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Yang J, Peng S, Zhao Y, Tang T, Guo J, Cui R, Sun T, Zhang M. Improving Three-Photon Fluorescence of Near-Infrared Quantum Dots for Deep Brain Imaging by Suppressing Biexciton Decay. NANO LETTERS 2024; 24:6706-6713. [PMID: 38775232 DOI: 10.1021/acs.nanolett.4c01406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Three-photon fluorescence microscopy (3PFM) is a promising brain research tool with submicrometer spatial resolution and high imaging depth. However, only limited materials have been developed for 3PFM owing to the rigorous requirement of the three-photon fluorescence (3PF) process. Herein, under the guidance of a band gap engineering strategy, CdTe/CdSe/ZnS quantum dots (QDs) emitting in the near-infrared window are designed for constructing 3PF probes. The formation of type II structure significantly increased the three-photon absorption cross section of QDs and caused the delocalization of electron-hole wave functions. The time-resolved transient absorption spectroscopy confirmed that the decay of biexcitons was significantly suppressed due to the appropriate band gap alignment, which further enhanced the 3PF efficiency of QDs. By utilizing QD-based 3PF probes, high-resolution 3PFM imaging of cerebral vasculature was realized excited by a 1600 nm femtosecond laser, indicating the possibility of deep brain imaging with these 3PF probes.
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Affiliation(s)
- Junlei Yang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
| | - Shiyi Peng
- State Key Laboratory of Extreme Photonics and Instrumentation, International Research Center for Advanced Photonics, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Zhejiang 310058, China
| | - Yunlong Zhao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
| | - Tao Tang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Jian Guo
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
| | - Ran Cui
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Taolei Sun
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
- Hubei Key Laboratory of Nanomedicine for Neurodegenerative Diseases, School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China
| | - Mingxi Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
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2
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Wang X, Chen A, Wu X, Zhang J, Dong J, Zhang L. Synthesis and Modulation of Low-Dimensional Transition Metal Chalcogenide Materials via Atomic Substitution. NANO-MICRO LETTERS 2024; 16:163. [PMID: 38546814 PMCID: PMC10978568 DOI: 10.1007/s40820-024-01378-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/17/2024] [Indexed: 04/01/2024]
Abstract
In recent years, low-dimensional transition metal chalcogenide (TMC) materials have garnered growing research attention due to their superior electronic, optical, and catalytic properties compared to their bulk counterparts. The controllable synthesis and manipulation of these materials are crucial for tailoring their properties and unlocking their full potential in various applications. In this context, the atomic substitution method has emerged as a favorable approach. It involves the replacement of specific atoms within TMC structures with other elements and possesses the capability to regulate the compositions finely, crystal structures, and inherent properties of the resulting materials. In this review, we present a comprehensive overview on various strategies of atomic substitution employed in the synthesis of zero-dimensional, one-dimensional and two-dimensional TMC materials. The effects of substituting elements, substitution ratios, and substitution positions on the structures and morphologies of resulting material are discussed. The enhanced electrocatalytic performance and photovoltaic properties of the obtained materials are also provided, emphasizing the role of atomic substitution in achieving these advancements. Finally, challenges and future prospects in the field of atomic substitution for fabricating low-dimensional TMC materials are summarized.
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Affiliation(s)
- Xuan Wang
- Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic and Electrophonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
| | - Akang Chen
- Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic and Electrophonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
| | - XinLei Wu
- Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic and Electrophonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
| | - Jiatao Zhang
- Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic and Electrophonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China.
| | - Jichen Dong
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
| | - Leining Zhang
- Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic and Electrophonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China.
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3
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Du R, Li X, Li Y, Li Y, Hou T, Li Y, Qiao C, Zhang J. Cation Exchange Synthesis of Aliovalent Doped InP QDs and Their ZnSe xS 1-x Shell Coating for Enhanced Fluorescence Properties. J Phys Chem Lett 2023; 14:670-676. [PMID: 36637473 DOI: 10.1021/acs.jpclett.2c03515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
III-V quantum dots (QDs), in particular InP QDs, have emerged as high-performance and environmentally friendly candidates to replace cadmium based QDs. InP QDs exhibit properties of direct band gap structure, low toxicity, and high mobility, which make them suitable for high-performance optoelectronic applications. However, it is still challenging to precisely regulate the components and crystal structure of InP QDs, especially in the engineered stable aliovalent doping. In this work, we developed our original reverse cation exchange strategy to achieve Cu+ doped InP (InP:Cu) QDs at lower temperature. A ZnSexS1-x shell was then homogeneously grown on the InP:Cu QDs as the passivation shell. The as-prepared InP:Cu@ZnSexS1-x core-shell QDs exhibited better fluorescence properties with a photoluminescence quantum yield (PLQY) of 56.47%. Due to the existence of multiple luminous centers in the QDs, variable temperature-dependent fluorescence characteristics have been studied. The high photoluminescence characteristics in the near-infrared region indicate their potential applications in optoelectronic devices and biological fields.
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Affiliation(s)
- Ruizhi Du
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Xinyuan Li
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - You Li
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Yuxi Li
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Tailei Hou
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Yuemei Li
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Chen Qiao
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Jiatao Zhang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, Ministry of Industry and Information Technology, MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
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4
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Feldmann S, Gangishetty MK, Bravić I, Neumann T, Peng B, Winkler T, Friend RH, Monserrat B, Congreve DN, Deschler F. Charge Carrier Localization in Doped Perovskite Nanocrystals Enhances Radiative Recombination. J Am Chem Soc 2021; 143:8647-8653. [PMID: 33993693 PMCID: PMC8297723 DOI: 10.1021/jacs.1c01567] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Indexed: 12/25/2022]
Abstract
Nanocrystals based on halide perovskites offer a promising material platform for highly efficient lighting. Using transient optical spectroscopy, we study excitation recombination dynamics in manganese-doped CsPb(Cl,Br)3 perovskite nanocrystals. We find an increase in the intrinsic excitonic radiative recombination rate upon doping, which is typically a challenging material property to tailor. Supported by ab initio calculations, we can attribute the enhanced emission rates to increased charge carrier localization through lattice periodicity breaking from Mn dopants, which increases the overlap of electron and hole wave functions locally and thus the oscillator strength of excitons in their vicinity. Our report of a fundamental strategy for improving luminescence efficiencies in perovskite nanocrystals will be valuable for maximizing efficiencies in light-emitting applications.
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Affiliation(s)
- Sascha Feldmann
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
| | - Mahesh K. Gangishetty
- Rowland
Institute, Harvard University, Cambridge, Massachusetts 02142, United States
- Department
of Chemistry and Physics, Mississippi State
University, Mississippi State, Mississippi 39762, United States
| | - Ivona Bravić
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
| | - Timo Neumann
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
- Walter
Schottky Institute, Technical University
of Munich, Garching 85748, Germany
| | - Bo Peng
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
| | - Thomas Winkler
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
| | - Richard H. Friend
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
| | - Bartomeu Monserrat
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
- Department
of Materials Science and Metallurgy, University
of Cambridge, Cambridge CB30FS, U.K.
| | - Daniel N. Congreve
- Rowland
Institute, Harvard University, Cambridge, Massachusetts 02142, United States
| | - Felix Deschler
- Cavendish
Laboratory, University of Cambridge, Cambridge CB30HE, U.K.
