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Liu Z, Hao C, Sun Y, Wang J, Dube L, Chen M, Dang W, Hu J, Li X, Chen O. Rigid CuInS 2/ZnS Core/Shell Quantum Dots for High Performance Infrared Light-Emitting Diodes. NANO LETTERS 2024; 24:5342-5350. [PMID: 38630899 DOI: 10.1021/acs.nanolett.4c01249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
CuInS2 (CIS) quantum dots (QDs) represent an important class of colloidal materials with broad application potential, owing to their low toxicity and unique optical properties. Although coating with a ZnS shell has been identified as a crucial method to enhance optical performance, the occurrence of cation exchange has historically resulted in the unintended formation of Cu-In-Zn-S alloyed QDs, causing detrimental blueshifts in both absorption and photoluminescence (PL) spectral profiles. In this study, we present a facile one-pot synthetic strategy aimed at impeding the cation exchange process and promoting ZnS shell growth on CIS core QDs. The suppression of both electron-phonon interaction and Auger recombination by the rigid ZnS shell results in CIS/ZnS core/shell QDs that exhibit a wide near-infrared (NIR) emission coverage and a remarkable PL quantum yield of 92.1%. This effect boosts the fabrication of high-performance, QD-based NIR light-emitting diodes with the best stability of such materials so far.
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Affiliation(s)
- Zhenyang Liu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Chaoqi Hao
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Yingying Sun
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Junyu Wang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Lacie Dube
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Mingjun Chen
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Wei Dang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Jinxiao Hu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Xu Li
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Ou Chen
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
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2
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Qinghua L, Jinke B, Cuiying B, Zimei C, Jiyan H, Xuerong N, Xiao J, Bing X. Extensive emission tuning and characterization of highly efficient CuInS 2 quantum dots for white light-emitting diodes. OPTICS EXPRESS 2023; 31:36691-36701. [PMID: 38017814 DOI: 10.1364/oe.502064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 10/07/2023] [Indexed: 11/30/2023]
Abstract
Whole visible range emitting CuInS2/ZnS QDs were obtained with broad band-width and high luminous efficiency by altering the Cu/In ratio and coating ZnS layer. 1-Dodecanethiol (DDT) as a sulfur source in the ZnS coating process can inhibit the lattice defects caused by Zn2+ inter-diffusion, thus increasing the photoluminescence quantum yield (PL QY). Then the stability and lighting performance of white light-emitting diodes (WLEDs) based on these CuInS2/ZnS QDs were characterized. The optimized WLED device exhibited a moderate luminous efficacy (LE) (70.33 lm·W-1) and ultrahigh color qualities (CRI Ra = 92.7, R9 = 95.9, R13 = 96.3) with warm white at a correlated color temperature (CCT) of 4052 K.
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3
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Zhou Q, Shang Z. CuInS 2 Nanocrystals Embedded PMMA Composite Films: Adjustment of Polymer Molecule Weights and Application in Remote-Type White LEDs. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1085. [PMID: 36985979 PMCID: PMC10058765 DOI: 10.3390/nano13061085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 03/12/2023] [Accepted: 03/16/2023] [Indexed: 06/18/2023]
Abstract
The commercial application of colloidal semiconductor nanocrystals has been realized owing to the development of composite film technology. Here, we demonstrated the fabrication of green and red emissive CuInS2 nanocrystals embedded polymer composite films of equal thickness by using a precise solution casting method. The impacts of polymer molecular weight on the dispersibility of CuInS2 nanocrystals were then systematically studied through evaluating the decrease in transmittance and red shift of emission wavelength. The composite films made from PMMA of small molecular weights exhibited higher transmittance. Applications of these green and red emissive composite films as color converters in remote-type light-emitting devices were further demonstrated.
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4
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Ko M, Yoon S, Eo YJ, Lee KN, Do YR. Passivation and Interlayer Effect of Zr(i-PrO) 4 on Green CuGaS 2/ZnS/Zr(i-PrO) 4@Al 2O 3 and Red CuInS 2/ZnS/Zr(i-PrO) 4@Al 2O 3 QD Hybrid Powders. NANOSCALE RESEARCH LETTERS 2022; 17:106. [PMID: 36344881 PMCID: PMC9640527 DOI: 10.1186/s11671-022-03741-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Broadband emissive I-III-VI quantum dots (QDs) are synthesized as efficient and stable I-III-VI QDs to be used as eco-friendly luminescent materials in various applications. Here, we introduce the additional passivation of zirconium isopropoxide (Zr(i-PrO)4) to improve the optical properties and environmental stability of green-emitting CuGaS2/ZnS (G-CGS/ZnS) and red-emitting CuInS2/ZnS (R-CIS/ZnS) QDs. The photoluminescence quantum yield (PLQY) of both resultant Zr(i-PrO)4-coated G-CGS/ZnS and R-CIS/ZnS QDs reaches similar values of ~ 95%. In addition, the photostability and thermal-stability of G-CGS/ZnS/Zr(i-PrO)4 and R-CIS/ZnS/Zr(i-PrO)4 QDs are improved by reducing the ligand loss via encapsulation of the ligand-coated QD surface with Zr(i-PrO)4. It is also proved that the Zr(i-PrO)4-passivated interlayer mitigates the further degradation of I-III-V QDs from ligand loss even under harsh conditions during additional hydrolysis reaction of aluminum tri-sec-butoxide (Al(sec-BuO)3), forming easy-to-handle G-CGS/ZnS and R-CIS/ZnS QD-embedded Al2O3 powders. Therefore, the introduction of a Zr(i-PrO)4 complex layer potentially provides a strong interlayer to mitigate degradation of I-III-VI QD-embedded Al2O3 hybrid powders as well as passivation layer for protecting I-III-VI QD.
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Affiliation(s)
- Minji Ko
- Department of Chemistry, Kookmin University, Seoul, 02707, Republic of Korea
| | - Soyeon Yoon
- Department of Chemistry, Kookmin University, Seoul, 02707, Republic of Korea
| | - Yun Jae Eo
- Department of Chemistry, Kookmin University, Seoul, 02707, Republic of Korea
| | - Keyong Nam Lee
- Department of Chemistry, Kookmin University, Seoul, 02707, Republic of Korea
| | - Young Rag Do
- Department of Chemistry, Kookmin University, Seoul, 02707, Republic of Korea.
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5
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Indium doped CdTe colloidal quantum dots stabilised in aqueous medium for white light emission. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Huang QQ, Hu MY, Li YL, Chen NN, Li Y, Wei QH, Fu F. Novel ultrabright luminescent copper nanoclusters and application in light-emitting devices. Chem Commun (Camb) 2021; 57:9890-9893. [PMID: 34494033 DOI: 10.1039/d1cc03799d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Two newly synthesized ultra-small copper nanoclusters, [Cu3(μ3-H)(μ2-dppy)4](ClO4)2 (1) and [Cu4(μ4-H)(μ2-dppy)4(μ2-Cl)2](ClO4) (2) (dppy = diphenyl-2-pyridylphosphine), have been shown to exhibit ultrabright yellow and yellow-green room-temperature phosphorescence (RTP) emission, with high quantum yields of 71.8% and 63.5%, respectively. Therefore, nanocluster 1 has been applied for the first time as a single component phosphor for yellow and white light-emitting diodes (LEDs) with favourable characteristics.
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Affiliation(s)
- Qiu-Qin Huang
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Mei-Yue Hu
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Yan-Li Li
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Nan-Nan Chen
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Yi Li
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Qiao-Hua Wei
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China. .,State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - FengFu Fu
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
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7
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Hoisang W, Uematsu T, Torimoto T, Kuwabata S. Luminescent Quaternary Ag(In xGa 1-x)S 2/GaS y Core/Shell Quantum Dots Prepared Using Dithiocarbamate Compounds and Photoluminescence Recovery via Post Treatment. Inorg Chem 2021; 60:13101-13109. [PMID: 34410714 DOI: 10.1021/acs.inorgchem.1c01513] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cadmium-free quantum dots (QDs) consisting of silver-indium-gallium-sulfide (AIGS) quaternary semiconductors were successfully synthesized using a metal-dithiocarbamate complex with sufficiently high reactivity to produce metal sulfides. The introduction of a gallium diethyldithiocarbamate precursor decreased the reaction temperature to produce active intermediates, which were subsequently converted into AIGS QDs at 150 °C with silver and indium acetates. Because of the low reaction temperature, AIGS QDs with a tetragonal crystal phase were produced selectively, which favorably generated band-edge emission whose full width at half-maximum is smaller than 40 nm after they were coated with gallium sulfide (GaSy) shells. The compositional indium/gallium ratio was varied by changing the mixing ratio of the precursors used for the synthesis of the AIGS core, and the band-edge photoluminescence (PL) generated from the AIGS/GaSy core/shell QDs was blue-shifted with an increase in the gallium content in the core. Consequently, a pure green emission centered at 518 nm was obtained with a PL quantum yield as high as 68%.
