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Sheng Y, Chen P, Gao Y, He Y, Li J, Muhammad, Xie X, Cheng C, Yang J, Chang Y, Tong G, Jiang Y. Tuneable Efficient White Emission of Sb 3+/Mn 2+ Co-Doped Lead-Free Perovskites for Single-Component White Light-Emitting Diodes. ACS Appl Mater Interfaces 2024; 16:19175-19183. [PMID: 38573052 DOI: 10.1021/acsami.4c00745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
Inorganic lead-free perovskite nanocrystals (NCs) with broadband self-trapped exciton (STEs) emission and low toxicity have shown enormous application prospects in the field of display and lighting. However, white light-emitting diodes (WLEDs) based on a single-component material with high photoluminescence quantum yield (PLQY) remain challenging. Here, we demonstrate a novel codoping strategy by introducing Sb3+/Mn2+ ions to achieve the tuneable dual emission in lead-free perovskite Cs3InCl6 NCs. The PLQY increases to 59.64% after doping with Sb3+. The codoped Cs3InCl6 NCs exhibit efficient white light emission due to the energy transfer channel from STEs to Mn2+ ions with PLQY of 51.38%. Density functional theory (DFT) calculations have been used to verify deeply the effects of Sb3+/Mn2+ doping. WLEDs based on Sb3+/Mn2+-codoped Cs3InCl6 NCs are explored with color rendering index of 85.5 and color coordinate of (0.398, 0.445), which have been successfully applied as photodetector lighting sources. This work provides a new perspective for designing novel lead-free perovskites to achieve single-component WLEDs.
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Affiliation(s)
- Yuanyuan Sheng
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Ping Chen
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China
| | - Yanpeng Gao
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yong He
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Junchun Li
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Muhammad
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Xiang Xie
- Jianghuai Advance Technology Center, Hefei 230000, People's Republic of China
| | - Chen Cheng
- School of Microelectronics, Hefei University of Technology, Hefei 230009, People's Republic of China
| | - Jingting Yang
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yajing Chang
- State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei 230037, People's Republic of China
| | - Guoqing Tong
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yang Jiang
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
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Liu Y, Shao X, Gao Z, Xie Q, Ying Y, Zhu X, Pan Z, Yang J, Lin H, Tang X, Chen W, Pei W, Tu Y. In situ and General Multidentate Ligand Passivation Achieves Efficient and Ultra-Stable CsPbX 3 Perovskite Quantum Dots for White Light-Emitting Diodes. Small 2024; 20:e2305664. [PMID: 37691085 DOI: 10.1002/smll.202305664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/13/2023] [Indexed: 09/12/2023]
Abstract
Inorganic CsPbX3 perovskite quantum dots (PeQDs) show great potential in white light-emitting diodes (WLEDs) due to excellent optoelectronic properties, but their practical application is hampered by low photoluminescence quantum yield (PLQY) and especially poor stability. Herein, we developed an in-situ and general multidentate ligand passivation strategy that allows for CsPbX3 PeQDs not only near-unit PLQY, but significantly improved stability against storage, heat, and polar solvent. The enhanced optical property arises from high effectiveness of the multidentate ligand, diethylenetriaminepentaacetic acid (DTPA) with five carboxyl groups, in passivating uncoordinated Pb2+ defects and suppressing nonradiative recombination. First-principles calculations reveal that the excellent stability is attributed to tridentate binding mode of DTPA that remarkably boosts the adsorption capacity to PeQD core. Finally, combining the green and red PeQDs with blue chip, we demonstrated highly luminous WLEDs with distinctly enhanced operation stability, a wide color gamut of 121.3% of national television system committee, standard white light of (0.33,0.33) in CIE 1931, and tunable color temperatures from warm to cold white light readily by emitters' ratio. This study provides an operando yet general approach to achieve efficient and stable PeQDs for WLEDs and accelerates their progress to commercialization.
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Affiliation(s)
- Yongfeng Liu
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Xiuwen Shao
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Zhaoju Gao
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Qingyu Xie
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Yupeng Ying
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Xiaolin Zhu
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Zhangcheng Pan
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Jinpeng Yang
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Hao Lin
- College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, P. R. China
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, P. R. China
| | - Xiaosheng Tang
- College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, P. R. China
- College of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chongqing, 400065, People's Republic of China
| | - Weiwei Chen
- College of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chongqing, 400065, People's Republic of China
| | - Wei Pei
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
| | - Yusong Tu
- College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, 225002, P. R. China
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3
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Xu W, Han Q, Ji C, Zeng F, Zhang X, Deng J, Shi C, Peng Z. Solid-State, Hectogram-Scale Preparation of Red Carbon Dots as Phosphor for Energy-Transfer-Induced High-Quality White LEDs with CRI of 97. Small 2023; 19:e2304123. [PMID: 37649215 DOI: 10.1002/smll.202304123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/22/2023] [Indexed: 09/01/2023]
Abstract
In this study, pre-crystallization-controlled, solid-state preparation of red carbon dots (C-dots) from o-phenylenediamine on a hectogram scale with a 94% yield is reported. Highly efficient red phosphor (C-dots@MCC) is obtained by dispersing the C-dots in microcrystalline cellulose, which matched extremely well with the commercial Y3 Al5 O12 :Ce3+ (YAG) phosphor. White light-emitting diodes (WLEDs) fabricated from the two phosphors emitted warm white light with a correlated color temperature of 3845 K, CIE color coordinates of (0.38, 0.37), and an extremely high color rendering index (CRI) of 95, outperforming all the reported YAG-derived WLEDs. Furthermore, the CRI value of the WLED can be further increased to 97 after fine-tuning, which is the highest CRI for WLEDs of any C-dots derived devices reported so far. The superior performance of the WLED is attributed to a delicate energy transfer between YAG and C-dots@MCC. Most importantly, the WLED maintained excellent stabilities under varied currents, working durations, moistures, and temperatures.
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Affiliation(s)
- Wenjun Xu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
- Electron Microscopy Center, Yunnan University, Kunming, 650091, China
| | - Qiurui Han
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Chunyu Ji
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Fanhao Zeng
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Xingshou Zhang
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Jiwen Deng
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Changsheng Shi
- Department of Physics, Key Laboratory of Yunnan Provincial Higher Education Institutions for Optoelectronics Device Engineering, Yunnan University, Kunming, 650091, China
| | - Zhili Peng
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
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Chakrabarty P, Ghorai A, Pal S, Adak D, Roy B, Ray SK, Mukherjee R. Superior white electroluminescent devices using nitrogen-doped carbon dots/TiO 2nanorods heterostructures. Nanotechnology 2023; 35:015202. [PMID: 37725943 DOI: 10.1088/1361-6528/acfb08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 09/18/2023] [Indexed: 09/21/2023]
Abstract
Nitrogen-doped carbon dots (NCDs), exhibiting strong yellow emission in aqueous solution and solid matrices, have been utilized for fabricating heterostructure white electroluminescence devices. These devices consist of nitrogen-doped carbon dots as an emissive layer sandwiched between an organic hole transport layer (PEDOT:PSS) and an array of rutile TiO2nanorods, acting as an electron transport layer. Under an applied forward bias of 5 V, the device exhibits broadband electroluminescence covering the wavelength range of 390-900 nm, resulting in pure white light emission characteristics at room temperature. The result demonstrates the successful fabrication of all solution-processed, low-cost, eco-friendly NCDs-based LEDs with CIE (Commission Internationale d'Éclairage) coordinate of (0.31, 0.34) and color rendering index (CRI) > 90, which are close to ideal white light emission characteristics. The device functionalities are achieved based on defect-related NIR emission from TiO2nanorods array and visible emission from nitrogen-doped carbon dots. This result paves a new opportunity to develop low-cost, solution-processed nitrogen-doped carbon dots based on warm White light emitting diodes with high CRI for large-area display and lighting applications.