- Walter
Schottky Institute, Technical University
of Munich, Garching 85748, Germany
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5
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Bai X, Purcell-Milton F, Gun'ko YK. Near-infrared-emitting CIZSe/CIZS/ZnS colloidal heteronanonail structures. NANOSCALE 2020; 12:15295-15303. [PMID: 32648560 DOI: 10.1039/d0nr02777d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Multicomponent quantum nanostructures have attracted significant attention due to their potential applications in photovoltaics, optoelectronics and bioimaging. However, the preparation of anisotropic quaternary nanoheterostructures such as Cu-In-Zn-S(Se) (CIZS and CIZSe) is still very poorly explored and understood. Here, we report the synthesis and studies of NIR emissive CIZSe/CIZS/ZnS core/shell/shell nanoheterostructures with a unique hetero-nanonail (HNN) morphology. In our approach, wurtzite (WZ) CIZSe/CIZS core/shell QDs have been prepared by depositing a CIZS shell onto a previously synthesized chalcopyrite CIZSe QD core using a seeded growth technique. Following careful control of the ZnS shell growth resulted in the formation of the distinct nail-like CIZSe/CIZS/ZnS nanoheterostructure, where the CIZSe/CIZS core/shell QD is located near the "head" of the nail. The emission in the NIR region of the CIZSe/CIZS/ZnS nanocrystals is assigned to the CIZSe/CIZS core/shell quantum nanostructure. The CIZSe/CIZS/ZnS HNNs are particularly interesting due to a range of potential applications including bioimaging, biosensing, energy harvesting and NIR photodetectors. Finally, we also report the successful controlled growth of gold nanoparticles on the surface of the CIZSe/CIZS/ZnS nanonail-like heterostructure and the investigation of the resulting multimodal nanocomposites.
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Affiliation(s)
- Xue Bai
- School of Chemistry and CRANN institute, University of Dublin, Trinity College, Dublin, D02, Ireland.
| | - Finn Purcell-Milton
- School of Chemistry and CRANN institute, University of Dublin, Trinity College, Dublin, D02, Ireland. and BEACON, Bioeconomy SFI Research Centre, University College Dublin, Dublin 4, Ireland
| | - Yurii K Gun'ko
- School of Chemistry and CRANN institute, University of Dublin, Trinity College, Dublin, D02, Ireland. and BEACON, Bioeconomy SFI Research Centre, University College Dublin, Dublin 4, Ireland and ITMO University, St. Petersburg 197101, Russia
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6
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Liu J, Zhang J. Nanointerface Chemistry: Lattice-Mismatch-Directed Synthesis and Application of Hybrid Nanocrystals. Chem Rev 2020; 120:2123-2170. [DOI: 10.1021/acs.chemrev.9b00443] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jia Liu
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, P.R. China
| | - Jiatao Zhang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, P.R. China
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7
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Quantum dots mediated fluorescent “turn-off-on” sensor for highly sensitive and selective sensing of protein. Colloids Surf B Biointerfaces 2020; 185:110599. [DOI: 10.1016/j.colsurfb.2019.110599] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/13/2019] [Accepted: 10/16/2019] [Indexed: 11/19/2022]
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8
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A rapid and operator-safe powder approach for latent fingerprint detection using hydrophilic Fe3O4@SiO2-CdTe nanoparticles. Sci China Chem 2019. [DOI: 10.1007/s11426-019-9460-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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10
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Zhang JC, Pan C, Zhu YF, Zhao LZ, He HW, Liu X, Qiu J. Achieving Thermo-Mechano-Opto-Responsive Bitemporal Colorful Luminescence via Multiplexing of Dual Lanthanides in Piezoelectric Particles and its Multidimensional Anticounterfeiting. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1804644. [PMID: 30284321 DOI: 10.1002/adma.201804644] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 08/25/2018] [Indexed: 06/08/2023]
Abstract
Optical characteristics of luminescent materials, including emission color (wavelength), lifetime, and excitation mode, play crucial roles in data communication and information security. Conventional luminescent materials generally display unicolor, unitemporal, and unimodal (occasionally bimodal) emission, resulting in low-level readout and decoding. The development of multicolor, multitemporal, and multimodal luminescence in a single material has long been considered to be a significant challenge. In this study, for the first time, the superior integration of colorful (red-orange-yellow-green), bitemporal (fluorescent and delayed), and four-modal (thermo-/mechano-motivated and upconverted/downshifted) emissions in a particular piezoelectric particle via optical multiplexing of dual-lanthanide dopants is demonstrated. The as-prepared versatile NaNbO3 :Pr3+ ,Er3+ luminescent microparticles shown are particularly suitable for embedding into polymer films to achieve waterproof, flexible/wearable and highly stretchable features, and synchronously to provide multidimensional codes that can be visually read-out using simple and commonly available tools (including the LED of a smartphone, pen writing, cooling-heating stimuli, and ultraviolet/near-infrared lamps). These findings offer unique insight for designing highly integrated stimuli-responsive luminophors and smart devices toward a wide variety of applications, particularly advanced anticounterfeiting technology.
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Affiliation(s)
- Jun-Cheng Zhang
- College of Physics, Qingdao University, Qingdao, 266071, China
- College of Optical Science and Engineering, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China
| | - Cong Pan
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Yi-Fei Zhu
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Li-Zhen Zhao
- The State Key Laboratory, Qingdao University, Qingdao, 266071, China
| | - Hong-Wei He
- Industrial Research Institute of Nonwovens and Technical Textiles, College of Textiles and Clothing, Qingdao University, Qingdao, 266071, China
| | - Xiaofeng Liu
- College of Optical Science and Engineering, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China
| | - Jianrong Qiu
- College of Optical Science and Engineering, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China
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11
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Pandya R, Chen RYS, Cheminal A, Dufour M, Richter JM, Thomas TH, Ahmed S, Sadhanala A, Booker EP, Divitini G, Deschler F, Greenham NC, Ithurria S, Rao A. Exciton–Phonon Interactions Govern Charge-Transfer-State Dynamics in CdSe/CdTe Two-Dimensional Colloidal Heterostructures. J Am Chem Soc 2018; 140:14097-14111. [DOI: 10.1021/jacs.8b05842] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raj Pandya
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Richard Y. S. Chen
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Alexandre Cheminal
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Marion Dufour
- LPEM, ESPCI Paris, PSL Research University, CNRS, 10 Rue Vauquelin, 75005 Paris, France
| | - Johannes M. Richter
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Tudor H. Thomas
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Shahab Ahmed
- Institute for Manufacturing, Department of Engineering, University of Cambridge, 17 Charles Babbage Road, CB3 0FS, Cambridge, United Kingdom
| | - Aditya Sadhanala
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Edward P. Booker
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Giorgio Divitini
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, CB3 0FS, Cambridge, United Kingdom
| | - Felix Deschler
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Neil C. Greenham
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Sandrine Ithurria
- LPEM, ESPCI Paris, PSL Research University, CNRS, 10 Rue Vauquelin, 75005 Paris, France
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, J.J. Thompson Avenue, CB3 0HE, Cambridge, United Kingdom
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12
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Jin X, Chang C, Zhao W, Huang S, Gu X, Zhang Q, Li F, Zhang Y, Li Q. Balancing the Electron and Hole Transfer for Efficient Quantum Dot Light-Emitting Diodes by Employing a Versatile Organic Electron-Blocking Layer. ACS APPLIED MATERIALS & INTERFACES 2018; 10:15803-15811. [PMID: 29667818 DOI: 10.1021/acsami.8b00729] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The electron-blocking layer (EBL) is important to balance the charge carrier transfer and achieve highly efficient quantum dot light-emitting diodes (QLEDs). Here, we report the utilization of a soluble tert-butyldimethylsilyl chloride-modified poly( p-phenylene benzobisoxazole) (TBS-PBO) as an EBL for simultaneous good charge carrier transfer balance while maintaining a high current density. We show that the versatile TBS-PBO blocks excess electron injection into the quantum dots (QDs), thus leading to better charge carrier transfer balance. It also restricts the undesired QD-to-EBL electron-transfer process, which preserves the superior emission capabilities of the emitter. As a consequence, the TBS-PBO device delivers an external quantum efficiency (EQE) maximum of 16.7% along with a remarkable current density as high as 139 mA/cm2 with a brightness of 5484 cd/m2. The current density of our device is higher than those of insulator EBL-based devices because of the higher conductivity of the TBS-PBO versus insulator EBL, thus helping achieve high luminance values ranging from 1414 to 20 000 cd/cm2 with current densities ranging from 44 to 648 mA/cm2 and EQE > 14%. We believe that these unconventional features of the present TBS-PBO-based QLEDs will expand the wide use of TBS-PBO as buffer layers in other advanced QLED applications.
