin radial p-i-n junctions. A fast solar-blind UV detection has been demonstrated in this hybrid IPQD-NW detectors, with rise/fall response time scales of 0.48/1.03 ms and a high responsivity of 54 mA W-1 @200 nm (or 32 mA W-1 @270 nm), without the need of any external power supply. These results pave the way toward large area manufacturing of high performance Si-based perovskite UV detectors in a scalable and low-cost procedure.
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Affiliation(s)
- Jiawen Lu
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Xuexi Sheng
- Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210046, P. R. China
| | - Guoqing Tong
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Zhongwei Yu
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Xiaolin Sun
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Linwei Yu
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Xiangxing Xu
- Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210046, P. R. China
| | - Junzhuan Wang
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Jun Xu
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Yi Shi
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Kunji Chen
- National Laboratory of Solid State Microstructures, School of Electronics Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
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428
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Chiba T, Hoshi K, Pu YJ, Takeda Y, Hayashi Y, Ohisa S, Kawata S, Kido J. High-Efficiency Perovskite Quantum-Dot Light-Emitting Devices by Effective Washing Process and Interfacial Energy Level Alignment. ACS APPLIED MATERIALS & INTERFACES 2017; 9:18054-18060. [PMID: 28485139 DOI: 10.1021/acsami.7b03382] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
All inorganic perovskites quantum dots (PeQDs) have attracted much attention for used in thin film display applications and solid-state lighting applications, owing to their narrow band emission with high photoluminescence quantum yields (PLQYs), color tunability, and solution processability. Here, we fabricated low-driving-voltage and high-efficiency CsPbBr3 PeQDs light-emitting devices (PeQD-LEDs) using a PeQDs washing process with an ester solvent containing butyl acetate (AcOBu) to remove excess ligands from the PeQDs. The CsPbBr3 PeQDs film washed with AcOBu exhibited a PLQY of 42%, and a narrow PL emission with a full width at half-maximum of 19 nm. We also demonstrated energy level alignment of the PeQD-LED in order to achieve effective hole injection into PeQDs from the adjacent hole injection layer. The PeQD-LED with AcOBu-washed PeQDs exhibited a maximum power efficiency of 31.7 lm W-1 and EQE of 8.73%. Control of the interfacial PeQDs through ligand removal and energy level alignment in the device structure are promising methods for obtaining high PLQYs in film state and high device efficiency.
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Affiliation(s)
- Takayuki Chiba
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Keigo Hoshi
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Yong-Jin Pu
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Yuya Takeda
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Yukihiro Hayashi
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Satoru Ohisa
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - So Kawata
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Junji Kido
- Graduate School of Organic Materials Science, Frontier Center for Organic Materials, Yamagata University , 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
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429
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Chen J, Žídek K, Chábera P, Liu D, Cheng P, Nuuttila L, Al-Marri MJ, Lehtivuori H, Messing ME, Han K, Zheng K, Pullerits T. Size- and Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr 3 Perovskite Quantum Dots. J Phys Chem Lett 2017; 8:2316-2321. [PMID: 28480702 DOI: 10.1021/acs.jpclett.7b00613] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr3 QDs have also been demonstrated as stable two-photon-pumped lasing medium. However, the reported two photon absorption (TPA) cross sections for these QDs differ by an order of magnitude. Here we present an in-depth study of the TPA properties of CsPbBr3 QDs with mean size ranging from 4.6 to 11.4 nm. By using femtosecond transient absorption (TA) spectroscopy we found that TPA cross section is proportional to the linear one photon absorption. The TPA cross section follows a power law dependence on QDs size with exponent 3.3 ± 0.2. The empirically obtained power-law dependence suggests that the TPA process through a virtual state populates exciton band states. The revealed power-law dependence and the understanding of TPA process are important for developing high performance nonlinear optical devices based on CsPbBr3 nanocrystals.
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Affiliation(s)
- Junsheng Chen
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, China
| | - Karel Žídek
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- Regional Centre for Special Optics and Optoelectronic Systems (TOPTEC), Institute of Plasma Physics, Academy of Sciences of the Czech Republic , Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
| | - Pavel Chábera
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
| | - Dongzhou Liu
- College of Science, Agricultural University of Hebei , Lingyusi 289, 071001, Baoding, Hebei China
- College of Physics Science & Technology, Hebei University , East of Wusi 180, 071002, Baoding, Hebei China
| | - Pengfei Cheng
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, China
| | - Lauri Nuuttila
- University of Jyväskylä , Department of Physics, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Mohammed J Al-Marri
- Gas Processing Center, College of Engineering, Qatar University , P.O. Box 2713, Doha, Qatar
| | - Heli Lehtivuori
- University of Jyväskylä , Department of Physics, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Maria E Messing
- Solid State Physics and NanoLund, Lund University , Box 118, 22100 Lund, Sweden
| | - Keli Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, China
| | - Kaibo Zheng
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
- Gas Processing Center, College of Engineering, Qatar University , P.O. Box 2713, Doha, Qatar
| | - Tõnu Pullerits
- Department of Chemical Physics and NanoLund, Lund University , P.O. Box 124, 22100 Lund, Sweden
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430
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Fu M, Tamarat P, Huang H, Even J, Rogach AL, Lounis B. Neutral and Charged Exciton Fine Structure in Single Lead Halide Perovskite Nanocrystals Revealed by Magneto-optical Spectroscopy. NANO LETTERS 2017; 17:2895-2901. [PMID: 28240910 DOI: 10.1021/acs.nanolett.7b00064] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Revealing the crystal structure of lead halide perovskite nanocrystals is essential for the optimization of stability of these emerging materials in applications such as solar cells, photodetectors, and light-emitting devices. We use magneto-photoluminescence spectroscopy of individual perovskite CsPbBr3 nanocrystals as a unique tool to determine their crystal structure, which imprints distinct signatures in the excitonic sublevels of charge complexes at low temperatures. At zero magnetic field, the identification of two classes of photoluminescence spectra, displaying either two or three sublevels in their exciton fine structure, shows evidence for the existence of two crystalline structures, namely tetragonal D4h and orthorhombic D2h phases. Magnetic field shifts, splitting, and coupling of the sublevels provide a determination of the diamagnetic coefficient and valuable information on the exciton g-factor and its anisotropic character. Moreover, this spectroscopic study reveals the optical properties of charged excitons and allows the extraction of the electron and hole g-factors for perovskite systems.