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Affiliation(s)
- Poulomi Chakrabarty
- School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
- Instability and Soft Patterning Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
| | - Arup Ghorai
- School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
| | - Sourabh Pal
- Advanced Technology Development Center, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
| | - Deepanjana Adak
- Centre of Excellence for Green Energy and Sensor Systems, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
| | - Baidyanath Roy
- School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
| | - Samit K Ray
- School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
- Department of Physics, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
| | - Rabibrata Mukherjee
- School of Nanoscience and Technology, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
- Instability and Soft Patterning Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal, 721302, India
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5
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Hoye RLZ. Perovskite-inspired materials for energy applications. Nanotechnology 2023; 34:410201. [PMID: 37356434 DOI: 10.1088/1361-6528/ace171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 06/25/2023] [Indexed: 06/27/2023]
Abstract
Lead-halide perovskites have come to dominate the emerging photovoltaics research scene over the past decade. But whilst perovskite photovoltaics exhibit exceptional efficiencies, their limited stability, as well as the toxicity of their lead component remain challenges. This focus collection captures a snapshot of the efforts in the community to address these challenges, from modifications to the synthesis and device structure of perovskite photovoltaics to improve their stability, through to efforts to understand, develop, and improve lead-free perovskite-inspired materials (PIMs). PIMs range from direct perovskite-derivatives (e.g. CsSnI3or halide elpasolites) through to electronic analogs (e.g. BiOI). The collection discusses the application of these materials not only for solar cells, but also more broadly for photodetection, light emission, and anti-counterfeiting devices. This collection emphasizes the diversity of strategies and directions in this field, as well as its highly interdisciplinary nature.
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Affiliation(s)
- Robert L Z Hoye
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
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6
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Morozov VA, Lazoryak BI, Savina AA, Khaikina EG, Leonidov II, Ishchenko AV, Deyneko DV. Novel Red Phosphor of Gd 3+, Sm 3+ co-Activated Ag xGd ((2-x)/3)-0.3-ySm yEu 3+0.30☐ (1-2x-2y)/3WO 4 Scheelites for LED Lighting. Materials (Basel) 2023; 16:4350. [PMID: 37374533 DOI: 10.3390/ma16124350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/04/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023]
Abstract
Gd3+ and Sm3+ co-activation, the effect of cation substitutions and the creation of cation vacancies in the scheelite-type framework are investigated as factors influencing luminescence properties. AgxGd((2-x)/3)-0.3-ySmyEu3+0.3☐(1-2x)/3WO4 (x = 0.50, 0.286, 0.20; y = 0.01, 0.02, 0.03, 0.3) scheelite-type phases (AxGSyE) have been synthesized by a solid-state method. A powder X-ray diffraction study of AxGSyE (x = 0.286, 0.2; y = 0.01, 0.02, 0.03) shows that the crystal structures have an incommensurately modulated character similar to other cation-deficient scheelite-related phases. Luminescence properties have been evaluated under near-ultraviolet (n-UV) light. The photoluminescence excitation spectra of AxGSyE demonstrate the strongest absorption at 395 nm, which matches well with commercially available UV-emitting GaN-based LED chips. Gd3+ and Sm3+ co-activation leads to a notable decreasing intensity of the charge transfer band in comparison with Gd3+ single-doped phases. The main absorption is the 7F0 → 5L6 transition of Eu3+ at 395 nm and the 6H5/2 → 4F7/2 transition of Sm3+ at 405 nm. The photoluminescence emission spectra of all the samples indicate intense red emission due to the 5D0 → 7F2 transition of Eu3+. The intensity of the 5D0 → 7F2 emission increases from ~2 times (x = 0.2, y = 0.01 and x = 0.286, y = 0.02) to ~4 times (x = 0.5, y = 0.01) in the Gd3+ and Sm3+ co-doped samples. The integral emission intensity of Ag0.20Gd0.29Sm0.01Eu0.30WO4 in the red visible spectral range (the 5D0 → 7F2 transition) is higher by ~20% than that of the commercially used red phosphor of Gd2O2S:Eu3+. A thermal quenching study of the luminescence of the Eu3+ emission reveals the influence of the structure of compounds and the Sm3+ concentration on the temperature dependence and behavior of the synthesized crystals. Ag0.286Gd0.252Sm0.02Eu0.30WO4 and Ag0.20Gd0.29Sm0.01Eu0.30WO4, with the incommensurately modulated (3 + 1)D monoclinic structure, are very attractive as near-UV converting phosphors applied as red-emitting phosphors for LEDs.
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Affiliation(s)
| | - Bogdan I Lazoryak
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
| | - Aleksandra A Savina
- Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
- Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Science, 670047 Ulan-Ude, Russia
| | - Elena G Khaikina
- Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Science, 670047 Ulan-Ude, Russia
| | - Ivan I Leonidov
- Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, 620990 Ekaterinburg, Russia
| | | | - Dina V Deyneko
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, 184209 Apatity, Russia
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Chen WC, Chen LC, Liu FJ, Tsai WC, Tung BH, Venkatesan M, Tsai ML, Lin JH, Kuo CC. Perovskite-Nanocrystal-Doped Cellulose Nanocrystal Ligands for Electrospun Nanofibers with Excellent Stability. Small 2023; 19:e2207685. [PMID: 36897028 DOI: 10.1002/smll.202207685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 02/14/2023] [Indexed: 06/08/2023]
Abstract
Because of their exceptional physical and thermal properties, cellulose nanocrystals (CNCs) are a highly promising bio-based material for reinforcing fillers. Studies have revealed that some functional groups from CNCs can be used as a capping ligand to coordinate with metal nanoparticles or semiconductor quantum dots during the fabrication of novel complex materials. Therefore, through CNCs ligand encapsulation and electrospinning, perovskite-NC-embedded nanofibers with exceptional optical and thermal stability are demonstrated. The results indicate that, after continuous irradiation or heat cycling, the relative photoluminescence (PL) emission intensity of the CNCs-capped perovskite-NC-embedded nanofibers is maintained at ≈90%. However, the relative PL emission intensity of both ligand-free and long-alkyl-ligand-doped perovskite-NC-embedded nanofibers decrease to almost 0%. These results are attributable to the formation of specific clusters of perovskite NCs along with the CNCs structure and thermal property improvement of polymers. CNCs-doped luminous complex materials offer a promising avenue for stability-demanding optoelectronic devices and other novel optical applications.