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Affiliation(s)
- Watcharaporn Hoisang
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Osaka, Japan
| | - Taro Uematsu
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Osaka, Japan.,Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 2-1 Yamada-oka, Suita 565-0871, Osaka, Japan
| | - Tsukasa Torimoto
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Susumu Kuwabata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Osaka, Japan.,Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 2-1 Yamada-oka, Suita 565-0871, Osaka, Japan
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8
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Lv P, An X, Guan Z, Wang L, Zheng Z, Li X, Yin Z, Lin J, Tang A. Construction of Robust Cadmium-Free Cu-In-Zn-S Nanocrystals and Polyfluorene Derivatives Hybrid Emissive Layer for Stable Electroluminescent White Light-Emitting Devices. J Phys Chem Lett 2021; 12:7113-7119. [PMID: 34296612 DOI: 10.1021/acs.jpclett.1c02060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Combination of the merit of inorganic nanocrystals (NCs) and solution-processed conjugated polymer is a convenient strategy to obtain stable and efficient electroluminescent white-light-emitting diodes (el-WLEDs). In this work, an el-WLED was fabricated on the basis of Cd-free Cu-In-Zn-S (CIZS)/ZnS NCs blending with polyfluorene derivative poly[4-(octyloxy)-9,9-diphenylfluoren-2,7-diyl]-co-[5-(octyloxy)-9,9-diphenylfluoren-2,7-diyl] (PODPF), which exhibited a stable white light emission with a color rendering index value of 85. Meanwhile, it had a stable spectrum under high voltage due to the extremely weak energy transfer between PODPF and CIZS/ZnS NCs. To further improve the device performance, PC9O4 was used to replace PODPF, which presented better solubility and smoother film-forming properties. Thus, the maximum external quantum efficiency (EQE) of the optimized el-WLED was increased by 221% while maintaining a stable spectrum under high voltage. This work may provide a great foundation on color mixing cadmium-free el-WLEDs.
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Affiliation(s)
- Peiwen Lv
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China
| | - Xiang An
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China
| | - Zhongyuan Guan
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China
| | - Lijin Wang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China
| | - Zhiyong Zheng
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Xu Li
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
| | - Zhe Yin
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China
| | - Jinyi Lin
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China
| | - Aiwei Tang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China
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9
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Li JS, Tang Y, Li ZT, Li JX, Ding XR, Yu BH, Yu SD, Ou JZ, Kuo HC. Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss. ACS NANO 2021; 15:550-562. [PMID: 33356139 DOI: 10.1021/acsnano.0c05735] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, we analyze the influence of the pore structure of an SBA-15 particle on the light emission from its inner adsorbed quantum dots (QDs) and outer light-emitting diode (LED) chips. It is found that the particle features of a high refractive index, comparable feature size of pore structure, and lower amount of QD adsorption help with QD light extraction, demonstrating a mechanism to suppress QD light propagating through pores and thus reducing the reabsorption loss. We consequently developed highly efficient QD white LEDs with wet-mixing QD/SBA-15 nanocomposite particles (NPs) by further optimizing the packaging methods and the introduced NP mass ratio. The LEDs demonstrated a record luminous efficacy (the ratio of luminous flux to electrical power) of 206.8 (entrusted test efficiency of 205.8 lm W-1 certificated by China National Accreditation Service) and 137.6 lm W-1 at 20 mA for white LEDs integrating only green QDs and green-red QD color convertors, respectively, with improved operating stability. These results are comparable to conventional phosphor-based white LEDs, which can be a starting point for white LEDs only using QDs as convertors toward commercialization in the near future.
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Affiliation(s)
- Jia-Sheng Li
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
- Guangdong Provincial Key Laboratory of Semiconductor Micro Display, Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China
| | - Yong Tang
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
| | - Zong-Tao Li
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
- Guangdong Provincial Key Laboratory of Semiconductor Micro Display, Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China
| | - Jie-Xin Li
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
| | - Xin-Rui Ding
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
| | - Bin-Hai Yu
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
| | - Shu-Dong Yu
- National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
| | - Jian-Zhen Ou
- School of Engineering, RMIT University Melbourne 3000, Victoria, Australia
| | - Hao-Chung Kuo
- Department of Photonics and Institute of Electro-Optical Engineering College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, China
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10
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Long Z, Zhang W, Tian J, Chen G, Liu Y, Liu R. Recent research on the luminous mechanism, synthetic strategies, and applications of CuInS2 quantum dots. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01228a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We discuss the synthesis and luminescence mechanisms of CuInS2 QDs, the strategies to improve their luminous performance and their potential application in light-emitting devices, solar energy conversion, and the biomedical field.
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Affiliation(s)
- Zhiwei Long
- National Engineering Research Center for Rare Earth Materials
- General Research Institute for Nonferrous Metals
- Grirem Advanced Materials Co. Ltd
- Beijing
- P. R China
| | - Wenda Zhang
- National Engineering Research Center for Rare Earth Materials
- General Research Institute for Nonferrous Metals
- Grirem Advanced Materials Co. Ltd
- Beijing
- P. R China
| | - Junhang Tian
- National Engineering Research Center for Rare Earth Materials
- General Research Institute for Nonferrous Metals
- Grirem Advanced Materials Co. Ltd
- Beijing
- P. R China
| | - Guantong Chen
- National Engineering Research Center for Rare Earth Materials
- General Research Institute for Nonferrous Metals
- Grirem Advanced Materials Co. Ltd
- Beijing
- P. R China
| | - Yuanhong Liu
- National Engineering Research Center for Rare Earth Materials
- General Research Institute for Nonferrous Metals
- Grirem Advanced Materials Co. Ltd
- Beijing
- P. R China
| | - Ronghui Liu
- National Engineering Research Center for Rare Earth Materials
- General Research Institute for Nonferrous Metals
- Grirem Advanced Materials Co. Ltd
- Beijing
- P. R China
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11
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Li H, Jiang X, Wang A, Chu X, Du Z. Simple Synthesis of CuInS 2/ZnS Core/Shell Quantum Dots for White Light-Emitting Diodes. Front Chem 2020; 8:669. [PMID: 33195004 PMCID: PMC7477729 DOI: 10.3389/fchem.2020.00669] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 06/29/2020] [Indexed: 12/20/2022] Open
Abstract
In this study, the CuInS2/ZnS core/shell quantum dots (QDs) were prepared via simple and environmentally friendly solvothermal synthesis and were used as phosphors for white light-emitting diodes (WLEDs). The surface defect of the CuInS2 core QDs were passivated by the ZnS shell by forming CuInS2/ZnS core/shell QDs. By adjusting the Cu/In ratio and the nucleation temperature, the photoluminescence (PL) peak of the CuInS2 QDs was tunable in a range of 651-775 nm. After coating the ZnS layer and modifying oleic acid ligands, the PL quantum yield increased to 85.06%. The CuInS2/ZnS QD powder thermal stability results showed that the PL intensity of the QDs remained 91% at 100°C for 10 min. High color rendering index values (CRI, 90) and correlated color temperature of 4360 K for the efficient WLEDs were fabricated using CuInS2/ZnS QDs and (Ba,Sr)2SiO4:Eu2+ as color converters in combination with a blue GaN light-emitting diode chip.