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Affiliation(s)
- Ming Fu
- LP2N, Université de Bordeaux , Talence F-33405, France
- LP2N, Institut d'Optique and CNRS , Talence F-33405, France
| | - Philippe Tamarat
- LP2N, Université de Bordeaux , Talence F-33405, France
- LP2N, Institut d'Optique and CNRS , Talence F-33405, France
| | - He Huang
- Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong , 83 Tat Chee Avenue Kowloon, Hong Kong, SAR China
| | - Jacky Even
- Fonctions Optiques pour les Technologies de l'Information, FOTON UMR 6082, CNRS, INSA de Rennes , 35708 Rennes, France
| | - Andrey L Rogach
- Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City University of Hong Kong , 83 Tat Chee Avenue Kowloon, Hong Kong, SAR China
| | - Brahim Lounis
- LP2N, Université de Bordeaux , Talence F-33405, France
- LP2N, Institut d'Optique and CNRS , Talence F-33405, France
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431
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Medishetty R, Nalla V, Nemec L, Henke S, Mayer D, Sun H, Reuter K, Fischer RA. A New Class of Lasing Materials: Intrinsic Stimulated Emission from Nonlinear Optically Active Metal-Organic Frameworks. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1605637. [PMID: 28218491 DOI: 10.1002/adma.201605637] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/26/2016] [Indexed: 06/06/2023]
Abstract
Blue-color stimulated emission with low threshold power is observed from In- and Zn-MOFs, which feature a highly fluorescent chromophore densely packed and rigidly linked to the metal-ion centers in the solid state. The density-of-states and transition dipole moments are calculated and the stimulated emission phenomenon is correlated with these properties.
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Affiliation(s)
- Raghavender Medishetty
- Chair of Inorganic and Metal-Organic Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching, D-85748, Germany
| | - Venkatram Nalla
- Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Lydia Nemec
- Chair of Theoretical Chemistry, Technical University Munich, Lichtenbergstraße 4, D-85748, Garching, Germany
| | - Sebastian Henke
- Department of Chemistry and Chemical Biology, Technische Universität Dortmund, Otto-Hahn-Str. 6, D-44227, Dortmund, Germany
| | - David Mayer
- Chair of Inorganic and Metal-Organic Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching, D-85748, Germany
| | - Handong Sun
- Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Karsten Reuter
- Chair of Theoretical Chemistry, Technical University Munich, Lichtenbergstraße 4, D-85748, Garching, Germany
| | - Roland A Fischer
- Chair of Inorganic and Metal-Organic Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching, D-85748, Germany
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432
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Wang Y, Ta VD, Leck KS, Tan BHI, Wang Z, He T, Ohl CD, Demir HV, Sun H. Robust Whispering-Gallery-Mode Microbubble Lasers from Colloidal Quantum Dots. NANO LETTERS 2017; 17:2640-2646. [PMID: 28288279 DOI: 10.1021/acs.nanolett.7b00447] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Microlasers hold great promise for the development of photonics and optoelectronics. Among the discovered optical gain materials, colloidal quantum dots (CQDs) have been recognized as the most appealing candidate due to the facile emission tunability and solution processability. However, to date, it is still challenging to develop CQD-based microlasers with low cost yet high performance. Moreover, the poor long-term stability of CQDs remains to be the most critical issue, which may block their laser aspirations. Herein, we developed a unique but generic approach to forming a novel type of a whispering-gallery-mode (WGM) microbubble laser from the hybrid CQD/poly(methyl methacrylate) (PMMA) nanocomposites. The formation mechanism of the microbubbles was unraveled by recording the drying process of the nanocomposite droplets. Interestingly, these microbubbles naturally serve as the high-quality WGM laser resonators. By simply changing the CQDs, the lasing emission can be tuned across the whole visible spectral range. Importantly, these microbubble lasers exhibit unprecedented long-term stability (over one year), sufficient for practical applications. As a proof-of-concept, the potential of water vapor sensing was demonstrated. Our results represent a significant advance in microlasers based on the advantageous CQDs and may offer new possibilities for photonics and optoelectronics.