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Affiliation(s)
- Xiao Jin
- School of Physics Science and Technology , Lingnan Normal University , Zhanjiang 524048 , P. R. China
| | - Chun Chang
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology , Nanchang Hangkong University , Nanchang 330063 , P. R. China
| | - Weifeng Zhao
- School of Materials and Chemical Engineering , Xi'an Technological University , Xi'an 710021 , P. R. China
| | - Shujuan Huang
- School of Photovoltaic and Renewable Energy Engineering , University of New South Wales , Sydney , New South Wales 2052 , Australia
| | - Xiaobing Gu
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology , Nanchang Hangkong University , Nanchang 330063 , P. R. China
| | - Qin Zhang
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology , Nanchang Hangkong University , Nanchang 330063 , P. R. China
| | - Feng Li
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology , Nanchang Hangkong University , Nanchang 330063 , P. R. China
| | - Yubao Zhang
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology , Nanchang Hangkong University , Nanchang 330063 , P. R. China
| | - Qinghua Li
- School of Physics Science and Technology , Lingnan Normal University , Zhanjiang 524048 , P. R. China
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13
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Adegoke O, Takemura K, Park EY. Plasmonic Oleylamine-Capped Gold and Silver Nanoparticle-Assisted Synthesis of Luminescent Alloyed CdZnSeS Quantum Dots. ACS OMEGA 2018; 3:1357-1366. [PMID: 30023803 PMCID: PMC6045352 DOI: 10.1021/acsomega.7b01724] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Accepted: 01/12/2018] [Indexed: 06/08/2023]
Abstract
We report on a novel strategy to tune the structural and optical properties of luminescent alloyed quantum dot (QD) nanocrystals using plasmonic gold (Au) and silver (Ag) nanoparticles (NPs). Alloyed CdZnSeS QDs were synthesized via the organometallic synthetic route with different fabrication strategies that involve alternative utilization of blends of organic surfactants, ligands, capping agents, and plasmonic oleylamine (OLA)-functionalized AuNPs and AgNPs. Ligand exchange with thiol l-cysteine (l-cyst) was used to prepare the hydrophilic nanocrystals. Analysis of the structural properties using powder X-ray diffraction revealed that under the same experimental condition, the plasmonic NPs altered the diffractive crystal structure of the alloyed QDs. Depending on the fabrication strategy, the crystal nature of OLA-AuNP-assisted CdZnSeS QDs was a pure hexagonal wurtzite domain and a cubic zinc-blende domain, whereas the diffraction pattern of OLA-AgNP-assisted CdZnSeS QDs was dominantly a cubic zinc-blende domain. Insights into the growth morphology of the QDs revealed a steady transformation from a heterogeneous growth pattern to a homogenous growth pattern that was strongly influenced by the plasmonic NPs. Tuning the optical properties of the alloyed QDs via plasmonic optical engineering showed that the photoluminescence (PL) quantum yield (QY) of the AuNP-assisted l-cyst-CdZnSeS QDs was tuned from 10 to 31%, whereas the PL QY of the AgNP-assisted l-cyst-CdZnSeS QDs was tuned from 15 to 90%. The low PL QY was associated with the surface defect state, while the remarkably high PL QY exhibited by the AgNP-assisted l-cyst-CdZnSeS QDs lends strong affirmation that the fabrication strategy employed in this work provides a unique opportunity to create single ensemble, multifunctional, highly fluorescent alloyed QDs for tailored biological applications.
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Affiliation(s)
- Oluwasesan Adegoke
- Laboratory
of Biotechnology, Research Institute of
Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Kenshin Takemura
- Laboratory
of Biotechnology, Research Institute of
Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Enoch Y. Park
- Laboratory
of Biotechnology, Research Institute of
Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
- Laboratory
of Biotechnology, Department of Bioscience, Graduate School of Science
and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
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14
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Bu HB, Kim D. Quick Synthesis of Water-soluble, Luminescent ZnTe Nanoparticles by Hydrothermal Technique. CHEM LETT 2018. [DOI: 10.1246/cl.170917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hang-Beom Bu
- Nano Earth, 1-5-20 Kashitanishi, Higashiosaka, Osaka 577-0835, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - DaeGwi Kim
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
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15
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Dworak L, Roth S, Scheffer MP, Frangakis AS, Wachtveitl J. A thin CdSe shell boosts the electron transfer from CdTe quantum dots to methylene blue. NANOSCALE 2018; 10:2162-2169. [PMID: 29327031 DOI: 10.1039/c7nr08287h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
CdTe core and CdTe/CdSe core/shell quantum dots (QD) are investigated with steady state and time-resolved spectroscopic methods. The coating of the CdTe core with a 0.7 nm thick CdSe shell shifts the lowest exciton absorption band to the red by more than 70 nm making the CdTe/CdSe QD an interesting candidate for application in solar energy conversion. Femtosecond transient absorption measurements are applied to study the photoinduced electron transfer (ET) to the molecular acceptor methylene blue (MB). ET times after single excitation of the QD are determined for different MB : QD ratios. The ET reaction is significantly faster in the case of the MB-CdTe/CdSe QD complexes, indicative of an altered charge distribution in the photoexcited heterostructure with a higher electron density in the CdSe shell. As a result of the efficient absorption of incoming light and the faster ET reaction, the amount of reduced MB in the time resolved experiments is higher for CdTe/CdSe QD compared to CdTe QD.
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Affiliation(s)
- L Dworak
- Institute of Physical and Theoretical Chemistry, Goethe-University Frankfurt, Max-von-Laue-Str. 7, D-60438 Frankfurt am Main, Germany.
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16
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Jin X, Li H, Huang S, Gu X, Shen H, Li D, Zhang X, Zhang Q, Li F, Li Q. Bright alloy type-II quantum dots and their application to light-emitting diodes. J Colloid Interface Sci 2017; 510:376-383. [PMID: 28963940 DOI: 10.1016/j.jcis.2017.09.080] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 09/21/2017] [Accepted: 09/21/2017] [Indexed: 11/29/2022]
Abstract
Type-II quantum dots (QDs) are emerging as a promising candidate for full color light sources owing to their advantages in achieving full color light by tuning the heterostructures. Despite the recent developments in type-II QDs, the choices of proper materials are limited for the composition of a high-quality QD and it still remains a big challenge to enhance the photoluminescence (PL) quantum yields (QYs) of type-II QDs for light-emitting diode (LED) applications. Here, we develop CdxZn1-xS/ZnSe/ZnS type-II QDs with a maximum quantum yield as high as 88.5%. Time-resolved PL results show that the ZnS shell suppresses non-radiative pathways by passivating the surface of CdxZn1-xS/ZnSe, thus leading to a high QY. Moreover, our results demonstrate that the outer ZnS also benefits the charge injection and radiative recombinations of the CdxZn1-xS/ZnSe. The LED based on green Cd0.2Zn0.8S/ZnSe/ZnS QDs achieves a current efficiency (CE) of 9.17cdA-1, an external quantum efficiency (EQE) of 8.78% and a low turn-on voltage of ∼2.3V.
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Affiliation(s)
- Xiao Jin
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China; School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Haiyang Li
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Shujuan Huang
- School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Xiaobing Gu
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Huaibin Shen
- Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, PR China
| | - Danyang Li
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Xugu Zhang
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Qin Zhang
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Feng Li
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Qinghua Li
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, PR China.