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Affiliation(s)
- Wei-Cheng Chen
- Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, Taipei, 106, Taiwan
- Department of Chemical Engineering and Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei, 10617, Taiwan
| | - Lung-Chih Chen
- Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Fu-Jie Liu
- Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Wei-Chen Tsai
- Institute of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Bo-Han Tung
- Institute of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Manikandan Venkatesan
- Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Meng-Lin Tsai
- Institute of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan
| | - Ja-Hon Lin
- Institute of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 106, Taiwan
| | - Chi-Ching Kuo
- Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, Taipei, 106, Taiwan
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Liang D, Tan L, Lu S, Sun Z, Wang H, Cai W, Zang Z. Low-Temperature Solution Synthesis of Stable Cs 3Cu 2Br 5 Single Crystals for Visible Light Communications. ACS Appl Mater Interfaces 2023; 15:24622-24628. [PMID: 37170889 DOI: 10.1021/acsami.3c03506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Inorganic perovskites CsPbX3 (X = Cl, Br, I) have shown great potential as luminescent materials for a wide range of photoelectric devices. However, the practical use of these materials is limited due to the toxicity of lead and poor stability. Here, we present a facile low-temperature, solution-based method to synthesize lead-free and highly stable Cs3Cu2Br5 single crystals (SCs) without the use of organic solvents. Owing to the self-trapped exciton emissions, Cs3Cu2Br5 SCs exhibit a strong broadband blue emission with a high photoluminescence quantum yield (PLQY) upon 254 nm ultraviolet light excitation. In addition, the Cs3Cu2Br5 SCs show a high stability against heat, humidity, and UV light. Therefore, the Cs3Cu2Br5 SCs are utilized as emitters in white light emitting diodes (WLEDs), demonstrating a high color rendering index of 81 and a decent commission internationale de l'Eclairage coordinate of (0.30, 0.34). Furthermore, the prepared WLEDs are used in wireless visible light communications, showing a -3 dB bandwidth of 6.7 MHz and an achievable data rate of 45 Mbps. Our study provides a novel organic-solvent-free, low-temperature method to synthesize Cs3Cu2Br5 SCs and could promote the development of Cu-based metal halides in visible light communications.
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Affiliation(s)
- Dehai Liang
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
| | - Lin Tan
- Chengdu Product Quality Supervision, Inspection and Research Institute, Chengdu 610100, China
| | - Shirong Lu
- Department of Material Science and Technology, Taizhou University, Taizhou 318000, China
| | - Zhe Sun
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
| | - Huaxin Wang
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
| | - Wensi Cai
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
| | - Zhigang Zang
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
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9
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Yan Z, Chen T, Yan L, Liu X, Zheng J, Ren F, Yang Y, Liu B, Liu X, Xu B. One-Step Synthesis of White-Light-Emitting Carbon Dots for White LEDs with a High Color Rendering Index of 97. Adv Sci (Weinh) 2023; 10:e2206386. [PMID: 36815394 PMCID: PMC10131834 DOI: 10.1002/advs.202206386] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/23/2023] [Indexed: 06/18/2023]
Abstract
White-light-emitting carbon dots (WCDs) show innate advantages as phosphors in white light-emitting diodes (WLEDs). For WLEDs, the color rendering index (CRI) is the most important metric to evaluate its performance. Herein, WCDs are prepared by a facile one-step solvothermal reaction of trimellitic acid and o-phenylenediamine. It consists of four CDs identified by column chromatography as blue, green, yellow, red, and thus white light is a superposition of these four types of light. The mixture of the four CDs undergoes Förster resonance energy transfer to induce the generation of white light. The photoluminescence of WCDs originates from the synergistic effect of carbon core and surface states. Thereinto, the carbon core states dominate in RCDs, and the increase of amide contents and degree of conjugation promote the redshift of the emission spectra, which is further confirmed by theoretical calculations. In addition, a high CRI of 97 is achieved when the WCDs are used as phosphors to fabricate WLEDs, which is almost the highest value up to now. The multicolor LEDs can also be fabricated by using the four multicolor CDs as phosphors, respectively. This work provides a novel approach to explore the rapid preparation of low-cost, high-performance WCDs and CDs-based WLEDs.
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Affiliation(s)
- Zishan Yan
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
| | - Tong Chen
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
| | - Lingpeng Yan
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
- College of Materials Science and EngineeringTaiyuan University of Technology030024TaiyuanP. R. China
| | - Xinghua Liu
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- College of Materials Science and EngineeringTaiyuan University of Technology030024TaiyuanP. R. China
| | - Jingxia Zheng
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
| | - Fu‐de Ren
- School of Chemical Engineering and TechnologyNorth University of China030051TaiyuanP. R. China
| | - Yongzhen Yang
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
| | - Bin Liu
- School of Energy and Power EngineeringNorth University of China030051TaiyuanP. R. China
- School of Chemical Engineering and TechnologyNorth University of China030051TaiyuanP. R. China
| | - Xuguang Liu
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- College of Materials Science and EngineeringTaiyuan University of Technology030024TaiyuanP. R. China
| | - Bingshe Xu
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
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10
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Islas-Rodriguez N, Muñoz R, Rodriguez JA, Vazquez-Garcia RA, Reyes M. Integration of ternary I-III-VI quantum dots in light-emitting diodes. Front Chem 2023; 11:1106778. [PMID: 37035113 PMCID: PMC10076594 DOI: 10.3389/fchem.2023.1106778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 03/13/2023] [Indexed: 04/11/2023] Open
Abstract
Ternary I-III-VI quantum dots (TQDs) are semiconductor nanomaterials that have been gradually incorporated in the fabrication of light-emitting diodes (LEDs) over the last 10 years due to their physicochemical and photoluminescence properties, such as adequate quantum yield values, tunable wavelength emission, and easy synthesis strategies, but mainly because of their low toxicity that allows them to be excellent candidates to compete with conventional Cd-Pb-based QDs. This review addresses the different strategies to obtain TQDs and how synthesis conditions influence their physicochemical properties, followed by the LEDs parameters achieved using TQDs. The second part of the review summarizes how TQDs are integrated into LEDs and white light-emitting diodes (WLEDs). Furthermore, an insight into the state-of-the-art LEDs development using TQDs, including its advantages and disadvantages and the challenges to overcome, is presented at the end of the review.
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Affiliation(s)
- Nery Islas-Rodriguez
- Universidad Autonoma del Estado de Hidalgo (UAEH). Area Academica de Ciencias de La Tierra y Materiales, Hgo, Mexico
| | - Raybel Muñoz
- Universidad Autonoma del Estado de Hidalgo (UAEH). Area Academica de Quimica, Hidalgo, Mineral de la Reforma, Mexico
| | - Jose A. Rodriguez
- Universidad Autonoma del Estado de Hidalgo (UAEH). Area Academica de Quimica, Hidalgo, Mineral de la Reforma, Mexico
| | - Rosa A. Vazquez-Garcia
- Universidad Autonoma del Estado de Hidalgo (UAEH). Area Academica de Ciencias de La Tierra y Materiales, Hgo, Mexico
| | - Martin Reyes
- Universidad Autonoma del Estado de Hidalgo (UAEH). Area Academica de Ciencias de La Tierra y Materiales, Hgo, Mexico
- *Correspondence: Martin Reyes,
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11
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Ren Q, Zhang J, Mao Y, Molokeev MS, Zhou G, Zhang XM. Ligand Engineering Triggered Efficiency Tunable Emission in Zero-Dimensional Manganese Hybrids for White Light-Emitting Diodes. Nanomaterials (Basel) 2022; 12:3142. [PMID: 36144929 PMCID: PMC9501502 DOI: 10.3390/nano12183142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 08/26/2022] [Accepted: 09/07/2022] [Indexed: 06/16/2023]
Abstract
Zero-dimensional (0D) hybrid manganese halides have emerged as promising platforms for the white light-emitting diodes (w-LEDs) owing to their excellent optical properties. Necessary for researching on the structure-activity relationship of photoluminescence (PL), the novel manganese bromides (C13H14N)2MnBr4 and (C13H26N)2MnBr4 are reported by screening two ligands with similar atomic arrangements but various steric configurations. It is found that (C13H14N)2MnBr4 with planar configuration tends to promote a stronger electron-phonon coupling, crystal filed effect and concentration-quenching effect than (C13H26N)2MnBr4 with chair configuration, resulting in the broadband emission (FWHM = 63 nm) to peak at 539 nm with a large Stokes shift (70 nm) and a relatively low photoluminescence quantum yield (PLQY) (46.23%), which makes for the potential application (LED-1, Ra = 82.1) in solid-state lighting. In contrast, (C13H26N)2MnBr4 exhibits a narrowband emission (FWHM = 44 nm) which peaked at 515 nm with a small Stokes shift (47 nm) and a high PLQY of 64.60%, and the as-fabricated white LED-2 reaches a wide colour gamut of 107.8% National Television Standards Committee (NTSC), thus highlighting the immeasurable application prospects in solid-state display. This work clarifies the significance of the spatial configuration of organic cations in hybrids perovskites and enriches the design ideas for function-oriented low-dimensional emitters.