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Affiliation(s)
| | - Van Duong Ta
- Department of Physics, King's College London , Strand, London, WC2R 2LS, United Kingdom
| | - Kheng Swee Leck
- School of Electrical and Electronic Engineering, Luminous! Center of Excellence for Semiconductor Lighting and Displays, Nanyang Technological University , Nanyang Avenue, Singapore 639798, Singapore
| | | | | | - Tingchao He
- College of Physics Science and Technology, Shenzhen University , Shenzhen 518060, China
| | | | - Hilmi Volkan Demir
- School of Electrical and Electronic Engineering, Luminous! Center of Excellence for Semiconductor Lighting and Displays, Nanyang Technological University , Nanyang Avenue, Singapore 639798, Singapore
- Department of Electrical and Electronics Engineering, Department of Physics, and UNAM-National Nanotechnology Research Center, Bilkent University , Bilkent, Ankara 06800, Turkey
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433
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Zhu ZY, Yang QQ, Gao LF, Zhang L, Shi AY, Sun CL, Wang Q, Zhang HL. Solvent-Free Mechanosynthesis of Composition-Tunable Cesium Lead Halide Perovskite Quantum Dots. J Phys Chem Lett 2017; 8:1610-1614. [PMID: 28326786 DOI: 10.1021/acs.jpclett.7b00431] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A facile and green mechanosynthesis strategy free of solvent and high reaction temperature was developed to fabricate highly emissive cesium lead halide perovskite (CsPbX3) quantum dots (QDs). Their composition can be adjusted conveniently simply through mechanically milling/grinding stoichiometric combinations of raw reagents, thereby introducing a broad luminescence tunability of the product with adjustable wavelength, line width, and photoluminescence quantum yield. Desired CsPbX3 QDs "library" can thus be readily constructed in a way like assembling Lego building blocks. Hence, the method offered new avenues in the preparation of multicomponent cocrystals, adding one appealing apparatus to the tool box of perovskite-type QDs synthesis. Intriguingly, photoinduced dynamic study revealed the hole-transfer process of the as-prepared QDs toward electron donors, indicative of their potential in charge-transfer-based applications such as light-harvesting devices and photocatalysis.
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Affiliation(s)
- Zhi-Yuan Zhu
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - Qi-Qi Yang
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - Lin-Feng Gao
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - Lei Zhang
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - An-Ye Shi
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - Chun-Lin Sun
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - Qiang Wang
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
| | - Hao-Li Zhang
- State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University , Lanzhou 730000, China
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434
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Yarita N, Tahara H, Ihara T, Kawawaki T, Sato R, Saruyama M, Teranishi T, Kanemitsu Y. Dynamics of Charged Excitons and Biexcitons in CsPbBr 3 Perovskite Nanocrystals Revealed by Femtosecond Transient-Absorption and Single-Dot Luminescence Spectroscopy. J Phys Chem Lett 2017; 8:1413-1418. [PMID: 28286951 DOI: 10.1021/acs.jpclett.7b00326] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Metal-halide perovskite nanocrystals (NCs) are promising photonic materials for use in solar cells, light-emitting diodes, and lasers. The optoelectronic properties of these devices are determined by the excitons and exciton complexes confined in their NCs. In this study, we determined the relaxation dynamics of charged excitons and biexcitons in CsPbBr3 NCs using femtosecond transient-absorption (TA), time-resolved photoluminescence (PL), and single-dot second-order photon correlation spectroscopy. Decay times of ∼40 and ∼200 ps were obtained from the TA and PL decay curves for biexcitons and charged excitons, respectively, in NCs with an average edge length of 7.7 nm. The existence of charged excitons even under weak photoexcitation was confirmed by the second-order photon correlation measurements. We found that charged excitons play a dominant role in luminescence processes of CsPbBr3 NCs. Combining different spectroscopic techniques enabled us to clarify the dynamical behaviors of excitons, charged excitons, and biexcitons.
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Affiliation(s)
- Naoki Yarita
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Hirokazu Tahara
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Toshiyuki Ihara
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Tokuhisa Kawawaki
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Ryota Sato
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Masaki Saruyama
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Toshiharu Teranishi
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
| | - Yoshihiko Kanemitsu
- Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan
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435
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Yang D, Cheng X, Liu Y, Shen C, Xu Z, Zheng X, Jiang T. Dielectric properties of a CsPbBr 3 quantum dot solution in the terahertz region. APPLIED OPTICS 2017; 56:2878-2885. [PMID: 28375256 DOI: 10.1364/ao.56.002878] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In recent years, CsPbBr3 quantum dots (QDs) have attracted much attention due to their bright prospects in solar cell studies. Dielectric properties are important for the fabrication of optoelectronic devices. Here, the dielectric properties of a CsPbBr3 QD solution are investigated between 0.1 and 2.0 THz by terahertz time-domain spectroscopy. The measured frequency-dependent transmitted ratio is found to decrease from 0.96 to 0.80 in this range. By comparing different concentrations of the QD solution, the frequency-averaged absorption is linearly increased with the increase in QD concentration. After that, the frequency-dependent dielectric constant, including the complex refractive index, complex dielectric constant, and conductivity, is extracted by Fourier transform of the time-domain spectrum. An effective medium approach method is adopted to extract the complex dielectric constant of a CsPbBr3 QD inclusion, and a slight peak around 0.4 THz is found in the imaginary part of the dielectric constant. The result of Drude-Lorentz fitting shows that the phonon plays a dominant role in the dielectric properties of a CsPbBr3 QD solution. Moreover, the THz response of a CsPbBr3 QD is found to be unchanged when the test is conducted under illumination. We attribute this phenomenon to the discrete energy level of excitons in CsPbBr3 QDs due to quantum confinement, and design a comparative experiment to validate it. This study is significant for its deeper insight into the dielectric properties of CsPbBr3 QDs, and thus is helpful through its applications in optoelectronics.