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Affiliation(s)
- Huimin Li
- Key Lab for Special Functional Materials, Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng, China
| | - Xiaohong Jiang
- Key Lab for Special Functional Materials, Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng, China
| | - Anzhen Wang
- Key Lab for Special Functional Materials, Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng, China
| | - Xiaotian Chu
- Key Lab for Special Functional Materials, Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng, China
| | - Zuliang Du
- Key Lab for Special Functional Materials, Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Collaborative Innovation Center of Nano Functional Materials and Applications, School of Materials Science and Engineering, Henan University, Kaifeng, China
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12
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Li S, Zha T, Gong X, Hu Q, Yu M, Wu J, Li R, Wang J, Chen Y. Cu–Cd–Zn–S/ZnS core/shell quantum dot/polyvinyl alcohol flexible films for white light-emitting diodes. RSC Adv 2020; 10:24425-24433. [PMID: 35516201 PMCID: PMC9055132 DOI: 10.1039/d0ra03540h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 06/10/2020] [Indexed: 01/30/2023] Open
Abstract
We present a facile route for the synthesis of water-soluble Cu–Cd–Zn–S/ZnS core/shell quantum dots (QDs) by simple pH regulation. The PL spectra of Cu–Cd–Zn–S/ZnS core/shell quantum dots can cover the whole visible light region in the case of only two ratios of Cu/Cd/Zn. The emission wavelength of Cu–Cd–Zn–S/ZnS QDs can be conveniently tuned from 474 to 515 and 548 to 629 nm by adjusting the pH value when the ratios of Cu/Cd/Zn are fixed at 1 : 5 : 80 and 1 : 5 : 10, respectively. It is worth noting that under the condition of a constant Cu/Cd/Zn ratio, the UV-vis absorption spectra do not change with the fluorescence spectra, indicating that the band gap of QDs remains unchanged during the change of pH value. The photoluminescence (PL) quantum yield of the as-prepared QDs with yellow emission is up to 76%. The QDs also show excellent chemical stability after the deposition of the ZnS shell. Luminescent and flexible films are fabricated by combining Cu–Cd–Zn–S QDs with polyvinyl alcohol (PVA). The QD/PVA flexible hybrid films are successfully applied on top of a conventional blue InGaN chip for remote-type warm-white LEDs. As-fabricated warm-white LEDs exhibit a higher color rendering index (CRI) of about 89.2 and a correlated color temperature (CCT) of 4308 K. We present a facile route for the synthesis of water-soluble Cu–Cd–Zn–S/ZnS core/shell quantum dots (QDs) by simple pH regulation.![]()
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Affiliation(s)
- Shenjie Li
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Tianyong Zha
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Xiaoyu Gong
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Qi Hu
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Minghui Yu
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Jinyu Wu
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Ruolan Li
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Jiaming Wang
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
| | - Yanyan Chen
- School of Chemistry and Chemical Engineering
- Hefei University of Technology
- Hefei
- People's Republic of China
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Shin SJ, Koo JJ, Lee JK, Chung TD. Unique Luminescence of Hexagonal Dominant Colloidal Copper Indium Sulphide Quantum Dots in Dispersed Solutions. Sci Rep 2019; 9:20144. [PMID: 31882977 PMCID: PMC6934773 DOI: 10.1038/s41598-019-56762-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 11/14/2019] [Indexed: 12/04/2022] Open
Abstract
Luminescent hexagonal dominant copper indium sulphide (h-dominant CIS) quantum dots (QDs) by precursor-injection of mixed metal-dialkyldithiocarbamate precursors. Owing to the different reactivity of the precursors, this method allowed the CIS QDs to grow while retaining the crystallinity of the hexagonal nucleus. The photoluminescence (PL) spectra exhibited dual emission (600–700 nm red emission and 700–800 nm NIR emission) resulting from the combined contributions of the hexagonal (wurtzite) h-CIS and tetragonal (chalcopyrite) t-CIS QDs, i.e. the NIR and red emissions were due to the h-CIS QDs and coexisting t-CIS QDs (weight ratio of h-CIS/t-CIS ~ 10), respectively. The PL intensities of the h-CIS as well as t-CIS QDs were enhanced by post-synthetic heat treatment; the t-CIS QDs were particularly sensitive to the heat treatment. By separating h-CIS and t-CIS successfully, it was demonstrated that this phenomenon was not affected by size and composition but by the donor-acceptor pair states and defect concentration originating from their crystal structure. The h-dominant CIS QDs in this work provide a new technique to control the optical property of Cu-In-S ternary NCs.
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Affiliation(s)
- Samuel Jaeho Shin
- Department of Chemistry, College of Natural Science, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ja-Jung Koo
- Department of Chemistry, College of Natural Science, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jin-Kyu Lee
- Department of Chemistry, College of Natural Science, Seoul National University, Seoul, 08826, Republic of Korea.,Technology Research Centre, LG Chem, Seoul, 07796, Republic of Korea
| | - Taek Dong Chung
- Department of Chemistry, College of Natural Science, Seoul National University, Seoul, 08826, Republic of Korea. .,Advanced Institutes of Convergence Technology, Suwon-Si, Gyeonggi-do, 16229, Republic of Korea.
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14
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Confined Growth of Quantum Dots in Silica Spheres by Ion Exchange of “Trapped NH4+” for White-Light Emission. Chem 2019. [DOI: 10.1016/j.chempr.2019.06.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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15
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Kim JH, Kim KH, Yoon SY, Kim Y, Lee SH, Kim HS, Yang H. Tunable Emission of Bluish Zn-Cu-Ga-S Quantum Dots by Mn Doping and Their Electroluminescence. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8250-8257. [PMID: 30698949 DOI: 10.1021/acsami.8b20894] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
On the basis of bluish-emitting double-shelled quantum dots (QDs) of Zn-Cu-Ga-S (ZCGS)/ZnS/ZnS, Mn doping into ZCGS host with different Mn/Cu concentrations is implemented via surface adsorption and lattice diffusion. The resulting double-shelled Mn-doped ZCGS (ZCGS/Mn) QDs exhibit a distinct Mn2+ 4T1-6A1 emission as a consequence of effective lattice incorporation simultaneously with host intragap states-involving emissions of free-to-bound and donor-acceptor pair recombinations. The relative contribution of Mn emission to the overall photoluminescence (PL) is consistently proportional to its concentration, resulting in tunable PL from bluish, white, to reddish white. Regardless of Mn doping and its concentration, all QDs possess high PL quantum yield levels of 74-79%. Those undoped and doped QDs are then employed as an emitting layer (EML) of all-solution-processed QD-light-emitting diodes (QLEDs) with hybrid charge transport layers and their electroluminescence (EL) is compared. Compared to undoped QDs, doped analogues give rise to a huge spectral disparity of EL versus PL, specifically showing a near-complete quenching of Mn2+ EL. This unexpected observation is rationalized primarily by considering unbalanced carrier injection to QD EML on the basis of energetic alignment of the present QLED and rapid trapping of holes injected at intragap states of QDs.
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Affiliation(s)
- Jong-Hoon Kim
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
| | - Kyung-Hye Kim
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
| | - Suk-Young Yoon
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
| | - Yuri Kim
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
| | - Sun-Hyoung Lee
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
| | - Hyun-Sik Kim
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
| | - Heesun Yang
- Department of Materials Science and Engineering , Hongik University , Seoul 04066 , Korea
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Bai X, Purcell-Milton F, Gun'ko YK. Optical Properties, Synthesis, and Potential Applications of Cu-Based Ternary or Quaternary Anisotropic Quantum Dots, Polytypic Nanocrystals, and Core/Shell Heterostructures. NANOMATERIALS 2019; 9:nano9010085. [PMID: 30634642 PMCID: PMC6359286 DOI: 10.3390/nano9010085] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 12/28/2018] [Accepted: 12/31/2018] [Indexed: 12/29/2022]
Abstract
This review summaries the optical properties, recent progress in synthesis, and a range of applications of luminescent Cu-based ternary or quaternary quantum dots (QDs). We first present the unique optical properties of the Cu-based multicomponent QDs, regarding their emission mechanism, high photoluminescent quantum yields (PLQYs), size-dependent bandgap, composition-dependent bandgap, broad emission range, large Stokes’ shift, and long photoluminescent (PL) lifetimes. Huge progress has taken place in this area over the past years, via detailed experimenting and modelling, giving a much more complete understanding of these nanomaterials and enabling the means to control and therefore take full advantage of their important properties. We then fully explore the techniques to prepare the various types of Cu-based ternary or quaternary QDs (including anisotropic nanocrystals (NCs), polytypic NCs, and spherical, nanorod and tetrapod core/shell heterostructures) are introduced in subsequent sections. To date, various strategies have been employed to understand and control the QDs distinct and new morphologies, with the recent development of Cu-based nanorod and tetrapod structure synthesis highlighted. Next, we summarize a series of applications of these luminescent Cu-based anisotropic and core/shell heterostructures, covering luminescent solar concentrators (LSCs), bioimaging and light emitting diodes (LEDs). Finally, we provide perspectives on the overall current status, challenges, and future directions in this field. The confluence of advances in the synthesis, properties, and applications of these Cu-based QDs presents an important opportunity to a wide-range of fields and this piece gives the reader the knowledge to grasp these exciting developments.
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Affiliation(s)
- Xue Bai
- School of Chemistry and CRANN Institute, Trinity College Dublin, Dublin 2, Dublin, Ireland.
| | - Finn Purcell-Milton
- School of Chemistry and CRANN Institute, Trinity College Dublin, Dublin 2, Dublin, Ireland.
| | - Yuri K Gun'ko
- School of Chemistry and CRANN Institute, Trinity College Dublin, Dublin 2, Dublin, Ireland.
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Du XY, Ma K, Cheng R, She XJ, Zhang YW, Wang CF, Chen S, Xu C. Host-guest supramolecular assembly directing beta-cyclodextrin based nanocrystals towards their robust performances. JOURNAL OF HAZARDOUS MATERIALS 2019; 361:329-337. [PMID: 30245255 DOI: 10.1016/j.jhazmat.2018.08.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 08/02/2018] [Accepted: 08/10/2018] [Indexed: 06/08/2023]
Abstract
Fluorescent CdTe nanocrystals (NCs) capped with beta-cyclodextrin (β-CD) are successfully synthesized by host-guest supramolecular assembly of the hydrophobic alkyl chains of N-acetyl-l-cysteine (NAC) on the surface of CdTe NCs and eco-friendly β-CD via the promising simple hydrothermal method in our experiments. The as-prepared NCs display better stability and lower toxicity compared with traditional those only capped with NAC. Specially, cytotoxicity experiments to human umbilical vein endothelial cells in vitro and zebrafish embryo toxicological tests in vivo are performed to determine the toxicity of CdTe NCs. For their practical applications, the promising red-luminescent NCs are employed as stable and low poison red phosphors to fabricate white light-emitting diodes (WLEDs) with remarkable color-rendering index (CRI) being 91.6. This research offers significance for solving the difficulty in toxicity and instability of heavy metal based NCs, which has potential applications in future optoelectronic devices and biomarkers.