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Affiliation(s)
- Qiqiong Ren
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
| | - Jian Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
| | - Yilin Mao
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
| | - Maxim S. Molokeev
- Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
- Research and Development Department, Kemerovo State University, 650000 Kemerovo, Russia
- Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
| | - Guojun Zhou
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
| | - Xian-Ming Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, China
- Key Laboratory of Interface Science and Engineering in Advanced Material (Ministry of Education), College of Chemistry & Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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12
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Trapani D, Macaluso R, Crupi I, Mosca M. Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review. Materials (Basel) 2022; 15:ma15155450. [PMID: 35955386 PMCID: PMC9369759 DOI: 10.3390/ma15155450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/01/2022] [Accepted: 08/02/2022] [Indexed: 05/08/2023]
Abstract
This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow-green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results show that CDs are very promising ecofriendly candidates with the potential to replace phosphors in traditional color conversion LEDs. The future for these devices is bright, but several goals must still be achieved to reach full maturity.
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13
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Zhang F, Chen X, Qi X, Liang W, Wang M, Ma Z, Ji X, Yang D, Jia M, Wu D, Li XJ, Zhang Y, Shi Z, Shan CX. Regulating the Singlet and Triplet Emission of Sb 3+ Ions to Achieve Single-Component White-Light Emitter with Record High Color-Rendering Index and Stability. Nano Lett 2022; 22:5046-5054. [PMID: 35579571 DOI: 10.1021/acs.nanolett.2c00733] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The rapid development of solid-state lighting technology has attracted much attention for searching efficient and stable luminescent materials, especially the single-component white-light emitter. Here, we adopt a facile ion-doping technology to synthesize vacancy-ordered double perovskite Cs2ZrCl6:Sb. The introduction of Sb3+ ions with a 5s2 active lone pair into Cs2ZrCl6 host stimulates the singlet (blue) and triplet (orange) states emission of Sb3+ ions, and their relative emission intensity can be tuned through the energy transfer from singlet to triplet states. Benefiting from the dual-band emission as a pair of perfect complementary colors, the optimum Cs2ZrCl6:1.5%Sb exhibits a high-quality white emission with a color-rendering index of 96. By employing Cs2ZrCl6:1.5%Sb as the down-conversion phosphor, stable single-component white light-emitting diodes with a record half-lifetime of 2003 h were further fabricated. This study puts forward an effective ion-doping strategy to design single-component white-light emitter, making practical applications of them in lighting technologies a real possibility.
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Affiliation(s)
- Fei Zhang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Xu Chen
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Xiaofeng Qi
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Wenqing Liang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Meng Wang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Zhuangzhuang Ma
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Xinzhen Ji
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Dongwen Yang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Mochen Jia
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Di Wu
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Xin Jian Li
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Yu Zhang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Street 2699, Changchun 130012, China
| | - Zhifeng Shi
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
| | - Chong-Xin Shan
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China
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14
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Cao M, Zhao X, Gong X. Ionic Liquid-Assisted Fast Synthesis of Carbon Dots with Strong Fluorescence and Their Tunable Multicolor Emission. Small 2022; 18:e2106683. [PMID: 35038223 DOI: 10.1002/smll.202106683] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/07/2021] [Indexed: 06/14/2023]
Abstract
Conventional synthesis of carbon dots (CDs) mostly involves a hydrothermal or solvent-thermal reaction which needs relatively high temperature and pressure. In this work, ionic liquid is used to assist in fast synthesizing CDs with an ultrahigh photoluminescent quantum yield (98.5%) by heating at a low temperature (≤100 °C) and at atmospheric pressure. In addition, through this approach, tunable multicolor emissive CDs can be successfully achieved and used for preparing high-performance white light-emitting diodes. Theoretical computation proves that the activity of synthesis reaction can be significantly enhanced by ionic liquids. Density functional theory calculation reveals that the size and graphite nitrogen ratios of CDs have an effect on bandgap reduction, resulting in a redshift of the emission, which is in good agreement with the experimental results. This simple and promising approach for fast synthesis of tunable emissive CDs using ionic liquid affords the facilitation of CDs-based luminescent materials for fast manufacturing of functional devices.
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Affiliation(s)
- Mengyan Cao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Xiujian Zhao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Xiao Gong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
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15
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Liu F, Xu S, Xia P, Yang H, Qian Z, Jiang Y, Wang Z, Ban D, Wang C. Anhydride-Terminated Solid-State Carbon Dots with Bright Orange Emission Induced by Weak Excitonic Electronic Coupling. ACS Appl Mater Interfaces 2022; 14:5762-5774. [PMID: 35045698 DOI: 10.1021/acsami.1c18786] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this work, fluorescent solid carbon dots (CDs) welcome a new member, namely anhydride-terminated CDs, which have a photoluminescence quantum yield (PLQY) of 28% for orange-emitted CDs at 580 nm in powder form. For the first time, we revealed that the electronic coupling of the functional groups should be a crucial factor affecting the optical properties of solid CDs. Due to the negligible hydrogen bonding interaction between the anhydride groups, the electronic coupling of excitons between neighboring anhydride groups is weak, leading to a high PLQY of 28% and an immobile emission peak at 580 nm in solid state. Anhydride-terminated CDs can be partly converted into carboxyl-terminated CDs after dispersion in ethanol. However, the strong electronic coupling of carboxyl groups at high concentration generates the stacking mode of J-aggregates, giving rise to a red-shifted emission from 450 to 515 nm as well as quenched fluorescence in solid state. In comparison, a useful blue emission for solid-state CDs occurs from low sp2 hybridized carbon atoms, which possess weak electronic coupling and a stationary emission band at 450 nm in both solution and solid state. By adjusting the feed ratio of the reactants, the relevant intensities between the emission from low sp2 hybridized carbon atoms at 450 nm and the emission from anhydride groups at 580 nm can be controlled. As a result, single-component anhydride-terminated CD powder with tunable emission color from orange to white light can be achieved. As-prepared anhydride-terminated CDs can be used for fabricating light-emitting diodes (LEDs), white LEDs, and luminescent solar concentrators (LSCs).