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436
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Chen S, Zhang C, Lee J, Han J, Nurmikko A. High-Q, Low-Threshold Monolithic Perovskite Thin-Film Vertical-Cavity Lasers. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1604781. [PMID: 28211117 DOI: 10.1002/adma.201604781] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 12/23/2016] [Indexed: 05/20/2023]
Abstract
A vertical-cavity surface-emitting perovskite laser is achieved using a microcavity configuration where CH3 NH3 PbI3 thin solid films are embedded within a custom GaN-based high-quality (Q-factor) resonator. This single-mode perovskite laser reaches a low threshold (≈7.6 µJ cm-2 ) at room temperature and emits spatially coherent Gaussian laser beams. The devices allow direct access to the study of perovskite gain dynamics and material robustness.
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Affiliation(s)
- Songtao Chen
- School of Engineering, Brown University, Providence, RI, 02912, USA
| | - Cheng Zhang
- Department of Electrical Engineering, Yale University, New Haven, CT, 06511, USA
| | - Joonhee Lee
- School of Engineering, Brown University, Providence, RI, 02912, USA
| | - Jung Han
- Department of Electrical Engineering, Yale University, New Haven, CT, 06511, USA
| | - Arto Nurmikko
- School of Engineering and Department of Physics, Brown University, Providence, RI, 02912, USA
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437
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Dai X, Deng Y, Peng X, Jin Y. Quantum-Dot Light-Emitting Diodes for Large-Area Displays: Towards the Dawn of Commercialization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1607022. [PMID: 28256780 DOI: 10.1002/adma.201607022] [Citation(s) in RCA: 252] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 02/02/2017] [Indexed: 05/21/2023]
Abstract
Quantum dots are a unique class of emitters with size-tunable emission wavelengths, saturated emission colors, near-unity luminance efficiency, inherent photo- and thermal- stability and excellent solution processability. Quantum dots have been used as down-converters for back-lighting in liquid-crystal displays to improve color gamut, leading to the booming of quantum-dot televisions in consumer market. In the past few years, efficiency and lifetime of electroluminescence devices based on quantum dots achieved tremendous progress. These encouraging facts foreshadow the commercialization of quantum-dot light-emitting diodes (QLEDs), which promises an unprecedented generation of cost-effective, large-area, energy-saving, wide-color-gamut, ultra-thin and flexible displays. Here we provide a Progress Report, covering interdisciplinary aspects including material chemistry of quantum dots and charge-transporting layers, optimization and mechanism studies of prototype devices and processing techniques to produce large-area and high-resolution red-green-blue pixel arrays. We also identify a few key challenges facing the development of active-matrix QLED displays.
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Affiliation(s)
- Xingliang Dai
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Yunzhou Deng
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Xiaogang Peng
- Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Yizheng Jin
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China
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438
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Zhang N, Sun W, Rodrigues SP, Wang K, Gu Z, Wang S, Cai W, Xiao S, Song Q. Highly Reproducible Organometallic Halide Perovskite Microdevices based on Top-Down Lithography. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1606205. [PMID: 28195440 DOI: 10.1002/adma.201606205] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 12/02/2016] [Indexed: 05/23/2023]
Abstract
Highly reproducible organometallic-halide-perovskite-based devices are fabricated by a manufacturing process, which is demonstrated. Various shapes that are hard to synthesize directly are fabricated, and many unique properties are achieved.The fabrication procedure is utilized to create a photodetector and the detection sensitivity is significantly improved. The results will bring revolutionary advancement to the future of lead-halide-perovskite-based optoelectronic devices.
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Affiliation(s)
- Nan Zhang
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Wenzhao Sun
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Sean P Rodrigues
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Kaiyang Wang
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Zhiyuan Gu
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Shuai Wang
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Wenshan Cai
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Shumin Xiao
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Qinghai Song
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology, Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
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439
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Protesescu L, Yakunin S, Kumar S, Bär J, Bertolotti F, Masciocchi N, Guagliardi A, Grotevent M, Shorubalko I, Bodnarchuk MI, Shih CJ, Kovalenko MV. Dismantling the "Red Wall" of Colloidal Perovskites: Highly Luminescent Formamidinium and Formamidinium-Cesium Lead Iodide Nanocrystals. ACS NANO 2017; 11:3119-3134. [PMID: 28231432 PMCID: PMC5800405 DOI: 10.1021/acsnano.7b00116] [Citation(s) in RCA: 177] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 02/23/2017] [Indexed: 05/21/2023]
Abstract
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A = Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X = Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light-emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions. So far, red-emissive CsPbI3 NCs have been shown to suffer from a delayed phase transformation into a nonluminescent, wide-band-gap 1D polymorph, and MAPbI3 exhibits very limited chemical durability. In this work, we report a facile colloidal synthesis method for obtaining FAPbI3 and FA-doped CsPbI3 NCs that are uniform in size (10-15 nm) and nearly cubic in shape and exhibit drastically higher robustness than their MA- or Cs-only cousins with similar sizes and morphologies. Detailed structural analysis indicated that the FAPbI3 NCs had a cubic crystal structure, while the FA0.1Cs0.9PbI3 NCs had a 3D orthorhombic structure that was isostructural to the structure of CsPbBr3 NCs. Bright photoluminescence (PL) with high quantum yield (QY > 70%) spanning red (690 nm, FA0.1Cs0.9PbI3 NCs) and near-infrared (near-IR, ca. 780 nm, FAPbI3 NCs) regions was sustained for several months or more in both the colloidal state and in films. The peak PL wavelengths can be fine-tuned by using postsynthetic cation- and anion-exchange reactions. Amplified spontaneous emissions with low thresholds of 28 and 7.5 μJ cm-2 were obtained from the films deposited from FA0.1Cs0.9PbI3 and FAPbI3 NCs, respectively. Furthermore, light-emitting diodes with a high external quantum efficiency of 2.3% were obtained by using FAPbI3 NCs.