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17
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Zheng H, Lei X, Cheng T, Liu S, Zeng X, Sun R. Enhancing the thermal dissipation of a light-converting composite for quantum dot-based white light-emitting diodes through electrospinning nanofibers. NANOTECHNOLOGY 2017; 28:265204. [PMID: 28498823 DOI: 10.1088/1361-6528/aa72d6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Quantum dots (QDs) have been developed as one of the most promising light-converting materials for white light-emitting diodes (LEDs). In current QD-based LED packaging structures, composites of QDs and polymers are used as light-converting layers. However, the ultralow thermal conductivity of such composites seriously hinders the dissipation of QD-generating heat. In this paper, we demonstrate a method to enhance the thermal dissipation of QD-polymer composites through electrospinning polymer nanofibers. QD-polymer films embedded by electrospun nanofibers were prepared. Benefitting from aligned polymer chains in the electrospun nanofibers, the through-panel and in-panel thermal conductivities of the proposed QD-polymer film increased by 39.9% and 423.1%, respectively, compared to traditional QD-polymer film. The proposed and traditional QD-polymer films were both packaged on chip on board (CoB) LEDs for experimental comparison. Compared to traditional QD-polymer film, the luminous flux and luminous efficiency of the LEDs were increased by up to 51.8% and 42.9% by the proposed QD-polymer film under a current of 800 mA, respectively. With an increase in the driving current from 20-800 mA, the correlated color temperature (CCT) variation decreased by 72.7%. The maximum temperatures in the QD-polymer films were reduced from 419 K-411 K under a driving current of 200 mA.
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Affiliation(s)
- Huai Zheng
- Hubei Key Laboratory of Waterjet Theory and New Technology, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, People's Republic of China. The Institute of Technological Sciences, Wuhan University, Wuhan 430072, People's Republic of China
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18
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Pietryga JM, Park YS, Lim J, Fidler AF, Bae WK, Brovelli S, Klimov VI. Spectroscopic and Device Aspects of Nanocrystal Quantum Dots. Chem Rev 2017; 116:10513-622. [PMID: 27677521 DOI: 10.1021/acs.chemrev.6b00169] [Citation(s) in RCA: 400] [Impact Index Per Article: 57.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The field of nanocrystal quantum dots (QDs) is already more than 30 years old, and yet continuing interest in these structures is driven by both the fascinating physics emerging from strong quantum confinement of electronic excitations, as well as a large number of prospective applications that could benefit from the tunable properties and amenability toward solution-based processing of these materials. The focus of this review is on recent advances in nanocrystal research related to applications of QD materials in lasing, light-emitting diodes (LEDs), and solar energy conversion. A specific underlying theme is innovative concepts for tuning the properties of QDs beyond what is possible via traditional size manipulation, particularly through heterostructuring. Examples of such advanced control of nanocrystal functionalities include the following: interface engineering for suppressing Auger recombination in the context of QD LEDs and lasers; Stokes-shift engineering for applications in large-area luminescent solar concentrators; and control of intraband relaxation for enhanced carrier multiplication in advanced QD photovoltaics. We examine the considerable recent progress on these multiple fronts of nanocrystal research, which has resulted in the first commercialized QD technologies. These successes explain the continuing appeal of this field to a broad community of scientists and engineers, which in turn ensures even more exciting results to come from future exploration of this fascinating class of materials.
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Affiliation(s)
- Jeffrey M Pietryga
- Nanotechnology and Advanced Spectroscopy Team, Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Young-Shin Park
- Nanotechnology and Advanced Spectroscopy Team, Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.,Center for High Technology Materials, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Jaehoon Lim
- Nanotechnology and Advanced Spectroscopy Team, Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Andrew F Fidler
- Nanotechnology and Advanced Spectroscopy Team, Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Wan Ki Bae
- Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology , Seoul 02792, Korea
| | - Sergio Brovelli
- Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca , I-20125 Milano, Italy
| | - Victor I Klimov
- Nanotechnology and Advanced Spectroscopy Team, Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
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19
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Jang Y, Shapiro A, Isarov M, Rubin-Brusilovski A, Safran A, Budniak AK, Horani F, Dehnel J, Sashchiuk A, Lifshitz E. Interface control of electronic and optical properties in IV–VI and II–VI core/shell colloidal quantum dots: a review. Chem Commun (Camb) 2017; 53:1002-1024. [DOI: 10.1039/c6cc08742f] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Core/shell heterostructures provide controlled optical properties, tuneable electronic structure, and chemical stability due to an appropriate interface design.
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20
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21
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Ling L, Wang W, Wang CF, Chen S. Fast access to core/shell/shell CdTe/CdSe/ZnO quantum dots via magnetic hyperthermia method. AIChE J 2016. [DOI: 10.1002/aic.15264] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Luting Ling
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering; Nanjing Tech University; Nanjing 210009 P. R. China
| | - Wei Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering; Nanjing Tech University; Nanjing 210009 P. R. China
| | - Cai-Feng Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering; Nanjing Tech University; Nanjing 210009 P. R. China
| | - Su Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering; Nanjing Tech University; Nanjing 210009 P. R. China
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22
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Granados Del Águila A, Groeneveld E, Maan JC, de Mello Donegá C, Christianen PCM. Effect of Electron-Hole Overlap and Exchange Interaction on Exciton Radiative Lifetimes of CdTe/CdSe Heteronanocrystals. ACS NANO 2016; 10:4102-10. [PMID: 26982795 DOI: 10.1021/acsnano.5b07158] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Wave function engineering has become a powerful tool to tailor the optical properties of semiconductor colloidal nanocrystals. Core-shell systems allow to design the spatial extent of the electron (e) and hole (h) wave functions in the conduction- and valence bands, respectively. However, tuning the overlap between the e- and h-wave functions not only affects the oscillator strength of the coupled e-h pairs (excitons) that are responsible for the light emission, but also modifies the e-h exchange interaction, leading to an altered excitonic energy spectrum. Here, we present exciton lifetime measurements in a strong magnetic field to determine the strength of the e-h exchange interaction, independently of the e-h overlap that is deduced from lifetime measurements at room temperature. We use a set of CdTe/CdSe core/shell heteronanocrystals in which the electron-hole separation is systematically varied. We are able to unravel the separate effects of e-h overlap and e-h exchange on the exciton lifetimes, and we present a simple model that fully describes the recombination lifetimes of heteronanostructures (HNCs) as a function of core volume, shell volume, temperature, and magnetic fields.
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Affiliation(s)
- Andrés Granados Del Águila
- High Field Magnet Laboratory (HFML-EMFL), Radboud University , 6525 ED Nijmegen, The Netherlands
- Institute for Molecules and Materials, Radboud University , 6525 AJ Nijmegen, The Netherlands
| | - Esther Groeneveld
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science , Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Jan C Maan
- High Field Magnet Laboratory (HFML-EMFL), Radboud University , 6525 ED Nijmegen, The Netherlands
- Institute for Molecules and Materials, Radboud University , 6525 AJ Nijmegen, The Netherlands
| | - Celso de Mello Donegá
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science , Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Peter C M Christianen
- High Field Magnet Laboratory (HFML-EMFL), Radboud University , 6525 ED Nijmegen, The Netherlands
- Institute for Molecules and Materials, Radboud University , 6525 AJ Nijmegen, The Netherlands
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23
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Kalytchuk S, Zhovtiuk O, Kershaw SV, Zbořil R, Rogach AL. Temperature-Dependent Exciton and Trap-Related Photoluminescence of CdTe Quantum Dots Embedded in a NaCl Matrix: Implication in Thermometry. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:466-476. [PMID: 26618345 DOI: 10.1002/smll.201501984] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Revised: 10/05/2015] [Indexed: 06/05/2023]
Abstract
Temperature-dependent optical studies of semiconductor quantum dots (QDs) are fundamentally important for a variety of sensing and imaging applications. The steady-state and time-resolved photoluminescence properties of CdTe QDs in the size range from 2.3 to 3.1 nm embedded into a protective matrix of NaCl are studied as a function of temperature from 80 to 360 K. The temperature coefficient is found to be strongly dependent on QD size, with the highest sensitivity obtained for the smallest size of QDs. The emission from solid-state CdTe QD-based powders is maintained with high color purity over a wide range of temperatures. Photoluminescence lifetime data suggest that temperature dependence of the intrinsic radiative lifetime in CdTe QDs is rather weak, and it is mostly the temperature-dependent nonradiative decay of CdTe QDs which is responsible for the thermal quenching of photoluminescence intensity. By virtue of the temperature-dependent photoluminescence behavior, high color purity, photostability, and high photoluminescence quantum yield (26%-37% in the solid state), CdTe QDs embedded in NaCl matrices are useful solid-state probes for thermal imaging and sensing over a wide range of temperatures within a number of detection schemes and outstanding sensitivity, such as luminescence thermochromic imaging, ratiometric luminescence, and luminescence lifetime thermal sensing.