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Affiliation(s)
- Fan Liu
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Shuhong Xu
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Pengfei Xia
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Hongyu Yang
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Ziting Qian
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Yuan Jiang
- Lab for Nanoelectronics and NanoDevices, Lab Department of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - Zhuyuan Wang
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Dayan Ban
- Waterloo Institute for Nanotechnology and Department of Electrical and Computer Engineering, University of Waterloo, Waterloo N2L 3G1, Ontario, Canada
| | - Chunlei Wang
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China
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16
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Zhang Y, Zhang Z, Yu W, He Y, Chen Z, Xiao L, Shi J, Guo X, Wang S, Qu B. Lead-free Double Perovskite Cs 2 AgIn 0.9 Bi 0.1 Cl 6 Quantum Dots for White Light-Emitting Diodes. Adv Sci (Weinh) 2022; 9:e2102895. [PMID: 34841731 PMCID: PMC8805553 DOI: 10.1002/advs.202102895] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/17/2021] [Indexed: 05/26/2023]
Abstract
Perovskite-based optoelectronic devices have attracted considerable attention owing to their excellent device performances and facile solution processing. However, the toxicity and intrinsic instability of lead-based perovskites have limited their commercial development. Moreover, the provision of an efficient white emission from a single perovskite layer is challenging. Here, novel electrically excited white light-emitting diodes (WLEDs) based on lead-free double perovskite Cs2 AgIn0.9 Bi0.1 Cl6 quantum dots (QDs) without any phosphor are fabricated for the first time. Density functional theory calculations are carried out to clarify the mechanism of absorption and recombination in Cs2 AgIn0.9 Bi0.1 Cl6 with Bi-doping breaking the parity-forbidden transition of the direct bandgap. Microzone optical and electronic characterizations reveal that the broadband emission of Cs2 AgIn0.9 Bi0.1 Cl6 QDs originates from self-trapped excitons, and luminescent properties are unchanged after the film deposition. The QD-WLED exhibits excellent Commission Internationale de L'Eclairage color coordinates, correlated color temperature and relatively high color rendering index of (0.32, 0.32), 6432 K, and 94.5, respectively. The maximum luminance of 158 cd m-2 is achieved by triphenylphosphine oxide passivation, and this lead-free QD-WLED exhibits a superior stability in ambient air with a long T50 ≈48.53 min. Therefore, lead-free perovskite Cs2 AgIn0.9 Bi0.1 Cl6 QDs are promising candidates for use in WLEDs in the future.
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Affiliation(s)
- Yuqing Zhang
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Zehao Zhang
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Wenjin Yu
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Yong He
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Zhijian Chen
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Lixin Xiao
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Jun‐jie Shi
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Xuan Guo
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
- Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of EducationFujian Provincial Key Laboratory for Photonics TechnologyFujian Normal UniversityFuzhou350007P. R. China
| | - Shufeng Wang
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
| | - Bo Qu
- State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsDepartment of PhysicsPeking UniversityBeijing100871P. R. China
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17
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Chen J, Xiang H, Wang J, Wang R, Li Y, Shan Q, Xu X, Dong Y, Wei C, Zeng H. Perovskite White Light Emitting Diodes: Progress, Challenges, and Opportunities. ACS Nano 2021; 15:17150-17174. [PMID: 34758267 DOI: 10.1021/acsnano.1c06849] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
As global warming, energy shortages, and environment pollution have intensified, low-carbon and energy-saving lighting technology has attracted great attention worldwide. Light emitting diodes (LEDs) have been around for decades and are considered to be the most ideal lighting technology currently due to their high luminescence efficiency (LE) and long lifespan. Besides, along with the development of modern technology, lighting technologies with higher performance and more functions are desired. Perovskite based LEDs (PeLEDs) have recently emerged as ideal candidates for lighting technology owing to the extraordinary photoelectric properties of perovskite, such as high photoluminescence quantum yields (PLQYs), easy wavelength tuning, and low-cost synthesis. Herein, we open this review by introducing the background of white LEDs (WLEDs), including their light-emitting mechanism, typical characteristics, and key indicators in applications. Then, four main approaches to fabricate WLEDs are discussed and compared. After that, in accordance with the four categories, we focus on the recent progress of white PeLEDs (Pe-WLEDs), followed by the challenges and opportunities for Pe-WLEDs in practical application. Meanwhile, some pertinent countermeasures to their challenges are put forward. Finally, the development promise of Pe-WLEDs is explored.
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Affiliation(s)
- Jiawei Chen
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Hengyang Xiang
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jian Wang
- Department of Chemistry, University of Washington, Seattle, Washington 98195-2120, United States
| | - Run Wang
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yan Li
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Qingsong Shan
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiaobao Xu
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yuhui Dong
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Changting Wei
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Haibo Zeng
- MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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18
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Lin H, Wei Q, Ng KW, Dong JY, Li JL, Liu WW, Yan SS, Chen S, Xing GC, Tang XS, Tang ZK, Wang SP. Stable and Efficient Blue-Emitting CsPbBr 3 Nanoplatelets with Potassium Bromide Surface Passivation. Small 2021; 17:e2101359. [PMID: 34121319 DOI: 10.1002/smll.202101359] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 04/08/2021] [Indexed: 05/14/2023]
Abstract
Colloidal all-inorganic perovskites nanocrystals (NCs) have emerged as a promising material for display and lighting due to their excellent optical properties. However, blue emissive NCs usually suffer from low photoluminescence quantum yields (PLQYs) and poor stability, rendering them the bottleneck for full-color all-perovskite optoelectronic applications. Herein, a facile approach is reported to enhance the emission efficiency and stability of blue emissive perovskite nano-structures via surface passivation with potassium bromide. By adding potassium oleate and excess PbBr2 to the perovskite precursor solutions, potassium bromide-passivated (KBr-passivated) blue-emitting (≈450 nm) CsPbBr3 nanoplatelets (NPLs) is successfully synthesized with a respectably high PLQY of 87%. In sharp contrast to most reported perovskite NPLs, no shifting in emission wavelength is observed in these passivated NPLs even after prolonged exposures to intense irradiations and elevated temperature, clearly revealing their excellent photo- and thermal-stabilities. The enhancements are attributed to the formation of K-Br bonding on the surface which suppresses ion migration and formation of Br-vacancies, thus improving both the PL emission and stability of CsPbBr3 NPLs. Furthermore, all-perovskite white light-emitting diodes (WLEDs) are successfully constructed, suggesting that the proposed KBr-passivated strategy can promote the development of the perovskite family for a wider range of optoelectronic applications.