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Affiliation(s)
- Loredana Protesescu
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics and Laboratory for Reliability Science and
Technology, Empa−Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Sergii Yakunin
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics and Laboratory for Reliability Science and
Technology, Empa−Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Sudhir Kumar
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
| | - Janine Bär
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
| | - Federica Bertolotti
- Dipartimento
di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, Via Valleggio 11, I-22100 Como, Italy
| | - Norberto Masciocchi
- Dipartimento
di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, Via Valleggio 11, I-22100 Como, Italy
| | - Antonietta Guagliardi
- Dipartimento
di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, Via Valleggio 11, I-22100 Como, Italy
- Istituto
di Crystallografia and To.Sca.Lab, Consiglio
Nazionale delle Ricerche, Valleggio 11, I-22100 Como, Italy
| | - Matthias Grotevent
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics and Laboratory for Reliability Science and
Technology, Empa−Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Ivan Shorubalko
- Laboratory for Thin Films and Photovoltaics and Laboratory for Reliability Science and
Technology, Empa−Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Maryna I. Bodnarchuk
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics and Laboratory for Reliability Science and
Technology, Empa−Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Chih-Jen Shih
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
| | - Maksym V. Kovalenko
- Institute
of Inorganic Chemistry and Institute of Chemical and Bioengineering,
Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory for Thin Films and Photovoltaics and Laboratory for Reliability Science and
Technology, Empa−Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
- E-mail:
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440
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Protesescu L, Yakunin S, Kumar S, Bär J, Bertolotti F, Masciocchi N, Guagliardi A, Grotevent M, Shorubalko I, Bodnarchuk MI, Shih CJ, Kovalenko MV. Dismantling the "Red Wall" of Colloidal Perovskites: Highly Luminescent Formamidinium and Formamidinium-Cesium Lead Iodide Nanocrystals. ACS NANO 2017; 11:3119-3134. [PMID: 28231432 DOI: 10.1021/acsnano.7b00116/suppl_file/nn7b00116_si_001.pdf] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A = Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X = Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light-emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions. So far, red-emissive CsPbI3 NCs have been shown to suffer from a delayed phase transformation into a nonluminescent, wide-band-gap 1D polymorph, and MAPbI3 exhibits very limited chemical durability. In this work, we report a facile colloidal synthesis method for obtaining FAPbI3 and FA-doped CsPbI3 NCs that are uniform in size (10-15 nm) and nearly cubic in shape and exhibit drastically higher robustness than their MA- or Cs-only cousins with similar sizes and morphologies. Detailed structural analysis indicated that the FAPbI3 NCs had a cubic crystal structure, while the FA0.1Cs0.9PbI3 NCs had a 3D orthorhombic structure that was isostructural to the structure of CsPbBr3 NCs. Bright photoluminescence (PL) with high quantum yield (QY > 70%) spanning red (690 nm, FA0.1Cs0.9PbI3 NCs) and near-infrared (near-IR, ca. 780 nm, FAPbI3 NCs) regions was sustained for several months or more in both the colloidal state and in films. The peak PL wavelengths can be fine-tuned by using postsynthetic cation- and anion-exchange reactions. Amplified spontaneous emissions with low thresholds of 28 and 7.5 μJ cm-2 were obtained from the films deposited from FA0.1Cs0.9PbI3 and FAPbI3 NCs, respectively. Furthermore, light-emitting diodes with a high external quantum efficiency of 2.3% were obtained by using FAPbI3 NCs.
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Affiliation(s)
| | | | | | | | - Federica Bertolotti
- Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell'Insubria , Via Valleggio 11, I-22100 Como, Italy
| | - Norberto Masciocchi
- Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell'Insubria , Via Valleggio 11, I-22100 Como, Italy
| | - Antonietta Guagliardi
- Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell'Insubria , Via Valleggio 11, I-22100 Como, Italy
- Istituto di Crystallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche , Valleggio 11, I-22100 Como, Italy
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441
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Gao Y, Wang S, Huang C, Yi N, Wang K, Xiao S, Song Q. Room temperature three-photon pumped CH 3NH 3PbBr 3 perovskite microlasers. Sci Rep 2017; 7:45391. [PMID: 28350003 PMCID: PMC5368977 DOI: 10.1038/srep45391] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 02/27/2017] [Indexed: 12/20/2022] Open
Abstract
Hybrid lead halide perovskites have made great strides in next-generation light-harvesting and light emitting devices. Recently, they have also shown great potentials in nonlinear optical materials. Two-photon absorption and two-photon light emission have been thoroughly studied in past two years. However, the three-photon processes are rarely explored, especially for the laser emissions. Here we synthesized high quality CH3NH3PbBr3 perovskite microstructures with solution processed precipitation method and studied their optical properties. When the microstructures are pumped with intense 1240 nm lasers, we have observed clear optical limit effect and the band-to-band photoluminescence at 540 nm. By increasing the pumping density, whispering-gallery-mode based microlasers have been achieved from CH3NH3PbBr3 perovskite microplate and microrod for the first time. This work demonstrates the potentials of hybrid lead halide perovskites in nonlinear photonic devices.