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Affiliation(s)
- Sergii Kalytchuk
- 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
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, Olomouc, 783 71, Czech Republic
| | - Olga Zhovtiuk
- 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
| | - Stephen V Kershaw
- 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
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, Olomouc, 783 71, Czech Republic
| | - 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
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24
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Ge Y, Shah ZH, Wang C, Wang J, Mao W, Zhang S, Lu R. In Situ Encapsulation of Ultrasmall CuO Quantum Dots with Controlled Band-Gap and Reversible Thermochromism. ACS APPLIED MATERIALS & INTERFACES 2015; 7:26437-26444. [PMID: 26600010 DOI: 10.1021/acsami.5b09578] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Silica encapsulated ultrasmall CuO quantum dots (QDs; CuO@SiO2) were synthesized by reverse microemulsion. The CuO QDs with sizes ranging from 2.0 to 1.0 nm with corresponding band gaps of 1.4 to 2.6 eV were prepared simply by varying the concentration of the Cu(2+) precursor. The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV-vis spectroscopy. The CuO@SiO2 composite displayed reversible thermochromism which resulted from the strong electron-phonon coupling of ultrasmall CuO in the confined space of SiO2 and the enhanced band-gap shift in the visible light region depending on temperature. Besides, the as synthesized CuO@SiO2 was found to be highly stable for reversible thermochromism due to the micropore structure of silica matrix and local confinement of the QDs.
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Affiliation(s)
- Yuzhen Ge
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Zameer Hussain Shah
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Cui Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Jiasheng Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Wenxin Mao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Shufen Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Rongwen Lu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
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25
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Jethi L, Krause MM, Kambhampati P. Toward Ratiometric Nanothermometry via Intrinsic Dual Emission from Semiconductor Nanocrystals. J Phys Chem Lett 2015; 6:718-721. [PMID: 26262492 DOI: 10.1021/acs.jpclett.5b00024] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Semiconductor nanocrystals have been synthesized that support intrinsic dual emission from the excitonic core as well as the surface. By virtue of chemical control of the thermodynamics of the core/surface equilibria, these nanocrystals support ratiometric temperature sensing over a broad temperature scale. This surface-chemistry-based approach for creating intrinsic dual emission enables a completely new strategy for application of these nanocrystals in optical nanothermometry.
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Affiliation(s)
- Lakshay Jethi
- Department of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada
| | - Michael M Krause
- Department of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada
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26
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Jagtap AM, Khatei J, Koteswara Rao KSR. Exciton–phonon scattering and nonradiative relaxation of excited carriers in hydrothermally synthesized CdTe quantum dots. Phys Chem Chem Phys 2015; 17:27579-87. [DOI: 10.1039/c5cp04654h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The strength of the exciton–LO-phonon coupling, as reflected in the Huang–Rhys parameter ‘S’, is found to increase from 1.13 to 1.51 with a reduction in CdTe QD size from 4.8 to 3.0 nm.
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Affiliation(s)
| | - Jayakrishna Khatei
- Department of Physics
- Indian Institute of Science
- Bangalore – 560012
- India
- Solid State Institute and Schulich Faculty of Chemistry
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27
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Pedetti S, Ithurria S, Heuclin H, Patriarche G, Dubertret B. Type-II CdSe/CdTe Core/Crown Semiconductor Nanoplatelets. J Am Chem Soc 2014; 136:16430-8. [DOI: 10.1021/ja509307m] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Silvia Pedetti
- Nexdot, 10 rue Vauquelin, 75005 Paris, France
- Laboratoire de
Physique et d’Etude des Matériaux, ESPCI-ParisTech,
PSL Research University, Sorbonne Université UPMC Univ Paris
06, CNRS, 10 rue Vauquelin, 75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de
Physique et d’Etude des Matériaux, ESPCI-ParisTech,
PSL Research University, Sorbonne Université UPMC Univ Paris
06, CNRS, 10 rue Vauquelin, 75005 Paris, France
| | | | - Gilles Patriarche
- Laboratoire
Photonique
et Nanostructures, CNRS, 91460 Marcoussis, France
| | - Benoit Dubertret
- Laboratoire de
Physique et d’Etude des Matériaux, ESPCI-ParisTech,
PSL Research University, Sorbonne Université UPMC Univ Paris
06, CNRS, 10 rue Vauquelin, 75005 Paris, France
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28
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Yang P, Chen HS, Zhang S, Zhao J, Du Y, Miao Y, He H, Liu Y. Effect of Cd0.5Zn0.5S shells on temperature-dependent luminescence kinetics of CdSe quantum dots. RSC Adv 2014. [DOI: 10.1039/c4ra07399a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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29
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Zhou W, Guan W, Lu C. Covalent linking of quantum dots to polymer for inorganic–inorganic luminescence films via layer-by-layer assembly with clay. Chem Commun (Camb) 2014; 50:11370-3. [DOI: 10.1039/c4cc04838e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Mangum BD, Wang F, Dennis AM, Gao Y, Ma X, Hollingsworth JA, Htoon H. Competition between auger recombination and hot-carrier trapping in PL intensity fluctuations of type II nanocrystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:2892-2901. [PMID: 24715631 DOI: 10.1002/smll.201302896] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 02/18/2014] [Indexed: 06/03/2023]
Abstract
Performing time-tagged, time-correlated, single-photon-counting studies on individual colloidal nanocrystal quantum dots (NQDs), the evolution of photoluminescence (PL) intensity-fluctuation behaviors in near-infrared (NIR) emitting type II, InP/CdS core-shell NQDs is investigated as a function of shell thickness. It is observed that Auger recombination and hot-carrier trapping compete in defining the PL intensity-fluctuation behavior for NQDs with thin shells, whereas the role of hot-carrier trapping dominates for NQDs with thick shells. These studies further reveal the distinct ramifications of altering either the excitation fluence or repetition rate. Specifically, an increase in laser pump fluence results in the creation of additional hot-carrier traps. Alternately, higher repetition rates cause a saturation in hot-carrier traps, thus activating Auger-related PL fluctuations. Furthermore, it is shown that Auger recombination of negatively charged excitons is suppressed more strongly than that of positively charged excitons because of the asymmetry in the electron-hole confinement in type II NQDs. Thus, this study provides new understanding of how both NQD structure (shell thickness and carrier-separation characteristics) and excitation conditions can be used to tune the PL stability, with important implications for room-temperature single-photon generation. Specifically, the first non-blinking NQD capable of single-photon emission in the near-infrared spectral regime is described.
