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Hung WK, Tseng YH, Lin CC, Chen SA, Hsu CH, Li CF, Chen YJ, Tseng ZL. Anion-Exchange Blue Perovskite Quantum Dots for Efficient Light-Emitting Devices. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3957. [PMID: 36432243 PMCID: PMC9693500 DOI: 10.3390/nano12223957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/01/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
In this study, blue perovskite quantum dots (PQDs) were prepared using didodecyldimethylammonium bromide (DDAB), which can passivate surface defects caused by the loss of surface ligands and reduce particle size distribution. After the passivation of DDAB, blue CsPbClxBr3-x PQDs dispersed in n-octane produced a more compact and uniform PQD thin film than the non-passivated ones. The resulting device showed a stabile lifetime, and an EL peak of 470 nm and a maximum EQE of 1.63% were obtained at an operating voltage of 2.6 V and a current density of 0.34 mA/cm2. This work aims to provide a simple method to prepare blue-emitting PQDs and high-performance PQD-based light-emitting devices.
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Affiliation(s)
- Wei-Kuan Hung
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Yi-Hsun Tseng
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Chun-Cheng Lin
- Department of Mathematic and Physical Sciences, General Education, R.O.C. Air Force Academy, Kaohsiung 820009, Taiwan
| | - Sih-An Chen
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
- Department of Mathematic and Physical Sciences, General Education, R.O.C. Air Force Academy, Kaohsiung 820009, Taiwan
| | | | - Chen-Feng Li
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Yen-Ju Chen
- Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 243303, Taiwan
| | - Zong-Liang Tseng
- Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 243303, Taiwan
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Ye T, Cheng P, Zeng H, Yao D, Pan X, Jiang H, Ding J. Pressure-Induced Bifurcation in the Photoluminescence of Red Carbon Quantum Dots: Coexistence of Emissions from Surface Groups and Nitrogen-Doped Cores. J Phys Chem Lett 2022; 13:4768-4777. [PMID: 35612965 DOI: 10.1021/acs.jpclett.2c01161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Carbon quantum dots (CDs) with favorable fluorescent properties have stimulated considerable effort to modulate their photoluminescence (PL) for bioimaging and sensing. However, the fluorescent mechanisms are still only partially understood due to the diverse physicochemical properties of CDs prepared by various synthesis methods and postpreparation processes. In this report, pressure-induced bifurcation of PL is reported in red carbon quantum dots (R-CDs) for the first time. The splitting of PL into an irreversible blue-shifted peak and a reversible red-shifted peak under pressure suggests the coexistence of multiple fluorescent mechanisms in R-CDs, i.e., emissions from surface groups and nitrogen-doped cores. The concentration and excitation laser energy dependencies of pressure-induced bifurcation, as well as the time-resolved PL, further support the coexistence of multiple emitters. Our results provide a method for distinguishing between the different fluorescent mechanisms related to surface groups and carbon cores in CDs.
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Affiliation(s)
- Tingting Ye
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Peng Cheng
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Hong Zeng
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Deyuan Yao
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Xiaomei Pan
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Huachao Jiang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Junfeng Ding
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
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Xing K, Cao S, Yuan X, Zeng R, Li H, Zou B, Zhao J. Thermal and photo stability of all inorganic lead halide perovskite nanocrystals. Phys Chem Chem Phys 2021; 23:17113-17128. [PMID: 34346439 DOI: 10.1039/d1cp02119b] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Inorganic lead halide perovskite (ILHP) nanocrystals (NCs) show great potential in solid state lighting and next generation display technology due to their excellent optical properties. However, almost all ILHP NCs are still facing the problem of unstable luminescence properties caused by heating and/or UV illumination. Further improving the thermal and photo stability of ILHP NCs has become the most urgent challenge for their practical application. This Perspective review specifically focuses on the thermal and photo stability of ILHP NCs, discusses and analyzes the factors that affect the thermal and photo stability of ILHP NCs from the perspective of surface ligands and structure composition, summarizes the current strategies to improve the thermal and photo stability of ILHP NCs, and presents the key challenges and perspectives on the research for the improvement of thermal and photo stability of ILHP NCs.