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Affiliation(s)
- Yisheng Gao
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.,State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Shuai Wang
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.,State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Can Huang
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.,State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Ningbo Yi
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Kaiyang Wang
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.,State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Shumin Xiao
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.,Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China
| | - Qinghai Song
- State Key Laboratory on Tunable laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China.,Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China
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442
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Swarnkar A, Marshall AR, Sanehira EM, Chernomordik BD, Moore DT, Christians JA, Chakrabarti T, Luther JM. Quantum dot-induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics. Science 2017; 354:92-95. [PMID: 27846497 DOI: 10.1126/science.aag2700] [Citation(s) in RCA: 943] [Impact Index Per Article: 134.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 06/13/2016] [Accepted: 09/07/2016] [Indexed: 12/19/2022]
Abstract
We show nanoscale phase stabilization of CsPbI3 quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI3 is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbI3 (α-CsPbI3)-the variant with desirable band gap-is only stable at high temperatures. We describe the formation of α-CsPbI3 QD films that are phase-stable for months in ambient air. The films exhibit long-range electronic transport and were used to fabricate colloidal perovskite QD photovoltaic cells with an open-circuit voltage of 1.23 volts and efficiency of 10.77%. These devices also function as light-emitting diodes with low turn-on voltage and tunable emission.
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Affiliation(s)
- Abhishek Swarnkar
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.,Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, India
| | - Ashley R Marshall
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.,Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA
| | - Erin M Sanehira
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.,Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA
| | - Boris D Chernomordik
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA
| | - David T Moore
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA
| | - Jeffrey A Christians
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA
| | - Tamoghna Chakrabarti
- Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA
| | - Joseph M Luther
- Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.
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443
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Foster CW, Down MP, Zhang Y, Ji X, Rowley-Neale SJ, Smith GC, Kelly PJ, Banks CE. 3D Printed Graphene Based Energy Storage Devices. Sci Rep 2017; 7:42233. [PMID: 28256602 PMCID: PMC5361393 DOI: 10.1038/srep42233] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 01/06/2017] [Indexed: 12/12/2022] Open
Abstract
3D printing technology provides a unique platform for rapid prototyping of numerous applications due to its ability to produce low cost 3D printed platforms. Herein, a graphene-based polylactic acid filament (graphene/PLA) has been 3D printed to fabricate a range of 3D disc electrode (3DE) configurations using a conventional RepRap fused deposition moulding (FDM) 3D printer, which requires no further modification/ex-situ curing step. To provide proof-of-concept, these 3D printed electrode architectures are characterised both electrochemically and physicochemically and are advantageously applied as freestanding anodes within Li-ion batteries and as solid-state supercapacitors. These freestanding anodes neglect the requirement for a current collector, thus offering a simplistic and cheaper alternative to traditional Li-ion based setups. Additionally, the ability of these devices’ to electrochemically produce hydrogen via the hydrogen evolution reaction (HER) as an alternative to currently utilised platinum based electrodes (with in electrolysers) is also performed. The 3DE demonstrates an unexpectedly high catalytic activity towards the HER (−0.46 V vs. SCE) upon the 1000th cycle, such potential is the closest observed to the desired value of platinum at (−0.25 V vs. SCE). We subsequently suggest that 3D printing of graphene-based conductive filaments allows for the simple fabrication of energy storage devices with bespoke and conceptual designs to be realised.
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Affiliation(s)
- Christopher W Foster
- Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M15 GD, UK
| | - Michael P Down
- Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M15 GD, UK
| | - Yan Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Xiaobo Ji
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Samuel J Rowley-Neale
- Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M15 GD, UK
| | - Graham C Smith
- Faculty of Science and Engineering, Department of Natural Sciences, University of Chester, Thornton Science Park, Pool Lane, Ince, Chester CH2 4NU, UK
| | - Peter J Kelly
- Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M15 GD, UK
| | - Craig E Banks
- Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M15 GD, UK
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444
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Li X, Cao F, Yu D, Chen J, Sun Z, Shen Y, Zhu Y, Wang L, Wei Y, Wu Y, Zeng H. All Inorganic Halide Perovskites Nanosystem: Synthesis, Structural Features, Optical Properties and Optoelectronic Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1603996. [PMID: 28067991 DOI: 10.1002/smll.201603996] [Citation(s) in RCA: 229] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 12/05/2016] [Indexed: 05/22/2023]
Abstract
The recent success of organometallic halide perovskites (OHPs) in photovoltaic devices has triggered lots of corresponding research and many perovskite analogues have been developed to look for devices with comparable performance but better stability. Upon the preparation of all inorganic halide perovskite nanocrystals (IHP NCs), research activities have soared due to their better stability, ultrahigh photoluminescence quantum yield (PL QY), and composition dependent luminescence covering the whole visible region with narrow line-width. They are expected to be promising materials for next generation lighting and display, and many other applications. Within two years, a lot of interesting results have been observed. Here, the synthesis of IHPs is reviewed, and their progresses in optoelectronic devices and optical applications, such as light-emitting diodes (LEDs), photodetectors (PDs), solar cells (SCs), and lasing, is presented. Information and recent understanding of their crystal structures and morphology modulations are addressed. Finally, a brief outlook is given, highlighting the presently main problems and their possible solutions and future development directions.