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Affiliation(s)
- Hao Lin
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
- Key Laboratory of Optoelectronic Technology & Systems, (Ministry of Education), Chongqing University, Chongqing, 400044, China
| | - Qi Wei
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Kar Wei Ng
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Jia-Yi Dong
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Jie-Lei Li
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Wei-Wei Liu
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Shan-Shan Yan
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Shi Chen
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Gui-Chuan Xing
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Xiao-Sheng Tang
- Key Laboratory of Optoelectronic Technology & Systems, (Ministry of Education), Chongqing University, Chongqing, 400044, China
| | - Zi-Kang Tang
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
| | - Shuang-Peng Wang
- Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR, 999078, China
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19
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Erol E, Vahedigharehchopogh N, Kıbrıslı O, Ersundu MÇ, Ersundu AE. Recent progress in lanthanide-doped luminescent glasses for solid-state lighting applications-a review. J Phys Condens Matter 2021; 33:483001. [PMID: 34469874 DOI: 10.1088/1361-648x/ac22d9] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 09/01/2021] [Indexed: 06/13/2023]
Abstract
Nowadays, solid-state white light-emitting diodes (wLEDs) have attracted remarkable attention for applications in general lighting, displays and numerous electronical devices due to their eminent efficiency, longer lifetime and higher mechanical durability compared to traditional incandescent and fluorescent lights. In current commercial wLEDs, a combination of Y3Al5O12:Ce3+yellow phosphor with blue LED chip and epoxy resin is generally used to generate white light. However, there are some considerable frailties mostly originated from phosphor and resin such as, degradation upon heat, and moisture, inhomogeneous spectral distribution, and poor color rendering capability. Therefore, phosphor embedded glass-ceramics have been developed as a promising way to obtain durable solid-state lighting devices. However, in these methods, there is a greater risk of reactions between the phosphor material and the glass host. At this point, lanthanide-doped luminescent glasses have drawn great attention as a new generation phosphor and/or epoxy free white-light-emitting source owing to their favorable properties including high thermal and chemical stability, high transparency, and easy manufacturing process. This review article aims to comprehensively summarize the recent progress in singly (i.e., Dy3+, Eu2+), doubly (i.e., Dy3+/Eu3+, Dy3+/Tm3+, Dy3+/Ce3+, Ce3+/Sm3+, Ce3+/Tb3+) and triply (i.e., Ce3+/Tb3+/Mn2+, Eu3+/Tb3+/Tm3+, Ce3+/Tb3+/Eu3+, Tm3+/Tb3+/Sm3+, Ce3+/Dy3+/Eu3+, Ho3+/Tm3+/Yb3+, Er3+/Tm3+/Yb3+) lanthanide-doped glasses for solid-state lighting applications through down-shifting and up-conversion emissions. Theoretical background including energy transfer mechanisms, glass synthesis methods, radiative and colorimetric properties are given in details. Finally, various effective strategies are highlighted that minimize the critical challenges associated with lanthanides-such as providing energy transfer from quantum dots or nanoparticles to lanthanides, and doping lanthanides in low phonon energy glass-to improve the white light emission of luminescent glasses and broaden their application areas.
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Affiliation(s)
- Erdinç Erol
- Yildiz Technical University, Faculty of Chemical and Metallurgical Engineering, Department of Metallurgical and Materials Engineering, Glass Research and Development Laboratory, Istanbul, 34220, Turkey
- Manisa Celal Bayar University, Department of Metallurgical and Materials Engineering, Muradiye, Manisa, Turkey
| | - Naji Vahedigharehchopogh
- Yildiz Technical University, Faculty of Chemical and Metallurgical Engineering, Department of Metallurgical and Materials Engineering, Glass Research and Development Laboratory, Istanbul, 34220, Turkey
| | - Orhan Kıbrıslı
- Yildiz Technical University, Faculty of Chemical and Metallurgical Engineering, Department of Metallurgical and Materials Engineering, Glass Research and Development Laboratory, Istanbul, 34220, Turkey
| | - Miray Çelikbilek Ersundu
- Yildiz Technical University, Faculty of Chemical and Metallurgical Engineering, Department of Metallurgical and Materials Engineering, Glass Research and Development Laboratory, Istanbul, 34220, Turkey
| | - Ali Erçin Ersundu
- Yildiz Technical University, Faculty of Chemical and Metallurgical Engineering, Department of Metallurgical and Materials Engineering, Glass Research and Development Laboratory, Istanbul, 34220, Turkey
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Vu THQ, Doan TT, Jain B, Velpula RT, Pham TCT, Nguyen HPT, Nguyen HD. Improving Color Quality of Nanowire White Light-Emitting Diodes with Mn 4+ Doped Fluoride Nanosheets. Micromachines (Basel) 2021; 12:mi12080965. [PMID: 34442587 PMCID: PMC8399484 DOI: 10.3390/mi12080965] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/09/2021] [Accepted: 08/13/2021] [Indexed: 01/02/2023]
Abstract
A two-dimensional nanostructured fluoride red-emitting phosphor with an excellent quantum yield of ~91% is studied for cost-effective and high-color quality nanowire white light-emitting diodes (WLEDs). K2TiF6:Mn4+ phosphors are synthesized via an emulsification method using surfactants as sodium dodecyl sulphonate and oleic acid. The K2TiF6:Mn4+ phosphors in ultra-thin and nanosheet crystals are observed via scanning electron microscopy and high-resolution transmission electron microscopy. The surfactants are found to play a key role in inhibition of KTFM crystal growth process and stabilization of Mn4+ ions doping into the K2TiF6 host. The prepared phosphors exhibited intensive red emission at approximately 632 nm and excellent thermal stability in the range of 300-500 K upon 460 nm light excitation. Moreover, the K2TiF6:Mn4+ nanosheets were integrated on InGaN/AlGaN nanowire WLEDs for color quality study. The results show that the nanowire WLEDs with red-emitting phosphor exhibit unprecedentedly high color rendering index ~96.4, and correlated color temperature ~4450 K.
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Affiliation(s)
- Thi Hong Quan Vu
- Institute of Chemical Technology, Vietnam Academy of Science and Technology, Ho Chi Minh City 700000, Vietnam; (T.H.Q.V.); (T.T.D.); (T.C.T.P.)
- Helen and John C. Hartmann Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (B.J.); (R.T.V.)
| | - Thi Tuyet Doan
- Institute of Chemical Technology, Vietnam Academy of Science and Technology, Ho Chi Minh City 700000, Vietnam; (T.H.Q.V.); (T.T.D.); (T.C.T.P.)
- Faculty of Materials Science, University of Science, Vietnam National University, Ho Chi Minh City 700000, Vietnam
| | - Barsha Jain
- Helen and John C. Hartmann Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (B.J.); (R.T.V.)
| | - Ravi Teja Velpula
- Helen and John C. Hartmann Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (B.J.); (R.T.V.)
| | - Tung Cao Thanh Pham
- Institute of Chemical Technology, Vietnam Academy of Science and Technology, Ho Chi Minh City 700000, Vietnam; (T.H.Q.V.); (T.T.D.); (T.C.T.P.)
| | - Hieu Pham Trung Nguyen
- Helen and John C. Hartmann Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (B.J.); (R.T.V.)
- Correspondence: (H.P.T.N.); (H.-D.N.)
| | - Hoang-Duy Nguyen
- Institute of Chemical Technology, Vietnam Academy of Science and Technology, Ho Chi Minh City 700000, Vietnam; (T.H.Q.V.); (T.T.D.); (T.C.T.P.)
- Correspondence: (H.P.T.N.); (H.-D.N.)
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21
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James Singh K, Ahmed T, Gautam P, Sadhu AS, Lien DH, Chen SC, Chueh YL, Kuo HC. Recent Advances in Two-Dimensional Quantum Dots and Their Applications. Nanomaterials (Basel) 2021; 11:1549. [PMID: 34208236 PMCID: PMC8230759 DOI: 10.3390/nano11061549] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/08/2021] [Accepted: 06/09/2021] [Indexed: 01/28/2023]
Abstract
Two-dimensional quantum dots have received a lot of attention in recent years due to their fascinating properties and widespread applications in sensors, batteries, white light-emitting diodes, photodetectors, phototransistors, etc. Atomically thin two-dimensional quantum dots derived from graphene, layered transition metal dichalcogenide, and phosphorene have sparked researchers' interest with their unique optical and electronic properties, such as a tunable energy bandgap, efficient electronic transport, and semiconducting characteristics. In this review, we provide in-depth analysis of the characteristics of two-dimensional quantum dots materials, their synthesis methods, and opportunities and challenges for novel device applications. This analysis will serve as a tipping point for learning about the recent breakthroughs in two-dimensional quantum dots and motivate more scientists and engineers to grasp two-dimensional quantum dots materials by incorporating them into a variety of electrical and optical fields.