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Affiliation(s)
- Xiang-Yun Du
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China
| | - Kangzhe Ma
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China
| | - Rui Cheng
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China
| | - Xing-Jin She
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China
| | - Ya-Wen Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China
| | - Cai-Feng Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China
| | - Su Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials and College of Chemical Engineering, Nanjing Tech University (Former Nanjing University of Technology), Nanjing 210009, PR China.
| | - Chen Xu
- State Key Laboratory of Pharmaceutical Biotechnology and School of Life Sciences, Nanjing University, Nanjing 210023, PR China
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Liu Z, Liu J, Huang Y, Li J, Yuan Y, Ye H, Zhu D, Wang Z, Tang A. From one-dimensional to two-dimensional wurtzite CuGaS 2 nanocrystals: non-injection synthesis and photocatalytic evolution. NANOSCALE 2018; 11:158-169. [PMID: 30525146 DOI: 10.1039/c8nr07353h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Multinary copper-based chalcogenides exhibit significant performance in photocatalytic hydrogen evolution due to their suitable optical bandgap for visible light absorption and environmentally friendly character. Herein, high-quality wurtzite CuGaS2 (CGS) nanocrystals (NCs) were synthesized by using a one-step heating-up process without any injection, and the morphology could be tuned from one-dimensional (1D) to two-dimensional (2D) by precise choice of surface ligands and gallium precursors. The formation mechanism of CGS NCs was studied comprehensively by means of the temporal-evolution of the morphology, crystal structure and optical absorption results. The reaction started from djurleite Cu31S16 NCs, and then proceeded with the formation of Cu31S16-CGS heteronanostructures (HNS), and finally the transformation from HNS to monophasic CGS nanorods took place with prolonging of the synthesis time. The optical bandgap and the energy level of the different-dimensional CGS NCs exhibited a strong dependence on the morphology change, which correlated with the percentage of the exposed {001} and {100} facets. The theoretical calculation based on density functional theory (DFT) revealed that the (001) surface facilitated the charge transport rather than the (100) surface, which was consistent with the electrochemical impedance spectroscopy (EIS) results. As a result, the 2D CGS nanoplates with more exposed {001} facets exhibited an attractive photocatalytic hydrogen production activity under simulated solar illumination as compared to 1D and quasi-2D counterparts. This study demonstrates that control over the dimension of I-III-V group semiconductor NCs could lead to a significant improvement of the photocatalytic hydrogen evolution.
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Affiliation(s)
- Zheming Liu
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China.
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19
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Kim JH, Yoon SY, Kim KH, Lim HB, Kim HJ, Yang H. Electroluminescence from two I-III-VI quantum dots of A-Ga-S (A=Cu, Ag). OPTICS LETTERS 2018; 43:5287-5290. [PMID: 30382989 DOI: 10.1364/ol.43.005287] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 09/30/2018] [Indexed: 06/08/2023]
Abstract
Together with III-V InP, chalcopyrite I-III-VI metal chalcogenides particularly with the compositions of A-B-S (A=Cu+, Ag+, B=In3+, Ga3+) are regarded as an emerging non-Cd class for synthesis of visible-emitting colloidal quantum dots (QDs) and the following fabrication of QD-light-emitting diodes (QLEDs). To date, the composition of I-III-VI QDs which were exploited for QLED fabrication remains highly limited, with most devices demonstrated from Cu-In-S-based ones. Herein, we explore the synthesis of two Ga-based I-III-VI QDs of Ag-Ga-S (AGS) and Cu-Ga-S (CGS) QDs and their application to QLED fabrication. Using cyan AGS/ZnS and azure CGS/ZnS core/shell QDs, all-solution-processed, multilayered QLEDs with a hybrid combination of organic hole transport layer and inorganic electron transport layer are fabricated and compared. We observe that CGS QLED by far outperforms in luminance and efficiency its AGS counterpart, which is ascribable to the differences in both electronic band structure and core/shell structure between two comparative QDs.
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Nagamine G, Nunciaroni HB, McDaniel H, Efros AL, de Brito Cruz CH, Padilha LA. Evidence of Band-Edge Hole Levels Inversion in Spherical CuInS 2 Quantum Dots. NANO LETTERS 2018; 18:6353-6359. [PMID: 30193071 DOI: 10.1021/acs.nanolett.8b02707] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
CuInS2 (CIS) quantum dots (QDs) have emerged as one of the most promising candidates for application in a number of new technologies, mostly due to their heavy-metal-free composition and their unique optical properties. Among those, the large Stokes shift and the long-lived excited state are the most striking ones. Although these properties are important, the physical mechanism that originates them is still under debate. Here, we use two-photon absorption spectroscopy and ultrafast dynamics studies to investigate the physical origin of those phenomena. From the two-photon absorption spectroscopy, we observe yet another unique property of CIS QDs, a two-photon absorption transition below the one-photon absorption band edge, which has never been observed before for any other semiconductor nanostructure. This originates from the inversion of the 1S and 1P hole level order at the top of the valence band and results in a blue-shift of the experimentally measured one photon absorption edge by nearly 100 to 200 meV. However, this shift is not large enough to account for the Stokes shift observed, 200-500 meV. Consequently, despite the existence of the below band gap optical transition, photoluminescence in CIS QDs must originate from trap sites. These conclusions are reinforced by the multiexciton dynamics studies. From those, we demonstrate that biexciton Auger recombination behaves similarly to negative trion dynamics on these nanomaterials, which suggests that the trap state is an electron donating site.
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Affiliation(s)
- Gabriel Nagamine
- Instituto de Fisica "GlebWataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165 , 13083-859 Campinas, Sao Paulo , Brazil
| | - Henrique B Nunciaroni
- Instituto de Fisica "GlebWataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165 , 13083-859 Campinas, Sao Paulo , Brazil
| | - Hunter McDaniel
- UbiQD, Inc. , 134 Eastgate Drive , Los Alamos , New Mexico 87544 , United States
| | - Alexander L Efros
- Center for Computational Materials Science , Naval Research Laboratory , Washington , D.C. 20375 , United States
| | - Carlos H de Brito Cruz
- Instituto de Fisica "GlebWataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165 , 13083-859 Campinas, Sao Paulo , Brazil
| | - Lazaro A Padilha
- Instituto de Fisica "GlebWataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165 , 13083-859 Campinas, Sao Paulo , Brazil
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Cheng Y, Shen C, Shen L, Xiang W, Liang X. Tb 3+, Eu 3+ Co-doped CsPbBr 3 QDs Glass with Highly Stable and Luminous Adjustable for White LEDs. ACS APPLIED MATERIALS & INTERFACES 2018; 10:21434-21444. [PMID: 29862821 DOI: 10.1021/acsami.8b05003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Herein, we have introduced rare-earth cations Tb3+ and Eu3+ into CsPbBr3 QDs glass by conventional melt-quenching. Rare-earth cations like Tb3+ emit green light, causing the main peak of bromide lead cesium to exhibit some redshift, owing to the energy transfer between CsPbBr3 and Tb3+. To achieve adjustable light, Eu3+ emits red light, which was doped in this glass with different proportions to solve the problem of red deficiency. More importantly, Tb3+ and Eu3+ co-doped CsPbBr3 QDs glass shows a series of desirable characteristics due to the energy transfer between Tb3+ and Eu3+. Interestingly, the blue light radiated by blue chip can excite Tb3+, Eu3+, and CsPbBr3 perovskite effectively. We acquired high-performance white light-emitting diodes with color-rendering index, color coordinate transformation, and luminous efficiency of 85.7, 4945 K, and 63.21 lm/W under the current of 20 mA. This acquired Tb3+, Eu3+ co-doped CsPbBr3 QDs glass proved the significant feasibility of luminescent materials in solid warm light source.