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Affiliation(s)
- Xiaoming Li
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
- State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
| | - Fei Cao
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Dejian Yu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Jun Chen
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Zhiguo Sun
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Yalong Shen
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Ying Zhu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Lin Wang
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Yi Wei
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Ye Wu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Haibo Zeng
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
- State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
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445
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Huang S, Li Z, Wang B, Zhu N, Zhang C, Kong L, Zhang Q, Shan A, Li L. Morphology Evolution and Degradation of CsPbBr 3 Nanocrystals under Blue Light-Emitting Diode Illumination. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7249-7258. [PMID: 28181794 DOI: 10.1021/acsami.6b14423] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Under illumination of light-emitting diode (LED) or sunlight, the green color of all-inorganic CsPbBr3 perovskite nanocrystals (CPB-NCs) often quickly changes to yellow, followed by large photoluminescence (PL) loss. To figure out what is happening on CPB-NCs during the color change process, the morphology, structure, and PL evolutions are systematically investigated by varying the influence factors of illumination, moisture, oxygen, and temperature. We find that the yellow color is mainly originated from the large CPB crystals formed in the illumination process. With maximized isolation of oxygen for the sandwiched film or the uncovered film stored in nitrogen, the color change can be dramatically slowed down whether there is water vapor or not. Under dark condition, the PL emissions are not significantly influenced by the varied relative humidity (RH) levels and temperatures up to 60 °C. Under the precondition of oxygen or air, color change and PL loss become more obvious when increasing the illumination power or RH level, and the large-sized cubic CPB crystals are further evolved into the oval-shaped crystals. We confirm that oxygen is the crucial factor to drive the color change, which has the strong synergistic effect with the illumination and moisture for the degradation of the CPB film. Meanwhile, the surface decomposition and the increased charge trap states occurred in the formed large CPB crystals play important roles for the PL loss.
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Affiliation(s)
- Shouqiang Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Zhichun Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Bo Wang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Nanwen Zhu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Congyang Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Long Kong
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Qi Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Aidang Shan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
| | - Liang Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, 200240 Shanghai, China
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446
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Zhou H, Yuan S, Wang X, Xu T, Wang X, Li H, Zheng W, Fan P, Li Y, Sun L, Pan A. Vapor Growth and Tunable Lasing of Band Gap Engineered Cesium Lead Halide Perovskite Micro/Nanorods with Triangular Cross Section. ACS NANO 2017; 11:1189-1195. [PMID: 28035809 DOI: 10.1021/acsnano.6b07374] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Although great efforts have been devoted to the synthesis of halide perovskites nanostructures, vapor growth of high-quality one-dimensional cesium lead halide nanostructures for tunable nanoscale lasers is still a challenge. Here, we report the growth of high-quality all-inorganic cesium lead halide alloy perovskite micro/nanorods with complete composition tuning by vapor-phase deposition. The as-grown micro/nanorods are single-crystalline with a triangular cross section and show strong photoluminescence which can be tuned from 415 to 673 nm by varying the halide composition. Furthermore, these single-crystalline perovskite micro/nanorods themselves function as effective Fabry-Perot cavities for nanoscale lasers. We have realized room-temperature tunable lasing of cesium lead halide perovskite with low lasing thresholds (∼14.1 μJ cm-2) and high Q factors (∼3500).
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Affiliation(s)
- Hong Zhou
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Shuangping Yuan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Xiaoxia Wang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Tao Xu
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University , Nanjing 210096, P. R. China
| | - Xiao Wang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Honglai Li
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Weihao Zheng
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Peng Fan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Yunyun Li
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
| | - Litao Sun
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University , Nanjing 210096, P. R. China
| | - Anlian Pan
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, and School of Physics and Electronics, Hunan University , Changsha 410082, P. R. China
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447
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Li X, Yu D, Chen J, Wang Y, Cao F, Wei Y, Wu Y, Wang L, Zhu Y, Sun Z, Ji J, Shen Y, Sun H, Zeng H. Constructing Fast Carrier Tracks into Flexible Perovskite Photodetectors To Greatly Improve Responsivity. ACS NANO 2017; 11:2015-2023. [PMID: 28107628 DOI: 10.1021/acsnano.6b08194] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Intrinsically high mobility and large absorption coefficient endow inorganic halide perovskites (IHPs) with great promise for high-performance photodetectors (PDs), which, however, are being hindered by the low carrier extraction and transport efficiency of the solution assembled films. Here, we report on a general strategy to enhance the perovskite film conductivity that carbon nanotubes (CNTs) conductive nanonets are constructed from to provide fast carrier tracks. Resultantly, the CsPbBr3 nanosheet/CNT composite films exhibit both high light harvesting and high conductivity, such advantages are demonstrated by the high performances of corresponding planar PDs. Specifically, the highest external quantum efficiency (EQE) of 7488% and the highest responsivity of 31.1 A W-1 under a bias of 10 V among IHP PDs with planar structure are achieved, which are almost 125-fold over the previous best results. Besides, the efficient charge extraction and transport also remarkably contribute to the fast response speed where a rise time of 16 μs is achieved, which is also superior to state-of-the-art IHP PDs. Furthermore, the composite films exhibit impressive flexibility due to the ultrathin 2D and 1D structural characteristic of perovskites and CNTs. By deploying the PD as a point-like detector, we acquire clear images. The results indicate the promising potentials of the perovskite/CNT composites for solution and ambient condition processed flexible devices, and this strategy is general for all kinds of perovskite optoelectronic devices including photodetectors, phototransistors, and even LEDs.