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Affiliation(s)
- Konthoujam James Singh
- Department of Photonics & Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (A.S.S.)
| | - Tanveer Ahmed
- Department of Electrical Engineering and Computer Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (T.A.); (D.-H.L.)
| | - Prakalp Gautam
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan;
| | - Annada Sankar Sadhu
- Department of Photonics & Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (A.S.S.)
| | - Der-Hsien Lien
- Department of Electrical Engineering and Computer Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (T.A.); (D.-H.L.)
| | - Shih-Chen Chen
- Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan
| | - Yu-Lun Chueh
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan;
| | - Hao-Chung Kuo
- Department of Photonics & Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (A.S.S.)
- Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan
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22
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Ma Z, Shi Z, Yang D, Li Y, Zhang F, Wang L, Chen X, Wu D, Tian Y, Zhang Y, Zhang L, Li X, Shan C. High Color-Rendering Index and Stable White Light-Emitting Diodes by Assembling Two Broadband Emissive Self-Trapped Excitons. Adv Mater 2021; 33:e2001367. [PMID: 33225543 DOI: 10.1002/adma.202001367] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 08/25/2020] [Indexed: 05/06/2023]
Abstract
White light-emitting diodes (WLEDs) are promising next-generation solid-state light sources. However, the commercialization route for WLED production suffers from challenges in terms of insufficient color-rendering index (CRI), color instability, and incorporation of rare-earth elements. Herein, a new two-component strategy is developed by assembling two broadband emissive materials with self-trapped excitons (STEs) for high CRI and stable WLEDs. The strategy addresses effectively the challenging issues facing current WLEDs. Based on first-principles thermodynamic calculations, copper-based ternary halides composites, CsCu2 I3 @Cs3 Cu2 I5 , are synthesized by a facile one-step solution approach. The composites exhibit an ideal white-light emission with a cold/warm white-light tuning and a robust stability against heat, ultraviolet light, and environmental oxygen/moisture. A series of cold/warm tunable WLEDs is demonstrated with a maximum luminance of 145 cd m-2 and an external quantum efficiency of 0.15%, and a record high CRI of 91.6 is achieved, which is the highest value for lead-free WLEDs. Importantly, the fabricated device demonstrates an excellent operation stability in a continuous current mode, exhibiting a long half-lifetime of 238.5 min. The results promise the use of the hybrids of STEs-derived broadband emissive materials for high-performance WLEDs.
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Affiliation(s)
- Zhuangzhuang Ma
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Zhifeng Shi
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Dongwen Yang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Yawen Li
- State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Fei Zhang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Lintao Wang
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Xu Chen
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Di Wu
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Yongtao Tian
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Yu Zhang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Street 2699, Changchun, 130012, China
| | - Lijun Zhang
- State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Xinjian Li
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
| | - Chongxin Shan
- Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Daxue Road 75, Zhengzhou, 450052, China
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Liu Y, Yang H, Ma C, Luo S, Xu M, Wu Z, Li W, Liu S. Luminescent Transparent Wood Based on Lignin-Derived Carbon Dots as a Building Material for Dual-Channel, Real-Time, and Visual Detection of Formaldehyde Gas. ACS Appl Mater Interfaces 2020; 12:36628-36638. [PMID: 32662973 DOI: 10.1021/acsami.0c10240] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Formaldehyde (FA) is a widespread indoor air pollutant, and its efficient detection is a major industrial challenge. The development of a building material with real-time and visual self-detection of FA gas is highly desirable for meeting both construction and human health demands. Herein, a luminescent transparent wood (LTW) as the building material was developed for dual-channel, real-time, and visual detection of FA gas. It was fabricated by encapsulating multicolor lignin-derived carbon dots (CDs) and poly(vinyl alcohol) (PVA) into a delignified wood framework. It exhibited 85% optical transmittance, tunable room-temperature phosphorescence (RTP), and ratiometric fluorescence (FL) emission. The tunable luminescence was attributed to different CD graphitization and surface functionalization. The color-responsive ratiometric FL and delayed RTP detections of FA were displayed over the range of 20-1500 μM (R2 = 0.966, LOD = 1.08 nM) and 20-2000 μM (R2 = 0.977, LOD = 45.8 nM), respectively. The LTW was also used as an encapsulation film on a UV-emitting InGaN chip to form white light-emitting diodes, indicating the feasibility as an FA-responsive planar light source. The operational notion of functional LTW can expand its applications to new fields such as a stimuli-responsive light-transmitting window or planar light sources while monitoring indoor air pollutants, temperature, and humidity.
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Affiliation(s)
- Yushan Liu
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
| | - Haiyue Yang
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
| | - Chunhui Ma
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
| | - Sha Luo
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
| | - Mingcong Xu
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
| | - Zhenwei Wu
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
| | - Wei Li
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
| | - Shouxin Liu
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education, Harbin 150040, P. R. China
- Engineering Research Center of Advanced Wooden Materials, Ministry of Education, Harbin 150040, P. R. China
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Khan SU, Khan WU, Khan WU, Khan D, Saeed S, Badshah S, Ikram M, Saleh TA. Eu 3+ , Sm 3+ Deep-Red Phosphors as Novel Materials for White Light-Emitting Diodes and Simultaneous Performance Enhancement of Organic-Inorganic Perovskite Solar Cells. Small 2020; 16:e2001551. [PMID: 32459055 DOI: 10.1002/smll.202001551] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/15/2020] [Accepted: 04/21/2020] [Indexed: 06/11/2023]
Abstract
The luminous efficiency of inorganic white light-emitting diodes, to be used by the next generation as light initiators, is continuously progressing and is an emerging interest for researchers. However, low color-rendering index (Ra), high correlated color temperature (CCT), and poor stability limit its wider application. Herein, it is reported that Sm3+ - and Eu3+ -doped calcium scandate (CaSc2 O4 (CSO)) are an emerging deep-red-emitting material with promising light absorption, enhanced emission properties, and excellent thermal stability that make it a promising candidate with potential applications in emission display, solid-state white lighting, and the device performance of perovskite solar cells (PSCs). The average crystal structures of Sm3+ -doped CSO are studied by synchrotron X-ray data that correspond to an extremely rigid host structure. Samarium ion is incorporated as a sensitizer that enhances the emission intensity up to 30%, with a high color purity of 88.9% with a 6% increment. The impacts of hosting the sensitizer are studied by quantifying the lifetime curves. The CaSc2 O4 :0.15Eu3+ ,0.03Sm3+ phosphor offers significant resistance to thermal quenching. The incorporation of lanthanide ion-doped phosphors CSOE into PSCs is investigated along with their potential applications. The CSOE-coated PSCs devices exhibit a high current density and a high power conversion efficiency (15.96%) when compared to the uncoated control devices.