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Affiliation(s)
- Benjamin D Mangum
- Center for Integrated Nanotechnologies Materials Physics, & Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
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31
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Granados Del Águila A, Jha B, Pietra F, Groeneveld E, de Mello Donegá C, Maan JC, Vanmaekelbergh D, Christianen PCM. Observation of the full exciton and phonon fine structure in CdSe/CdS dot-in-rod heteronanocrystals. ACS NANO 2014; 8:5921-31. [PMID: 24861569 DOI: 10.1021/nn501026t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Light emission of semiconductor nanocrystals is a complex process, depending on many factors, among which are the quantum mechanical size confinement of excitons (coupled electron-hole pairs) and the influence of confined phonon modes and the nanocrystal surface. Despite years of research, the nature of nanocrystal emission at low temperatures is still under debate. Here we unravel the different optical recombination pathways of CdSe/CdS dot-in-rod systems that show an unprecedented number of narrow emission lines upon resonant laser excitation. By using self-assembled, vertically aligned rods and application of crystallographically oriented high magnetic fields, the origin of all these peaks is established. We observe a clear signature of an acoustic-phonon assisted transition, separated from the zero-phonon emission and optical-phonon replica, proving that nanocrystal light emission results from an intricate interplay between bright (optically allowed) and dark (optically forbidden) exciton states, coupled to both acoustic and optical phonon modes.
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Affiliation(s)
- Andrés Granados Del Águila
- High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University Nijmegen , Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
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32
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Colloidal hybrid heterostructures based on II–VI semiconductor nanocrystals for photocatalytic hydrogen generation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2014. [DOI: 10.1016/j.jphotochemrev.2013.12.001] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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33
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Nag A, Kundu J, Hazarika A. Seeded-growth, nanocrystal-fusion, ion-exchange and inorganic-ligand mediated formation of semiconductor-based colloidal heterostructured nanocrystals. CrystEngComm 2014. [DOI: 10.1039/c4ce00462k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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34
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Spencer BF, Cliffe MJ, Graham DM, Hardman SJO, Seddon EA, Syres KL, Thomas AG, Sirotti F, Silly MG, Akhtar J, O'Brien P, Fairclough SM, Smith JM, Chattopadhyay S, Flavell WR. Dynamics in next-generation solar cells: time-resolved surface photovoltage measurements of quantum dots chemically linked to ZnO (101̄0). Faraday Discuss 2014; 171:275-98. [DOI: 10.1039/c4fd00019f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The charge dynamics at the surface of the transparent conducting oxide and photoanode material ZnO are investigated in the presence and absence of light-harvesting colloidal quantum dots (QDs). The time-resolved change in surface potential upon photoexcitation has been measured in the m-plane ZnO (101̄0) using a laser pump-synchrotron X-ray probe methodology. By varying the oxygen annealing conditions, and hence the oxygen vacancy concentration of the sample, we find that dark carrier lifetimes at the ZnO surface vary from hundreds of μs to ms timescales, i.e. a persistent photoconductivity (PPC) is observed. The highly-controlled nature of our experiments under ultra-high vacuum (UHV), and the use of band-gap and sub-band-gap photoexcitation, allow us to demonstrate that defect states ca. 340 meV above the valence band edge are directly associated with the PPC, and that the PPC mediated by these defects dominates over the oxygen photodesorption mechanism. These observations are consistent with the hypothesis that ionized oxygen vacancy states are responsible for the PPC in ZnO. The effect of chemically linking two colloidal QD systems (type I PbS and type II CdS–ZnSe) to the surface has also been investigated. Upon deposition of the QDs onto the surface, the dark carrier lifetime and the surface photovoltage are reduced, suggesting a direct injection of charge carriers into the ZnO conduction band. The results are discussed in the context of the development of next-generation solar cells.
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Affiliation(s)
- Ben F. Spencer
- School of Physics and Astronomy and the Photon Science Institute
- The University of Manchester
- , United Kingdom
- The Cockcroft Institute
- Sci-Tech Daresbury, Keckwick Lane, Daresbury
| | - Matthew J. Cliffe
- School of Physics and Astronomy and the Photon Science Institute
- The University of Manchester
- , United Kingdom
- The Cockcroft Institute
- Sci-Tech Daresbury, Keckwick Lane, Daresbury
| | - Darren M. Graham
- School of Physics and Astronomy and the Photon Science Institute
- The University of Manchester
- , United Kingdom
| | - Samantha J. O. Hardman
- Manchester Institute of Biotechnology
- Faculty of Life Sciences
- University of Manchester
- Manchester M1 7DN, United Kingdom
| | - Elaine A. Seddon
- School of Physics and Astronomy and the Photon Science Institute
- The University of Manchester
- , United Kingdom
- The Cockcroft Institute
- Sci-Tech Daresbury, Keckwick Lane, Daresbury
| | - Karen L. Syres
- School of Chemistry
- The University of Nottingham
- Nottingham NG7 2RD, United Kingdom
| | - Andrew G. Thomas
- School of Physics and Astronomy and the Photon Science Institute
- The University of Manchester
- , United Kingdom
| | | | | | - Javeed Akhtar
- Department of Chemistry
- University of Manchester
- Manchester M13 9PL, United Kingdom
- Department of Physics
- Nano-Science & Materials Synthesis Laboratory
| | - Paul O'Brien
- Department of Chemistry
- University of Manchester
- Manchester M13 9PL, United Kingdom
| | | | - Jason M. Smith
- Department of Materials
- University of Oxford
- Oxford OX1 3PH, United Kingdom
| | - Swapan Chattopadhyay
- The Cockcroft Institute
- Sci-Tech Daresbury, Keckwick Lane, Daresbury
- Warrington WA4 4AD, United Kingdom
| | - Wendy R. Flavell
- School of Physics and Astronomy and the Photon Science Institute
- The University of Manchester
- , United Kingdom
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35
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Zhou J, Huang F, Xu J, Wang Y. Controllable synthesis of metal selenide heterostructures mediated by Ag2Se nanocrystals acting as catalysts. NANOSCALE 2013; 5:9714-9719. [PMID: 24056899 DOI: 10.1039/c3nr03601d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ag2Se nanocrystals were demonstrated to be novel semiconductor mediators, or in other word catalysts, for the growth of semiconductor heterostructures in solution. This is a result of the unique feature of Ag2Se as a fast ion conductor, allowing foreign cations to dissolve and then to heterogrow the second phase. Using Ag2Se nanocrystals as catalysts, dimeric metal selenide heterostructures such as Ag2Se-CdSe and Ag2Se-ZnSe, and even multi-segment heterostructures such as Ag2Se-CdSe-ZnSe and Ag2Se-ZnSe-CdSe, were successfully synthesized. Several interesting features were found in the Ag2Se based heterogrowth. At the initial stage of heterogrowth, a layer of the second phase forms on the surface of an Ag2Se nanosphere, with a curved junction interface between the two phases. With further growth of the second phase, the Ag2Se nanosphere tends to flatten the junction surface by modifying its shape from sphere to hemisphere in order to minimize the conjunct area and thus the interfacial energy. Notably, the crystallographic relationship of the two phases in the heterostructure varies with the lattice parameters of the second phase, in order to reduce the lattice mismatch at the interface. Furthermore, a small lattice mismatch at the interface results in a straight rod-like second phase, while a large lattice mismatch would induce a tortuous product. The reported results may provide a new route for developing novel selenide semiconductor heterostructures which are potentially applicable in optoelectronic, biomedical, photovoltaic and catalytic fields.