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Affiliation(s)
- Xiaoming Li
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
- State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, China
| | - Dejian Yu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Jun Chen
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Yue Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore
| | - Fei Cao
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Yi Wei
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Ye Wu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Lin Wang
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Ying Zhu
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Zhiguo Sun
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Jianping Ji
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Yalong Shen
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Handong Sun
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore
| | - Haibo Zeng
- MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
- State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, China
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448
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Liu H, Wu Z, Shao J, Yao D, Gao H, Liu Y, Yu W, Zhang H, Yang B. CsPb xMn 1-xCl 3 Perovskite Quantum Dots with High Mn Substitution Ratio. ACS NANO 2017; 11:2239-2247. [PMID: 28145697 DOI: 10.1021/acsnano.6b08747] [Citation(s) in RCA: 212] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) are potential emitting materials for illumination and display applications, but toxic Pb is not environment- and user-friendly. In this work, we demonstrate the partial replacement of Pb with Mn through phosphine-free hot-injection preparation of CsPbxMn1-xCl3 QDs in colloidal solution. The Mn substitution ratio is up to 46%, and the as-prepared QDs maintain the tetragonal crystalline structure of the CsPbCl3 host. Meaningfully, Mn substitution greatly enhances the photoluminescence quantum yields of CsPbCl3 from 5 to 54%. The enhanced emission is attributed to the energy transfer of photoinduced excitons from the CsPbCl3 host to the doped Mn, which facilitates exciton recombination via a radiative pathway. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. A light-emitting diode (LED) prototype is further fabricated by employing the as-prepared CsPbxMn1-xCl3 QDs as color conversion materials on a commercially available 365 nm GaN LED chip.
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Affiliation(s)
- Huiwen Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Zhennan Wu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Jieren Shao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Dong Yao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Hang Gao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Yi Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Weili Yu
- The China-US Joint Laboratory, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science , Changchun, 130033, People's Republic of China
| | - Hao Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
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449
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Davis NLK, de la Peña FJ, Tabachnyk M, Richter JM, Lamboll RD, Booker EP, Wisnivesky Rocca Rivarola F, Griffiths JT, Ducati C, Menke SM, Deschler F, Greenham NC. Photon Reabsorption in Mixed CsPbCl 3:CsPbI 3 Perovskite Nanocrystal Films for Light-Emitting Diodes. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:3790-3796. [PMID: 28316756 PMCID: PMC5354312 DOI: 10.1021/acs.jpcc.6b12828] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/15/2017] [Indexed: 05/21/2023]
Abstract
Cesium lead halide nanocrystals, CsPbX3 (X = Cl, Br, I), exhibit photoluminescence quantum efficiencies approaching 100% without the core-shell structures usually used in conventional semiconductor nanocrystals. These high photoluminescence efficiencies make these crystals ideal candidates for light-emitting diodes (LEDs). However, because of the large surface area to volume ratio, halogen exchange between perovskite nanocrystals of different compositions occurs rapidly, which is one of the limiting factors for white-light applications requiring a mixture of different crystal compositions to achieve a broad emission spectrum. Here, we use mixtures of chloride and iodide CsPbX3 (X = Cl, I) perovskite nanocrystals where anion exchange is significantly reduced. We investigate samples containing mixtures of perovskite nanocrystals with different compositions and study the resulting optical and electrical interactions. We report excitation transfer from CsPbCl3 to CsPbI3 in solution and within a poly(methyl methacrylate) matrix via photon reabsorption, which also occurs in electrically excited crystals in bulk heterojunction LEDs.
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Affiliation(s)
| | - Francisco J. de la Peña
- Department
of Materials Science and Metallurgy, University
of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, U.K.
| | - Maxim Tabachnyk
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | - Johannes M. Richter
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | - Robin D. Lamboll
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | - Edward P. Booker
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | | | - James T. Griffiths
- Department
of Materials Science and Metallurgy, University
of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, U.K.
| | - Caterina Ducati
- Department
of Materials Science and Metallurgy, University
of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, U.K.
| | - S. Matthew Menke
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | - Felix Deschler
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | - Neil C. Greenham
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
- E-mail: . Phone: +44 (0)1223 766301
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450
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Zhang X, Xu B, Wang W, Liu S, Zheng Y, Chen S, Wang K, Sun XW. Plasmonic Perovskite Light-Emitting Diodes Based on the Ag-CsPbBr 3 System. ACS APPLIED MATERIALS & INTERFACES 2017; 9:4926-4931. [PMID: 28090776 DOI: 10.1021/acsami.6b12450] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The enhanced luminescence through semiconductor-metal interactions suggests the great potential of device performance improvement via properly tailored plasmonic nanostructures. Surface plasmon enhanced electroluminescence in an all-inorganic CsPbBr3 perovskite light-emitting diode (LED) is fabricated by decorating the hole transport layer with the synthesized Ag nanorods. An increase of 42% and 43.3% in the luminance and efficiency is demonstrated for devices incorporated with Ag nanorods. The device with Ag introduction indicates identical optoelectronic properties to the controlled device without Ag nanostructures. The increased spontaneous emission rate caused by the Ag-induced plasmonic near-field effect is responsible for the performance enhancement. Therefore, the plasmonic Ag-CsPbBr3 nanostructure studied here provides a novel strategy on the road to the future development of perovskite LEDs.
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Affiliation(s)
- Xiaoli Zhang
- Department of Electrical & Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, China
- School of Electrical & Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Bing Xu
- Department of Electrical & Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, China
- School of Power and Mechanical Engineering, Wuhan University , Wuhan 430072, China
| | - Weigao Wang
- Department of Electrical & Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, China
| | - Sheng Liu
- School of Power and Mechanical Engineering, Wuhan University , Wuhan 430072, China
| | - Yuanjin Zheng
- School of Electrical & Electronic Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Shuming Chen
- Department of Electrical & Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, China
| | - Kai Wang
- Department of Electrical & Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, China
| | - Xiao Wei Sun
- Department of Electrical & Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, China
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