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Affiliation(s)
- Yinzi Cheng
- College of Chemistry and Materials Engineering, College of Life and Environmental Science , Wenzhou University , Wenzhou 325035 , People's Republic of China
| | - Chenyang Shen
- College of Chemistry and Materials Engineering, College of Life and Environmental Science , Wenzhou University , Wenzhou 325035 , People's Republic of China
| | - Linli Shen
- College of Chemistry and Materials Engineering, College of Life and Environmental Science , Wenzhou University , Wenzhou 325035 , People's Republic of China
| | - Weidong Xiang
- College of Chemistry and Materials Engineering, College of Life and Environmental Science , Wenzhou University , Wenzhou 325035 , People's Republic of China
| | - Xiaojuan Liang
- College of Chemistry and Materials Engineering, College of Life and Environmental Science , Wenzhou University , Wenzhou 325035 , People's Republic of China
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Li F, Nie C, You L, Jin X, Zhang Q, Qin Y, Zhao F, Song Y, Chen Z, Li Q. White light emitting device based on single-phase CdS quantum dots. NANOTECHNOLOGY 2018; 29:205701. [PMID: 29469816 DOI: 10.1088/1361-6528/aab18e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
White light emitting diodes (WLEDs) based on quantum dots (QDs) are emerging as robust candidates for white light sources, however they are suffering from the problem of energy loss resulting from the re-absorption and self-absorption among the employed QDs of different peak wavelengths. It still remains a challenging task to construct WLEDs based on single-phase QD emitters. Here, CdS QDs with short synthesis times are introduced to the fabrication of WLEDs. With a short synthesis time, on one hand, CdS QDs with a small diameter with blue emission can be obtained. On the other hand, surface reconstruction barely has time to occur, and the surface is likely defect-ridden, which enables the existence of a broad emission covering the range of green, yellow and red regions. This is essential for the white light emission of CdS QDs, and is very important for WLED applications. The temporal evolution of the PL spectra for CdS QDs was obtained to investigate the influence of growth time on the luminescent properties. The CdS QDs with a growth time of 0.5 min exhibited a colour rendering index (CRI) of 79.5 and a correlated colour temperature (CCT) of 6238 K. With increasing reaction time, the colour coordinates of the CdS QDs will move away from the white light region in the CIE 1931 chromaticity diagram. By integrating the as prepared white light emission CdS QDs with a violet GaN chip, WLEDs were fabricated. The fabricated WLEDs exhibited a CRI of 87.9 and a CCT of 4619 K, which satisfy the demand of general illumination. The luminous flux and the luminous efficiency of the fabricated WLEDs, being less advanced than current commercial white light sources, can be further improved, meaning there is a need for much more in-depth studies on white light emission CdS QDs.
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Affiliation(s)
- Feng Li
- Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang, 330063, People's Republic of China
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Zhang WJ, Pan CY, Cao F, Wang H, Yang X. Bright violet-to-aqua-emitting cadmium-free Ag-doped Zn-Ga-S quantum dots with high stability. Chem Commun (Camb) 2018; 54:4176-4179. [PMID: 29629448 DOI: 10.1039/c8cc01293h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we report a new series of ultra-stable Cd-free Ag:Zn-Ga-S/ZnS quantum dots (QDs) with an overall short emission wavelength tunable from 370 to 540 nm via a facile one-pot non-injection method. The highest PL quantum yield of the resultant core/shell QDs could be up to 85%, and the exceptional luminescence could be maintained not only at 300 °C but also after phase transfer.
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Affiliation(s)
- Wen-Jin Zhang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
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24
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I-III-VI chalcogenide semiconductor nanocrystals: Synthesis, properties, and applications. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(18)63052-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Kim BY, Kim JH, Lee KH, Jang EP, Han CY, Jo JH, Jang HS, Yang H. Synthesis of highly efficient azure-to-blue-emitting Zn-Cu-Ga-S quantum dots. Chem Commun (Camb) 2018; 53:4088-4091. [PMID: 28349135 DOI: 10.1039/c7cc00952f] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To realize blue emission-capable non-Cd I-III-VI quantum dots (QDs), we explore the synthesis of ternary Cu-Ga-S (CGS) QDs and subsequent quaternary Zn-Cu-Ga-S (ZCGS) via Zn alloying into a CGS host. The resulting ZCGS/ZnS core/shell QDs possess not only Zn content-dependent tunable emissions in the azure-to-blue range but also exceptional quantum yields of 78-83%.
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Affiliation(s)
- Bu-Yong Kim
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
| | - Jong-Hoon Kim
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
| | - Ki-Heon Lee
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
| | - Eun-Pyo Jang
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
| | - Chang-Yeol Han
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
| | - Jung-Ho Jo
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
| | - Ho Seong Jang
- Center for Materials Architecturing, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
| | - Heesun Yang
- Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea.
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Chen B, Pradhan N, Zhong H. From Large-Scale Synthesis to Lighting Device Applications of Ternary I-III-VI Semiconductor Nanocrystals: Inspiring Greener Material Emitters. J Phys Chem Lett 2018; 9:435-445. [PMID: 29303589 DOI: 10.1021/acs.jpclett.7b03037] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Quantum dots with fabulous size-dependent and color-tunable emissions remained as one of the most exciting inventories in nanomaterials for the last 3 decades. Even though a large number of such dot nanocrystals were developed, CdSe still remained as unbeatable and highly trusted lighting nanocrystals. Beyond these, the ternary I-III-VI family of nanocrystals emerged as the most widely accepted greener materials with efficient emissions tunable in visible as well as NIR spectral windows. These bring the high possibility of their implementation as lighting materials acceptable to the community and also to the environment. Keeping these in mind, in this Perspective, the latest developments of ternary I-III-VI nanocrystals from their large-scale synthesis to device applications are presented. Incorporating ZnS, tuning the composition, mixing with other nanocrystals, and doping with Mn ions, light-emitting devices of single color as well as for generating white light emissions are also discussed. In addition, the future prospects of these materials in lighting applications are also proposed.
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Affiliation(s)
- Bingkun Chen
- Beijing Engineering Research Centre of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology , Beijing 100081, China
| | - Narayan Pradhan
- Department of Materials Science, Indian Association for the Cultivation of Science , Kolkata, India 700032
| | - Haizheng Zhong
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology , Beijing 100081, China
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Ye Y, Zang Z, Zhou T, Dong F, Lu S, Tang X, Wei W, Zhang Y. Theoretical and experimental investigation of highly photocatalytic performance of CuInZnS nanoporous structure for removing the NO gas. J Catal 2018. [DOI: 10.1016/j.jcat.2017.11.002] [Citation(s) in RCA: 178] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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28
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Li F, You L, Nie C, Zhang Q, Jin X, Li H, Gu X, Huang Y, Li Q. Quantum dot white light emitting diodes with high scotopic/photopic ratios. OPTICS EXPRESS 2017; 25:21901-21913. [PMID: 29041481 DOI: 10.1364/oe.25.021901] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 08/27/2017] [Indexed: 06/07/2023]
Abstract
Alloy core/shell CdxZn1-xS/ZnS quantum dots (QDs) are emerging as robust candidates for light-emitting diodes (LEDs), however the emission range of the current CdxZn1-xS/ZnS is quite limited, ranging from 390 to 470 nm. It still remains a challenging task to construct white LEDs based on current CdxZn1-xS/ZnS system. Here, a versatile ZnSe with a moderate band gap is introduced onto the Cd0.1Zn0.9S core. The ZnSe shell, on one hand, can passivate the core surface which leads to bright emissions. On the other hand, it is essential in extending the emission to red region so that the emission wavelengths of Cd0.1Zn0.9S/ZnS and Cd0.1Zn0.9S/ZnSe QDs can cover the whole visible region, which is very important for white LED applications. Two- and four-hump QD-based LEDs are computationally and experimentally investigated. Results show that four-hump quantum dot light-emitting diodes (QLED) have better performances than the two-hump one, in the luminous and the vision properties. The fabricated white LEDs (WLEDs) based on Cd0.1Zn0.9S/ZnS and Cd0.1Zn0.9S/ZnSe QDs exhibits a scotopic/photopic ratio (S/P) ratio as high as 2.52, which exceeds the current limit of 2.50 by common lighting technologies, a color rendering index of 90.3, a luminous efficacy of optical radiation of 460.78 lumen per unit optical power, and a correlated color temperature of 5454 K. These results suggest that CdxZn1-xS/ZnS and CdxZn1-xS/ZnSe quantum dots serving as emitters hold great promise for the next-generation white light source with better S/P ratio.
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Coughlan C, Ibáñez M, Dobrozhan O, Singh A, Cabot A, Ryan KM. Compound Copper Chalcogenide Nanocrystals. Chem Rev 2017; 117:5865-6109. [PMID: 28394585 DOI: 10.1021/acs.chemrev.6b00376] [Citation(s) in RCA: 327] [Impact Index Per Article: 46.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), energy storage (lithium-ion batteries, hydrogen generation), emissive materials (plasmonics, LEDs, biolabelling), sensors (electrochemical, biochemical), biomedical devices (magnetic resonance imaging, X-ray computer tomography), and medical therapies (photochemothermal therapies, immunotherapy, radiotherapy, and drug delivery). The confluence of advances in the synthesis, assembly, and application of these NCs in the past decade has the potential to significantly impact society, both economically and environmentally.