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Affiliation(s)
- Jiangcong Zhou
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
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36
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Zhou D, Zhang H. Critical growth temperature of aqueous CdTe quantum dots is non-negligible for their application as nanothermometers. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:3195-3197. [PMID: 24038853 DOI: 10.1002/smll.201201060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Affiliation(s)
- Ding Zhou
- State Key Laboratory of Supramolecular, Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China
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37
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Groeneveld E, Witteman L, Lefferts M, Ke X, Bals S, Van Tendeloo G, Donega CDM. Tailoring ZnSe-CdSe colloidal quantum dots via cation exchange: from core/shell to alloy nanocrystals. ACS NANO 2013; 7:7913-30. [PMID: 23941394 DOI: 10.1021/nn402931y] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We report a study of Zn(2+) by Cd(2+) cation exchange (CE) in colloidal ZnSe nanocrystals (NCs). Our results reveal that CE in ZnSe NCs is a thermally activated isotropic process. The CE efficiency (i.e., fraction of Cd(2+) ions originally in solution, Cdsol, that is incorporated in the ZnSe NC) increases with temperature and depends also on the Cdsol/ZnSe ratio. Interestingly, the reaction temperature can be used as a sensitive parameter to tailor both the composition and the elemental distribution profile of the product (Zn,Cd)Se NCs. At 150 °C ZnSe/CdSe core/shell hetero-NCs (HNCs) are obtained, while higher temperatures (200 and 220 °C) produce (Zn1-xCdx)Se gradient alloy NCs, with increasingly smoother gradients as the temperature increases, until homogeneous alloy NCs are obtained at T ≥ 240 °C. Remarkably, sequential heating (150 °C followed by 220 °C) leads to ZnSe/CdSe core/shell HNCs with thicker shells, rather than (Zn1-xCdx)Se gradient alloy NCs. Thermal treatment at 250 °C converts the ZnSe/CdSe core/shell HNCs into (Zn1-xCdx)Se homogeneous alloy NCs, while preserving the NC shape. A mechanism for the cation exchange in ZnSe NCs is proposed, in which fast CE takes place at the NC surface, and is followed by relatively slower thermally activated solid-state cation diffusion, which is mediated by Frenkel defects. The findings presented here demonstrate that cation exchange in colloidal ZnSe NCs provides a very sensitive tool to tailor the nature and localization regime of the electron and hole wave functions and the optoelectronic properties of colloidal ZnSe-CdSe NCs.
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Affiliation(s)
- Esther Groeneveld
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University , 3508 TA Utrecht, The Netherlands
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38
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Cassette E, Mirkovic T, Scholes GD. Toward the Control of Nonradiative Processes in Semiconductor Nanocrystals. J Phys Chem Lett 2013; 4:2091-2093. [PMID: 26283258 DOI: 10.1021/jz4010812] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Elsa Cassette
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Tihana Mirkovic
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Gregory D Scholes
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
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39
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40
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Mao H, Song J, Zhang Q, Liu D, Gong N, Li Y, Wu Q, Verpoort F, Song XM. Novel polystyrene microspheres functionalized by imidazolium and the electrocatalytic activity towards H₂O₂ of its Prussian blue composite. NANOTECHNOLOGY 2013; 24:215601. [PMID: 23619536 DOI: 10.1088/0957-4484/24/21/215601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Copolymerization of styrene (St) and 1-vinyl-3-ethylimidazolium bromide (VEIB), novel poly(St-co-VEIB) microspheres were generated. Owing to the presence of imidazolium groups, such microspheres having an average diameter of 125 nm, behave electropositively when dispersed in aqueous solution. Furthermore, due to the presence of imidazolium groups, having a capacity of ion-exchange and weak reducibility on the surface of the PS microspheres, [Fe(CN)₆]³⁻ was absorbed on the surface of poly(St-co-VEIB) microspheres, and simultaneously, Fe³⁺ was reduced to Fe²⁺. Thus, in situ growth of Prussian blue (PB) nanoparticles could occur on the surface of poly(St-co-VEIB) microspheres without the addition of any other reducing agent. This methodology, utilizing the ion-exchange and weak reducibility properties of the imidazolium groups on the surface of micro-/nanostructures is a novel general method for assembling hierarchical nanostructured materials. Finally, the electrochemical property of the strawberry-like PS/PB composite microspheres was also investigated by applying a glassy carbon electrode. A good repeatability of the cyclic voltammetry responses, having a good linearity and sensitivity, for the electrocatalytic reduction of H₂O₂ was obtained.
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Affiliation(s)
- Hui Mao
- Liaoning Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, People's Republic of China. College of Chemistry, Liaoning University, Shenyang 110036, People's Republic of China
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41
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Zhou D, Lin M, Liu X, Li J, Chen Z, Yao D, Sun H, Zhang H, Yang B. Conducting the temperature-dependent conformational change of macrocyclic compounds to the lattice dilation of quantum dots for achieving an ultrasensitive nanothermometer. ACS NANO 2013; 7:2273-2283. [PMID: 23402423 DOI: 10.1021/nn305423p] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a ligand decoration strategy to enlarge the lattice dilation of quantum dots (QDs), which greatly enhances the characteristic sensitivity of a QD-based thermometer. Upon a multiple covalent linkage of macrocyclic compounds with QDs, for example, thiolated cyclodextrin (CD) and CdTe, the conformation-related torsional force of CD is conducted to the inner lattice of CdTe under altered temperature. The combination of the lattice expansion/contraction of CdTe and the stress from CD conformation change greatly enhances the shifts of both UV-vis absorption and photoluminescence (PL) spectra, thus improving the temperature sensitivity. As an example, β-CD-decorated CdTe QDs exhibit the 0.28 nm shift of the spectra per degree centigrade (0.28 nm/°C), 2.4-fold higher than those of monothiol-ligand-decorated QDs.
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Affiliation(s)
- Ding Zhou
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
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42
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Interaction of flavonoids (baicalein and hesperetin) with CdTe QDs by optical and electrochemical methods and their analytical applications. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.12.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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43
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Gui R, An X. Layer-by-layer aqueous synthesis, characterization and fluorescence properties of type-II CdTe/CdS core/shell quantum dots with near-infrared emission. RSC Adv 2013. [DOI: 10.1039/c3ra43120g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A layer-by-layer epitaxial method was developed to synthesize water-soluble, near-infrared (NIR)-emitting type-II core–shell CdTe/CdS quantum dots (QDs) via employing glutathione-capped CdTe QDs as core templates, CdCl2 and thiourea as shell precursors.
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Affiliation(s)
- Rijun Gui
- School of Chemistry and Molecules Engineering
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
- School of Chemistry and Chemical Engineering
| | - Xueqin An
- School of Chemistry and Molecules Engineering
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
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44
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Xiao Q, Huang S, Su W, Chan WH, Liu Y. Facile synthesis and characterization of highly fluorescent and biocompatible N-acetyl-L-cysteine capped CdTe/CdS/ZnS core/shell/shell quantum dots in aqueous phase. NANOTECHNOLOGY 2012; 23:495717. [PMID: 23165590 DOI: 10.1088/0957-4484/23/49/495717] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The synthesis of water-soluble quantum dots (QDs) in aqueous phase has received much attention recently. To date various kinds of QDs such as CdTe, CdSe, CdTe/CdS and CdSe/ZnS have been synthesized by aqueous methods. However, generally poor-quality QDs (photoluminescent quantum yield (PLQY) lower than 30%) are obtained via this method and the 3-mercaptopropionic acid stabilizer is notorious for its toxicity and awful odor. Here we introduce a novel thiol ligand, N-acetyl-L-cysteine, as an ideal stabilizer that is successfully employed to synthesize high-quality CdTe/CdS/ZnS QDs via a simple aqueous phase. The core/shell/shell structures of the CdTe/CdS/ZnS QDs were verified by x-ray photoelectron spectroscopy, energy dispersive x-ray spectroscopy, x-ray powder diffraction and transmission electron microscopy. These QDs not only possess a high PLQY but also have excellent photostability and favorable biocompatibility, which is vital for many biological applications. This type of water-dispersed QD is a promising candidate for fluorescent probes in biological and medical fields.