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Affiliation(s)
- Ke Xing
- School of Physical Science and Technology, MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China.
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Jayakrishnan R, Raj A, Varma SJ. Self-assembled methyl-ammonium lead bromide thin films with blue photoluminescence. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01933-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Vickers ET, Chen Z, Cherrette V, Smart T, Zhang P, Ping Y, Zhang JZ. Interplay between Perovskite Magic-Sized Clusters and Amino Lead Halide Molecular Clusters. RESEARCH (WASHINGTON, D.C.) 2021; 2021:6047971. [PMID: 33623920 PMCID: PMC7877386 DOI: 10.34133/2021/6047971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 11/09/2020] [Indexed: 05/10/2023]
Abstract
Recent progress has been made on the synthesis and characterization of metal halide perovskite magic-sized clusters (PMSCs) with ABX 3 composition (A = CH3NH3 + or Cs+, B = Pb2+, and X = Cl-, Br-, or I-). However, their mechanism of growth and structure is still not well understood. In our effort to understand their structure and growth, we discovered that a new species can be formed without the CH3NH3 + component, which we name as molecular clusters (MCs). Specifically, CH3NH3PbBr3 PMSCs, with a characteristic absorption peak at 424 nm, are synthesized using PbBr2 and CH3NH3Br as precursors and butylamine (BTYA) and valeric acid (VA) as ligands, while MCs, with an absorption peak at 402 nm, are synthesized using solely PbBr2 and BTYA, without CH3NH3Br. Interestingly, PMSCs are converted spontaneously overtime into MCs. An isosbestic point in their electronic absorption spectra indicates a direct interplay between the PMSCs and MCs. Therefore, we suggest that the MCs are precursors to the PMSCs. From spectroscopic and extended X-ray absorption fine structure (EXAFS) results, we propose some tentative structural models for the MCs. The discovery of the MCs is critical to understanding the growth of PMSCs as well as larger perovskite quantum dots (PQDs) or nanocrystals (PNCs).
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Affiliation(s)
- Evan T. Vickers
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
| | - Ziyi Chen
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada B3H 4R2
| | - Vivien Cherrette
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
| | - Tyler Smart
- Department of Physics, University of California, Santa Cruz, CA 95064, USA
| | - Peng Zhang
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada B3H 4R2
| | - Yuan Ping
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
| | - Jin Z. Zhang
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
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Chowdhury FA, Pradhan B, Ding Y, Towers A, Gesquiere A, Tetard L, Thomas J. Perovskite Quantum Dot-Reduced Graphene Oxide Superstructure for Efficient Photodetection. ACS APPLIED MATERIALS & INTERFACES 2020; 12:45165-45173. [PMID: 32897694 DOI: 10.1021/acsami.0c11966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
High-performance photodetectors require efficient photogeneration and charge transport. Perovskite quantum dots (PQDs) have received enormous interest for applications in optoelectronics due to their high photogeneration efficiency. However, they offer meager carrier transport. Reduced graphene oxide (RGO) exhibits inferior photoresponse compared to materials such as quantum dots. An effective synthesis protocol to grow PQDs from the RGO lattice may facilitate direct charge transfers from PQDs to RGO, which could not be accomplished by mixing individual PQDs with RGO or making a bilayer. At ambient condition, the photodetector fabricated with the PQD-RGO superstructure showed high responsivity of 1.07 × 103 A/W, detectivity of 1 × 1013 Jones as well as sharp switching in the visible wavelength. After 3 months in an unencapsulated sample, the photocurrent was decreased ∼10% of its initial value while preserving speed and cycle stability at ambient condition.
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Affiliation(s)
- Farzana A Chowdhury
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Basudev Pradhan
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Yi Ding
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States
| | - Andrew Towers
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Andre Gesquiere
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Laurene Tetard
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - Jayan Thomas
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, United States
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Affiliation(s)
- Xiaoyang Zhu
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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