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Affiliation(s)
- Claudia Coughlan
- Department of Chemical Sciences and Bernal Institute, University of Limerick , Limerick, Ireland
| | - Maria Ibáñez
- Catalonia Energy Research Institute - IREC, Sant Adria de Besos , Jardins de les Dones de Negre n.1, Pl. 2, 08930 Barcelona, Spain
| | - Oleksandr Dobrozhan
- Catalonia Energy Research Institute - IREC, Sant Adria de Besos , Jardins de les Dones de Negre n.1, Pl. 2, 08930 Barcelona, Spain.,Department of Electronics and Computing, Sumy State University , 2 Rymskogo-Korsakova st., 40007 Sumy, Ukraine
| | - Ajay Singh
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Andreu Cabot
- Catalonia Energy Research Institute - IREC, Sant Adria de Besos , Jardins de les Dones de Negre n.1, Pl. 2, 08930 Barcelona, Spain.,ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Kevin M Ryan
- Department of Chemical Sciences and Bernal Institute, University of Limerick , Limerick, Ireland
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Gugula K, Entrup M, Stegemann L, Seidel S, Pöttgen R, Strassert CA, Bredol M. Solid Solution Quantum Dots with Tunable Dual or Ultrabroadband Emission for LEDs. ACS APPLIED MATERIALS & INTERFACES 2017; 9:521-528. [PMID: 27933758 DOI: 10.1021/acsami.6b08190] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Quantum dots that efficiently emit white light directly or feature a "candle-like" orange photoluminescence with a high Stokes shift are presented. The key to obtaining these unique emission properties is through controlled annealing of the core Cu-In-Ga-S quantum dots in the presence of zinc ions, thus forming Zn-Cu-In-Ga-S solid solutions with different distributions of the substitution and dopant elements. The as-obtained nanocrystals feature excellent quantum yields of up to 82% with limited or even eliminated reabsorption and a color rendering index of bare particles of up to 88, enabling the production of high-quality white LEDs using a single color converter layer. Furthermore, the color properties can be tuned by changing the experimental conditions as well as by varying the excitation wavelength. The multicomponent luminescence mechanism is discussed in detail based on similar literature reports. White LEDs with unparalleled color quality and competitive luminous efficacies are presented herein.
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Affiliation(s)
- Krzysztof Gugula
- Department of Chemical Engineering, Münster University of Applied Sciences , Stegerwaldstraße 39, 48565 Steinfurt, Germany
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster , Corrensstraße 30, 48149 Münster, Germany
| | - Michael Entrup
- Physikalisches Institut, Westfälische Wilhelms-Universität Münster , Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Linda Stegemann
- Physikalisches Institut and Center for Nanotechnology, Westfälische Wilhelms-Universität Münster , Heisenbergstraße 11, 48149 Münster, Germany
| | - Stefan Seidel
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster , Corrensstraße 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster , Corrensstraße 30, 48149 Münster, Germany
| | - Cristian A Strassert
- Physikalisches Institut and Center for Nanotechnology, Westfälische Wilhelms-Universität Münster , Heisenbergstraße 11, 48149 Münster, Germany
| | - Michael Bredol
- Department of Chemical Engineering, Münster University of Applied Sciences , Stegerwaldstraße 39, 48565 Steinfurt, Germany
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31
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Shang Y, Ning Z. Colloidal quantum-dots surface and device structure engineering for high-performance light-emitting diodes. Natl Sci Rev 2017. [DOI: 10.1093/nsr/nww097] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
The application of colloidal quantum dots for light-emitting devices has attracted considerable attention in recent years, due to their unique optical properties such as size-dependent emission wavelength, sharp emission peak and high luminescent quantum yield. Tremendous efforts have been made to explore quantum dots for light-emission applications such as light-emitting diodes (LEDs) and light converters. The performance of quantum-dots-based light-emitting diodes (QD-LEDs) has been increasing rapidly in recent decades as the development of quantum-dots synthesis, surface-ligand engineering and device-architecture optimization. Recently, the external quantum efficiencies of red quantum-dots LEDs have exceeded 20.5% with good stability and narrow emission peak. In this review, we summarize the recent advances in QD-LEDs, focusing on quantum-dot surface engineering and device-architecture optimization.
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Affiliation(s)
- Yuequn Shang
- School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhijun Ning
- School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China
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32
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Chen B, Susha AS, Reckmeier CJ, Kershaw SV, Wang Y, Zou B, Zhong H, Rogach AL. Mesoporous Aluminum Hydroxide Synthesized by a Single-Source Precursor-Decomposition Approach as a High-Quantum-Yield Blue Phosphor for UV-Pumped White-Light-Emitting Diodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1604284. [PMID: 27862427 DOI: 10.1002/adma.201604284] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 09/29/2016] [Indexed: 06/06/2023]
Abstract
Strongly emissive (photoluminescence quantum yield up to 65%), thermally stable aluminum hydroxide blue phosphors are synthesized by a single-source precursor-decomposition approach. Blue-emitting UV-pumped light-emitting diodes (LEDs) based on the aluminum hydroxide phosphor reach luminous efficiency of 27.5 lm W-1 , while UV-white-LEDs integrating blue-emitting aluminum hydroxide and red-emitting CuInS2 nanocrystals achieve high color-rendering-index values of 94.3 and luminous efficiency of 23.5 lm W-1 .
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Affiliation(s)
- Bingkun Chen
- Department of Physics and Materials Science & Center for Functional Photonics (CFP), City University of Hong Kong, Hong Kong S.A.R
- Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing, 100081, China
| | - Andrei S Susha
- Department of Physics and Materials Science & Center for Functional Photonics (CFP), City University of Hong Kong, Hong Kong S.A.R
| | - Claas J Reckmeier
- Department of Physics and Materials Science & Center for Functional Photonics (CFP), City University of Hong Kong, Hong Kong S.A.R
| | - Stephen V Kershaw
- Department of Physics and Materials Science & Center for Functional Photonics (CFP), City University of Hong Kong, Hong Kong S.A.R
| | - Yongtian Wang
- Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing, 100081, China
| | - Bingsuo Zou
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Haizheng Zhong
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Andrey L Rogach
- Department of Physics and Materials Science & Center for Functional Photonics (CFP), City University of Hong Kong, Hong Kong S.A.R
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33
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Ji WQ, Zhang QH, Wang CF, Chen S. Cu–In–S/ZnS Quantum Dots Embedded in Polyvinylpyrrolidone (PVP) Solids for White Light-Emitting Diodes (LEDs). Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b02698] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wen-Qing Ji
- State Key Laboratory of Materials-Oriented
Chemical Engineering and College of Chemical Engineering, Nanjing Tech University, 5 Xin Mofan Road, Nanjing 210009, People’s Republic of China
| | - Qiu-Hong Zhang
- State Key Laboratory of Materials-Oriented
Chemical Engineering and College of Chemical Engineering, Nanjing Tech University, 5 Xin Mofan Road, Nanjing 210009, People’s Republic of China
| | - Cai-Feng Wang
- State Key Laboratory of Materials-Oriented
Chemical Engineering and College of Chemical Engineering, Nanjing Tech University, 5 Xin Mofan Road, Nanjing 210009, People’s Republic of China
| | - Su Chen
- State Key Laboratory of Materials-Oriented
Chemical Engineering and College of Chemical Engineering, Nanjing Tech University, 5 Xin Mofan Road, Nanjing 210009, People’s Republic of China
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Lee S, Kim YK, Jang J. Long-term stability improvement of light-emitting diode using highly transparent graphene oxide paste. NANOSCALE 2016; 8:17551-17559. [PMID: 27714116 DOI: 10.1039/c6nr05173a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A highly transparent paste adhesive is successfully fabricated by introducing graphene oxide (GO) to silicone paste adhesive by using a solvent-exchange method. The GO incorporated in the paste adhesive has a significant role in improving thermal conductivity, transparency and adhesive strength. The GO-embedded silicone paste is applied as a die-attach paste to light-emitting diodes (LEDs) in order to enhance the optical quality of the LEDs. The presence of GO in the die-attach layer of the LEDs gives rise to the enhancement of luminous intensity, effective heat dissipation, improvement of moisture barrier property as well as high adhesive strength. Consequently, the LEDs with the GO-embedded die-attach paste exhibit enhanced long-term stability. This novel approach provides a feasible and effective strategy for improving LED performance.
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Affiliation(s)
- Seungae Lee
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA
| | - Yun Ki Kim
- School of Chemical and Biological Engineering, Seoul National University, Gwanak 1, Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
| | - Jyongsik Jang
- School of Chemical and Biological Engineering, Seoul National University, Gwanak 1, Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
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35
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Huang H, Chen B, Wang Z, Hung TF, Susha AS, Zhong H, Rogach AL. Water resistant CsPbX 3 nanocrystals coated with polyhedral oligomeric silsesquioxane and their use as solid state luminophores in all-perovskite white light-emitting devices. Chem Sci 2016; 7:5699-5703. [PMID: 30034709 PMCID: PMC6022059 DOI: 10.1039/c6sc01758d] [Citation(s) in RCA: 252] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 06/11/2016] [Indexed: 12/19/2022] Open
Abstract
We present an approach towards stable solid-state perovskite based luminophores with different emission colors via surface protection of CsPbX3 (X = Br or I) with a polyhedral oligomeric silsesquioxane (POSS). This treatment results in water resistant perovskite nanocrystal powders, and prevents otherwise easy anion exchange between perovskite nanocrystals of different compositions mixed together in the solid state, which allows us to preserve their distinct emission spectra. We subsequently used mixtures of green-emitting POSS-CsPbBr3 and red-emitting POSS-CsPb(Br/I)3 nanocrystal powders to fabricate single layer all-perovskite down conversion white light-emitting devices.