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Affiliation(s)
- Qi Xiao
- College of Chemistry and Life Sciences, Guangxi Teachers Education University, Nanning 530001, People's Republic of China
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45
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Ke G, Wang C, Ge Y, Zheng N, Zhu Z, Yang CJ. L-DNA molecular beacon: a safe, stable, and accurate intracellular nano-thermometer for temperature sensing in living cells. J Am Chem Soc 2012; 134:18908-11. [PMID: 23126671 DOI: 10.1021/ja3082439] [Citation(s) in RCA: 132] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Noninvasive and accurate measurement of intracellular temperature is of great significance in biology and medicine. This paper describes a safe, stable, and accurate intracellular nano-thermometer based on an L-DNA molecular beacon (L-MB), a dual-labeled hairpin oligonucleotide built from the optical isomer of naturally occurring d-DNA. Relying on the temperature-responsive hairpin structure and the FRET signaling mechanism of MBs, the fluorescence of L-MBs is quenched below the melting temperature and enhanced with increasing temperature. Because of the excellent reversibility and tunable response range, L-MBs are very suitable for temperature sensing. More importantly, the non-natural L-DNA backbone prevents the L-MBs from binding to cellular nucleic acids and proteins as well as from being digested by nucleases inside the cells, thus ensuring excellent stability and accuracy of the nano-thermometer in a complex cellular environment. The L-MB nano-thermometer was used for the photothermal study of Pd nanosheets in living cells, establishing the nano-thermometer as a useful tool for intracellular temperature measurement.
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Affiliation(s)
- Guoliang Ke
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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46
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Zhao Y, Riemersma C, Pietra F, Koole R, Donegá CDM, Meijerink A. High-temperature luminescence quenching of colloidal quantum dots. ACS NANO 2012; 6:9058-67. [PMID: 22978378 DOI: 10.1021/nn303217q] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Thermal quenching of quantum dot (QD) luminescence is important for application in luminescent devices. Systematic studies of the quenching behavior above 300 K are, however, lacking. Here, high-temperature (300-500 K) luminescence studies are reported for highly efficient CdSe core-shell quantum dots (QDs), aimed at obtaining insight into temperature quenching of QD emission. Through thermal cycling (yoyo) experiments for QDs in polymer matrices, reversible and irreversible luminescence quenching processes can be distinguished. For a variety of core-shell systems, reversible quenching is observed in a similar temperature range, between 100 and 180 °C. The irreversible quenching behavior varies between different systems. Mechanisms for thermal quenching are discussed.
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Affiliation(s)
- Yiming Zhao
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
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47
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Zhang L, Lin Z, Luo JW, Franceschetti A. The birth of a type-II nanostructure: carrier localization and optical properties of isoelectronically doped CdSe:Te nanocrystals. ACS NANO 2012; 6:8325-8334. [PMID: 22900638 DOI: 10.1021/nn303060r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
CdTe/CdSe core/shell nanocrystals are the prototypical example of type-II nanoheterostructures, in which the electron and the hole wave functions are localized in different parts of the nanostructure. As the thickness of the CdSe shell increases above a few monolayers, the spectroscopic properties of such nanocrystals change dramatically, reflecting the underlying type-I → type-II transition. For example, the exciton Stokes shift and radiative lifetime increase, while the decreasing biexciton binding energy changes sign from positive to negative. Recent experimental results for CdSe nanocrystals isoelectronically doped with a few Te substitutional impurities, however, have revealed a very different dependence of the optical and electronic properties on the nanocrystal size. Here we use atomistic calculations based on the pseudopotential method for single-particle excitations and the configuration-interaction approach for many-particle excitations to investigate carrier localization and electronic properties of CdTe/CdSe nanocrystals as the size of the CdTe core decreases from a few nm (characteristic of core/shell CdTe/CdSe nanocrystals) to the single impurity limit. We find that the unusual spectroscopic properties of isoelectronically doped CdSe:Te nanocrystals can be rationalized in terms of the change in the localization volume of the electron and hole wave functions as the size of the nanocrystal increases. The size dependence of the exciton Stokes shift, exciton radiative lifetime, and biexciton binding energy reflects the extent of carrier localization around the Te impurities.
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Affiliation(s)
- Lijun Zhang
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
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48
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Chuang CH, Burda C. Contribution of Femtosecond Laser Spectroscopy to the Development of Advanced Optoelectronic Nanomaterials. J Phys Chem Lett 2012; 3:1921-1927. [PMID: 26292014 DOI: 10.1021/jz300299r] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Femtosecond laser spectroscopy has now been a powerful technique for over a decade to investigate charge carrier dynamics in nanoscale optoelectronic systems with a temporal resolution of 100 fs (10(-13) s) or better. Both transient absorption and time-resolved photoluminescence spectroscopy are now popular spectroscopic techniques, which are well-established and provide direct insight into the charge carrier dynamics of nanomaterials. In this Perspective, we focus mainly on the developments with regard to studies of semiconductor nanostructures. Controlling the charge carrier dynamics, including hot carrier relaxation, trapping, interfacial carrier transfer, carrier multiplication, and recombination, is essential for successful energy conversion or photocatalysis, to name two major optoelectronic applications. We will show how femtosecond laser spectroscopy evolved into techniques that unveil the dynamic charge carrier properties of semiconductor nanomaterials toward heterostructures and complex nanoarchitectures and that femtosecond time-resolved laser spectroscopy can shine light on the path to novel optoelectronic structures and emergent optoelectronic technologies.
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Affiliation(s)
- Chi-Hung Chuang
- Center for Chemical Dynamics and Nanomaterials Research, Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Clemens Burda
- Center for Chemical Dynamics and Nanomaterials Research, Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
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49
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Guan LY, Li YQ, Lin S, Zhang MZ, Chen J, Ma ZY, Zhao YD. Characterization of CdTe/CdSe quantum dots-transferrin fluorescent probes for cellular labeling. Anal Chim Acta 2012; 741:86-92. [PMID: 22840708 DOI: 10.1016/j.aca.2012.06.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 06/20/2012] [Accepted: 06/21/2012] [Indexed: 10/28/2022]
Abstract
In this paper, we prepared three types of transferrin-quantum dots conjugates (QDs-Tf) using three different methods (electrostatic interaction, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) coupling, denatured transferrin (dTf) coating). Fluorescence emission spectra, surface characteristics, zeta potentials of quantum dots (QDs) and QDs-Tf fluorescent probes were characterized by spectrophotometer, capillary electrophoresis, and dynamic light scattering. Fluorescent imaging of HeLa cells was also performed by QDs and QDs-Tf fluorescent probes. It was found that the fluorescence imaging performances of QDs-Tf probes prepared by electrostatic interaction and EDC coupling were better compared with the one prepared by dTf coating. Then a real-time single cell detection system was established to quantitatively evaluate cell labeling effects of QDs-Tf fluorescent probes. It was found that for cell labeling efficiency, the proportion of cells labeled by quantum dot probes to a group of cells, QDs-Tf probe prepared by EDC coupling showed the highest labeling efficiency (85.55±3.88%), followed by electrostatic interaction (78.86±9.57%), and dTf coating showed the lowest (40.09±10.2%). This efficiency order was confirmed by flow cytometry results. This study demonstrated the relationship between conjugation methods and the resultant QDs-Tf probes and provided a foundation for choosing appropriate QDs-Tf probes in cell labeling.
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Affiliation(s)
- Li-Yun Guan
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Department of Biomedical Engineering, Wuhan, HuBei 430074, PR China
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50
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Albers AE, Chan EM, McBride PM, Ajo-Franklin CM, Cohen BE, Helms BA. Dual-Emitting Quantum Dot/Quantum Rod-Based Nanothermometers with Enhanced Response and Sensitivity in Live Cells. J Am Chem Soc 2012; 134:9565-8. [DOI: 10.1021/ja302290e] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Aaron E. Albers
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Emory M. Chan
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Patrick M. McBride
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Caroline M. Ajo-Franklin
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Bruce E. Cohen
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Brett A. Helms
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
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