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Affiliation(s)
- He Huang
- Department of Physics and Materials Science , Centre for Functional Photonics (CFP) , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong , China .
| | - Bingkun Chen
- Department of Physics and Materials Science , Centre for Functional Photonics (CFP) , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong , China .
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems , School of Materials Science & Engineering , Beijing Institute of Technology , Beijing , 100081 , China
| | - Zhenguang Wang
- Department of Physics and Materials Science , Centre for Functional Photonics (CFP) , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong , China .
| | - Tak Fu Hung
- Department of Physics and Materials Science , Centre for Functional Photonics (CFP) , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong , China .
| | - Andrei S Susha
- Department of Physics and Materials Science , Centre for Functional Photonics (CFP) , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong , China .
| | - Haizheng Zhong
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems , School of Materials Science & Engineering , Beijing Institute of Technology , Beijing , 100081 , China
| | - Andrey L Rogach
- Department of Physics and Materials Science , Centre for Functional Photonics (CFP) , City University of Hong Kong , 83 Tat Chee Avenue , Kowloon , Hong Kong , China .
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36
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Yang GL, Zhong HZ. Organometal halide perovskite quantum dots: synthesis, optical properties, and display applications. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2016.06.047] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kim JH, Jo DY, Lee KH, Jang EP, Han CY, Jo JH, Yang H. White Electroluminescent Lighting Device Based on a Single Quantum Dot Emitter. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:5093-8. [PMID: 27135303 DOI: 10.1002/adma.201600815] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 03/06/2016] [Indexed: 05/04/2023]
Abstract
Using a single emitter of Cu-Ga-S/ZnS quantum dots, all-solution-processed white electroluminescent lighting device that not only exhibits the record quantities of 1007 cd m(-2) in luminance and 1.9% in external quantum efficiency but also possesses satisfactorily high color rendering indices of 83-88 is demonstrated.
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Affiliation(s)
- Jong-Hoon Kim
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
| | - Dae-Yeon Jo
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
| | - Ki-Heon Lee
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
| | - Eun-Pyo Jang
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
| | - Chang-Yeol Han
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
| | - Jung-Ho Jo
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
| | - Heesun Yang
- Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong, Mapo-gu, Seoul, 121-791, South Korea
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38
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Su L, Zhang X, Zhang Y, Rogach AL. Recent Progress in Quantum Dot Based White Light-Emitting Devices. Top Curr Chem (Cham) 2016; 374:42. [DOI: 10.1007/s41061-016-0041-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 05/27/2016] [Indexed: 01/09/2023]
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Erdem T, Demir HV. Colloidal nanocrystals for quality lighting and displays: milestones and recent developments. NANOPHOTONICS 2016; 5:74-95. [DOI: 10.1515/nanoph-2016-0009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
AbstractRecent advances in colloidal synthesis of nanocrystals have enabled high-quality high-efficiency light-emitting diodes, displays with significantly broader color gamut, and optically-pumped lasers spanning the whole visible regime. Here we review these colloidal platforms covering the milestone studies together with recent developments. In the review, we focus on the devices made of colloidal quantum dots (nanocrystals), colloidal quantum rods (nanorods), and colloidal quantum wells (nanoplatelets) as well as those of solution processed perovskites and phosphor nanocrystals. The review starts with an introduction to colloidal nanocrystal photonics emphasizing the importance of colloidal materials for light-emitting devices. Subsequently,we continue with the summary of important reports on light-emitting diodes, in which colloids are used as the color converters and then as the emissive layers in electroluminescent devices. Also,we review the developments in color enrichment and electroluminescent displays. Next, we present a summary of important reports on the lasing of colloidal semiconductors. Finally, we summarize and conclude the review presenting a future outlook.
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Affiliation(s)
- Talha Erdem
- 1Department of Electrical and Electronics Engineering, Department of Physics, Institute of Materials Science and Nanotechnology, and UNAM-National Nanotechnology Research Center, Bilkent, Ankara Turkey 06800
| | - Hilmi Volkan Demir
- 2Department of Electrical and Electronics Engineering, Department of Physics, Institute of Materials Science and Nanotechnology, and UNAM-National Nanotechnology Research Center, Bilkent, Ankara Turkey 06800 and Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
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40
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Ilaiyaraja P, Mocherla PSV, Srinivasan TK, Sudakar C. Synthesis of Cu-Deficient and Zn-Graded Cu-In-Zn-S Quantum Dots and Hybrid Inorganic-Organic Nanophosphor Composite for White Light Emission. ACS APPLIED MATERIALS & INTERFACES 2016; 8:12456-12465. [PMID: 27135154 DOI: 10.1021/acsami.6b02175] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cu-deficient graded-zinc Cu-In-Zn-S (CIZS) quantum dots (QDs) were synthesized by a two-step solvothermal method. These CIZS QDs exhibited size and composition tunable photoluminescence characteristics with emission color tunable from greenish-yellow to orange to red with a relatively high quantum yield between 45 and 60%. Novel white-light-emitting (WLE) hybrid composite is fabricated by integrating the blue-emissive 1,4-bis-2-(5-phenyl oxazolyl)-benzene (POPOP) organic fluorophore and quaternary CIZS inorganic QDs. Integrating CIZS QDs with POPOP fluorophore resulted in series of tunable emission colors with CIE coordinates lying in a straight line between the coordinates of the end member. WLE was shown for hybrid mixture comprising 0.5 nM of POPOP and 3 mg/mL of CIZS QDs with color coordinates (0.3312, 0.3324). Thin films of this hybrid mixture in PMMA matrix coated on UV-LED or on glass substrates with UV backlit light also showed broadband WLE with ideal CIE color coordinates of (0.34, 0.33), high color-rendering index value of 92, and correlated color temperature value of 5143 K. The hybrid composite exhibit Forster resonance energy transfer cascading from POPOP to CIZS which results in emission covering the entire visible spectral range. POPOP and CIZS QDs hybrid composite is a versatile material for WLED applications.
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Affiliation(s)
- P Ilaiyaraja
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras , Chennai-600036, India
| | - Pavana S V Mocherla
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras , Chennai-600036, India
| | - T K Srinivasan
- Electronic Instrumentation and Radiological Safety Group, Indira Gandhi Centre for Atomic Research , Kalpakkam-603106, India
| | - C Sudakar
- Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras , Chennai-600036, India
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41
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Jo DY, Kim D, Kim JH, Chae H, Seo HJ, Do YR, Yang H. Tunable White Fluorescent Copper Gallium Sulfide Quantum Dots Enabled by Mn Doping. ACS APPLIED MATERIALS & INTERFACES 2016; 8:12291-7. [PMID: 27120773 DOI: 10.1021/acsami.6b01763] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Fluorescence of semiconductor quantum dots (QDs) can be tuned by engineering the band gap via size and composition control and further doping them with impurity ions. Targeting on highly bright white-emissive I-III-VI -type copper gallium sulfide (Cu-Ga-S, CGS) host QDs with the entire visible spectral coverage of blue to red, herein, Mn(2+) ion doping, through surface adsorption and lattice diffusion is fulfilled. Upon doping a distinct Mn emission from (4)T1-(6)A1 transition successfully appears in white photoluminescence (PL) of undoped CGS/ZnS core/shell QDs and with varying Mn concentration a systematic white spectral evolution of CGS:Mn/ZnS QDs is achievable with high PL quantum yield retained. The origins of white PL of CGS:Mn/ZnS QDs that is well decomposed into three emission bands are appropriately assigned. The resulting single-phased, doped QDs are then employed as near-UV-to-white down converters for the fabrication of white light-emitting diodes (LEDs). Electroluminescent properties of white QD-LEDs depending on Mn concentration of CGS:Mn/ZnS QDs and forward current are also discussed in detail.
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Affiliation(s)
- Dae-Yeon Jo
- Department of Materials Science and Engineering, Hongik University , Seoul 121-791, Korea
| | - Daekyoung Kim
- Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU) , Suwon 440-746, Korea
| | - Jong-Hoon Kim
- Department of Materials Science and Engineering, Hongik University , Seoul 121-791, Korea
| | - Heeyeop Chae
- Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU) , Suwon 440-746, Korea
| | - Hyo Jin Seo
- Department of Physics, Pukyong National University , Busan 608-737, Korea
| | - Young Rag Do
- Department of Chemistry, Kookmin University , Seoul 136-702, Korea
| | - Heesun Yang
- Department of Materials Science and Engineering, Hongik University , Seoul 121-791, Korea
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Knowles KE, Hartstein KH, Kilburn TB, Marchioro A, Nelson HD, Whitham PJ, Gamelin DR. Luminescent Colloidal Semiconductor Nanocrystals Containing Copper: Synthesis, Photophysics, and Applications. Chem Rev 2016; 116:10820-51. [DOI: 10.1021/acs.chemrev.6b00048] [Citation(s) in RCA: 233] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Kathryn E. Knowles
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Kimberly H. Hartstein
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Troy B. Kilburn
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Arianna Marchioro
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Heidi D. Nelson
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Patrick J. Whitham
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Daniel R. Gamelin
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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43
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Speranskaya ES, Sevrin C, De Saeger S, Hens Z, Goryacheva IY, Grandfils C. Synthesis of Hydrophilic CuInS2/ZnS Quantum Dots with Different Polymeric Shells and Study of Their Cytotoxicity and Hemocompatibility. ACS APPLIED MATERIALS & INTERFACES 2016; 8:7613-22. [PMID: 26963807 DOI: 10.1021/acsami.5b11258] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this work, there is a detailed description of the whole process of biocompatible CIS/ZnS QDs production. Special attention was paid to the stability of QDs against photooxidation. It was shown that Cu/In ratio greatly affected not only nanocrystals PLQYs but photostability as well. CIS/ZnS QDs with Cu/In = 1:4 ratio showed high photostability under UV illumination both in toluene and aqueous solutions. Meanwhile, photoluminescence of CIS/ZnS QDs with Cu/In = 1:1 ratio was completely quenched after several hours under UV illumination, though their initial QY was as high as 40% with peak maximum at 740 nm. QDs were transferred to water by polymer encapsulation and were subsequently modified with polyethers Jeffamines, cheap analogues of PEG-derivatives. Three types of hydrophilic QDs differing in size, PEG content, and surface charge were obtained for further investigation and comparison of their cytotoxicity and hemocompatibility. It was shown that both leucocytes size distribution and coagulation activation change after introduction of polyethers into QDs polymeric shell, while red blood cells and platelets size distribution as well as hemolysis rate did not show any different results among different QDs and the polymer itself. All three types of QDs showed only slight cytotoxicity. Confocal microscopy proves penetration of hydrophilic CIS/ZnS QDs inside cells, so the low QDs cytotoxocity cannot be explained by low cellular uptake of the QDs and indicated low QDs toxicity in general.
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Affiliation(s)
- Elena S Speranskaya
- Department of General and Inorganic Chemistry, Chemistry Institute, Saratov State University , Astrakhanskaya 83, 410012 Saratov, Russia
| | - Chantal Sevrin
- Centre Interfacultaire des Biomatériaux (CEIB), University of Liège (ULg), Chemistry Institute , B6c, Allée du 6 aout, 11, B-4000 Liège (Sart-Tilman), Belgium
| | - Sarah De Saeger
- Laboratory of Food Analysis, Faculty of Pharmaceutical Sciences, Ghent University , Ottergemsesteenweg 460, 9000 Gent, Belgium
| | - Zeger Hens
- Department of Inorganic and Physical Chemistry Ghent University , Krijgslaan 281 S3, 9000 Gent, Belgium
- Center for Nano- and Biophotonics, Ghent University , 9000 Gent, Belgium
| | - Irina Yu Goryacheva
- Department of General and Inorganic Chemistry, Chemistry Institute, Saratov State University , Astrakhanskaya 83, 410012 Saratov, Russia
- Chemistry Institute, St. Petersburg State University , Universitetsky pr. 198504, St. Petersburg, Russia
| | - Christian Grandfils
- Centre Interfacultaire des Biomatériaux (CEIB), University of Liège (ULg), Chemistry Institute , B6c, Allée du 6 aout, 11, B-4000 Liège (Sart-Tilman), Belgium
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44
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Leach ADP, Macdonald JE. Optoelectronic Properties of CuInS2 Nanocrystals and Their Origin. J Phys Chem Lett 2016; 7:572-83. [PMID: 26758860 DOI: 10.1021/acs.jpclett.5b02211] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The capacity of fluorescent colloidal semiconductor nanocrystals for commercial application has led to the development of nanocrystals with nontoxic constituent elements as replacements for the currently available Cd- and Pb-containing systems. CuInS2 is a good candidate material because of its direct band gap in the near-infrared spectral region and large optical absorption coefficient. The ternary nature, flexible stoichiometry, and different crystal structures of CuInS2 lead to a range of optoelectronic properties, which have been challenging to elucidate. In this Perspective, the optoelectronic properties of CuInS2 nanocrystals are described and what is known of their origin is discussed. We begin with an overview of their synthesis, structure, and mechanism of formation. A complete discussion of the tunable luminescence properties and the radiative decay mechanism of this system is then presented. Finally, progress toward application of these "green" nanocrystals is summarized.
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Affiliation(s)
- Alice D P Leach
- Department of Chemistry and Vanderbilt Institute of Nanoscale Science and Engineering, Vanderbilt University , Nashville, Tennessee 37235, United States
| | - Janet E Macdonald
- Department of Chemistry and Vanderbilt Institute of Nanoscale Science and Engineering, Vanderbilt University , Nashville, Tennessee 37235, United States
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45
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Jo DY, Yang H. Synthesis of highly white-fluorescent Cu–Ga–S quantum dots for solid-state lighting devices. Chem Commun (Camb) 2016; 52:709-12. [DOI: 10.1039/c5cc07968c] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly efficient, white-emitting Cu–Ga–S quantum dots are synthesized and applied as down-converters for white lighting device fabrication.
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Affiliation(s)
- Dae-Yeon Jo
- Department of Materials Science and Engineering
- Hongik University
- Republic of Korea
| | - Heesun Yang
- Department of Materials Science and Engineering
- Hongik University
- Republic of Korea
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46
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Huang G, Wang C, Xu X, Cui Y. An optical ratiometric temperature sensor based on dopant-dependent thermal equilibrium in dual-emitting Ag&Mn:ZnInS quantum dots. RSC Adv 2016. [DOI: 10.1039/c6ra06293h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel optical sensor for ratiometric temperature detection is devised via Ag&Mn:ZnInS quantum dots (QDs). The temperature can be read via the PL ratios of Ag-related and Mn-related PL intensity.
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Affiliation(s)
- Guangguang Huang
- Advanced Photonics Center
- School of Electronic Science and Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Chunlei Wang
- Advanced Photonics Center
- School of Electronic Science and Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Xiaojing Xu
- Advanced Photonics Center
- School of Electronic Science and Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Yiping Cui
- Advanced Photonics Center
- School of Electronic Science and Engineering
- Southeast University
- Nanjing
- P. R. China
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47
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Jain N, Marwaha N, Verma R, Gupta BK, Srivastava AK. Facile synthesis of defect-induced highly-luminescent pristine MgO nanostructures for promising solid-state lighting applications. RSC Adv 2016. [DOI: 10.1039/c5ra21150f] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Successful demonstration of the facile synthesis of defect-induced highly-luminescent pristine MgO nanostructures for white-light generation and proposed WLED application.
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Affiliation(s)
- Navita Jain
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110012
- India
| | - Neeraj Marwaha
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110012
- India
| | - Rajni Verma
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110012
- India
| | - Bipin Kumar Gupta
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110012
- India
| | - Avanish Kumar Srivastava
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110012
- India
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48
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Wang L, Kang X, Pan D. High color rendering index warm white light emitting diodes fabricated from AgInS2/ZnS quantum dot/PVA flexible hybrid films. Phys Chem Chem Phys 2016; 18:31634-31639. [DOI: 10.1039/c6cp06022f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A high color rendering warm-white LED is fabricated by fixing suitable thicknesses of the green and red AIS/ZnS QD/PVA luminescent films on top of a conventional blue InGaN chip.
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Affiliation(s)
- Lan Wang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Xiaojiao Kang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Daocheng Pan
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
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49
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Yuan X, Ma R, Hua J, Liu Y, Li J, Zhang W, Zhao J, Li H. Thermal stability of photoluminescence in Cu-doped Zn–In–S quantum dots for light-emitting diodes. Phys Chem Chem Phys 2016; 18:10976-82. [DOI: 10.1039/c6cp00240d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recombination between the donor–acceptor pair and/or between the host conduction band and the Cu ion state contributes to the emission of Cu:Zn–In–S QDs.
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Affiliation(s)
- Xi Yuan
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
| | - Ruixin Ma
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
| | - Jie Hua
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
| | - Yang Liu
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
| | - Ji Li
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
| | - Wenjin Zhang
- Xingzi New Material Technology Development Co., Ltd
- Shanghai 200333
- China
| | - Jialong Zhao
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
| | - Haibo Li
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
- Jilin Normal University
- Siping 136000
- China
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50
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Zhang QH, Tian Y, Wang CF, Chen S. Construction of Ag-doped Zn–In–S quantum dots toward white LEDs and 3D luminescent patterning. RSC Adv 2016. [DOI: 10.1039/c6ra05689j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The synthesis of green photoluminescent Ag-doped Zn–In–S quantum dots and their applications in patterning and white LEDs are reported.
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Affiliation(s)
- Qiu-Hong Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering
- Nanjing Tech University (the former: Nanjing University of Technology)
- Nanjing 210009
- P. R. China
| | - Yu Tian
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering
- Nanjing Tech University (the former: Nanjing University of Technology)
- Nanjing 210009
- P. R. China
| | - Cai-Feng Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering
- Nanjing Tech University (the former: Nanjing University of Technology)
- Nanjing 210009
- P. R. China
| | - Su Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering
- Nanjing Tech University (the former: Nanjing University of Technology)
- Nanjing 210009
- P. R. China
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