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Affiliation(s)
- Shahid Ullah Khan
- College of Plant Sciences and Technology, Huazhong Agricultural University, Wuhan, 430070, P. R. China
- Institute of Chemical Sciences, Gomal University, Dera Ismail Khan, Khyber Pakhtunkhwa, 29050, Pakistan
| | - Waheed Ullah Khan
- School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Wasim Ullah Khan
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Dilfaraz Khan
- Institute of Chemical Sciences, Gomal University, Dera Ismail Khan, Khyber Pakhtunkhwa, 29050, Pakistan
| | - Sumbul Saeed
- College of Plant Sciences and Technology, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Syed Badshah
- Institute of Chemical Sciences, Gomal University, Dera Ismail Khan, Khyber Pakhtunkhwa, 29050, Pakistan
| | - Muhammad Ikram
- Statistical Genomics Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Tawfik A Saleh
- Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia
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Zhang Y, Xiao J, Zhuo P, Yin H, Fan Y, Liu X, Chen Z. Carbon Dots Exhibiting Concentration-Dependent Full-Visible-Spectrum Emission for Light-Emitting Diode Applications. ACS Appl Mater Interfaces 2019; 11:46054-46061. [PMID: 31718129 DOI: 10.1021/acsami.9b14472] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Carbon dots (CDs) that exhibit emission over the whole visible spectrum are desired for use in light-emitting diodes (LEDs). Here, CDs displaying tunable fluorescence over the whole visible region are synthesized. Different concentrations of CDs are uniformly dispersed in epoxy resin and coated on 405 nm LED chips to obtain monochrome blue, cyan, green, yellow, red, and deep red LEDs that yield a color gamut covering 99.4% of the National Television Standards Committee (NTSC) standard. These monochrome LEDs display similar high stability. Furthermore, warm and neutral white LEDs are produced by coating cyan- and red-emitting CD layers on 405 nm LED chips, achieving color-rendering indexes (CRIs) of 96.4 and 96.6, respectively. Two fluorescent conversion layers derived from one material at different concentrations simplify the preparation of high-CRI white LEDs. The uniform weak changes of the cyan and red photoluminescence peaks during operation ensure the high stability of these CD-based white LEDs. This research provides a new avenue to develop low-cost, easy-to-prepare CDs with tunable emission colors as alternative phosphors for LED-based high-performance displays and lighting.
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Affiliation(s)
- Yongqiang Zhang
- Guangdong Provincial Engineering Research Center of Crystal and Laser Technology , Guangzhou 510632 , China
- Department of Optoelectronic Engineering , Jinan University , Guangzhou 510632 , China
| | - Junhao Xiao
- Guangdong Provincial Engineering Research Center of Crystal and Laser Technology , Guangzhou 510632 , China
- Department of Optoelectronic Engineering , Jinan University , Guangzhou 510632 , China
| | - Peng Zhuo
- Guangdong Provincial Engineering Research Center of Crystal and Laser Technology , Guangzhou 510632 , China
- Department of Optoelectronic Engineering , Jinan University , Guangzhou 510632 , China
| | - Hao Yin
- Guangdong Provincial Engineering Research Center of Crystal and Laser Technology , Guangzhou 510632 , China
- Department of Optoelectronic Engineering , Jinan University , Guangzhou 510632 , China
| | - Yi Fan
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics, and Physics , Chinese Academy of Sciences , Changchun 130033 , China
| | - Xingyuan Liu
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics, and Physics , Chinese Academy of Sciences , Changchun 130033 , China
| | - Zhenqiang Chen
- Guangdong Provincial Engineering Research Center of Crystal and Laser Technology , Guangzhou 510632 , China
- Department of Optoelectronic Engineering , Jinan University , Guangzhou 510632 , China
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26
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Othong J, Boonmak J, Promarak V, Kielar F, Youngme S. Sonochemical Synthesis of Carbon Dots/Lanthanoid MOFs Hybrids for White Light-Emitting Diodes with High Color Rendering. ACS Appl Mater Interfaces 2019; 11:44421-44429. [PMID: 31674176 DOI: 10.1021/acsami.9b13814] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Although lanthanoid metal-organic frameworks (Ln-MOFs) have been widely developed for white light-emitting diodes (WLEDs), the color rendering index (CRI) values are still lower than 80. To overcome this limitation, a series of CDs/Ln-MOFs hybrids, namely, CDs-2@Ln-MOF, CDs-3@Ln-MOF, and CDs-4@Ln-MOF containing blue-emitting CDs and yellow-emitting bimetallic [(Eu1.22Tb0.78(1,4-phda)3(H2O)](H2O)2 were prepared via sonication at room temperature to restrict the self-quenching of CDs in composite materials. The as-synthesized composite materials were investigated by Fourier transform infrared, powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and photoluminescence. The luminescent color of the materials can be adjusted by varying the amount of CDs and excitation wavelengths. The resulting CDs-3@Ln-MOF achieved excellent CRI up to 93 with the ideal Commission International ed'Eclairage coordinate (0.334, 0.334) and appropriate correlated color temperature (CCT) (5443 K). In addition, the tunable multicolored luminescence based on single and bimetallic EuxTb2-x(1,4-phda)3(H2O)](H2O)2, x = 0, 0.73, 1.22, 1.57, 1.94, and 2, were applied as the luminescent security inks for anti-counterfeiting application through encoding/decoding and rewritable data.
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Affiliation(s)
- Jintana Othong
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science , Khon Kaen University , Khon Kaen 40002 , Khon Kaen Province , Thailand
| | - Jaursup Boonmak
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science , Khon Kaen University , Khon Kaen 40002 , Khon Kaen Province , Thailand
| | - Vinich Promarak
- Department of Materials Science and Engineering, School of Molecular Science and Engineering , Vidyasirimedhi Institute of Science and Technology , Wangchan, Rayong 21210 , Rayong Province , Thailand
| | - Filip Kielar
- Department of Chemistry , Naresuan University , Phitsanulok 65000 , Phitsanulok Province , Thailand
| | - Sujittra Youngme
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science , Khon Kaen University , Khon Kaen 40002 , Khon Kaen Province , Thailand
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Tu S, Yin Q, Shang B, Chen M, Wu L. Stable Perovskite Quantum Dots Coated with Superhydrophobic Organosilica Shells for White Light-Emitting Diodes. Chem Asian J 2019; 14:3830-3834. [PMID: 31622024 DOI: 10.1002/asia.201901289] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Indexed: 11/06/2022]
Abstract
Metalammonium lead perovskite (MAPbX3 , MA=CH3 NH3 + ; X=Cl, Br, I) quantum dots (QDs) have attracted tremendous attention due to their outstanding optical properties. However, they usually suffer from poor stability towards water or moisture, which seriously limits their practical applications. Here, we report a simple and effective approach to improve the stability of MAPbBr3 QDs by encapsulating them with superhydrophobic fluorinated organosilica (FSiO2 ) shells. The water-resistant stability of the superhydrophobic MAPbBr3 QDs/FSiO2 is significantly enhanced and they display strong fluorescence even after immersion in water for 12 hours. This method is readily extended to prepare superhydrophobic MAPbBr2.4 Cl0.6 QDs/FSiO2 and MAPbI3 QDs/FSiO2 powders. These superhydrophobic MAPbX3 QDs/FSiO2 can be further used to fabricate white light-emitting diodes (LEDs) with comparable color to pure white emission.
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Affiliation(s)
- Shuhua Tu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, 200433, P. R. China
| | - Quanyi Yin
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, 200433, P. R. China
| | - Bin Shang
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, 200433, P. R. China
| | - Min Chen
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, 200433, P. R. China
| | - Limin Wu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, 200433, P. R. China
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Luo J, Hu M, Niu G, Tang J. Lead-Free Halide Perovskites and Perovskite Variants as Phosphors toward Light-Emitting Applications. ACS Appl Mater Interfaces 2019; 11:31575-31584. [PMID: 31424196 DOI: 10.1021/acsami.9b08407] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Lead halide perovskites have attracted tremendous research interests in the light-emitting field because of their high defect tolerance, solution processability, tunable spectrum, and efficient emission. In terms of luminescence types, both the narrowband emission derived from free-exciton (FE) and broadband white light emission from self-trapped exciton (STE) show great advantages in light-emitting applications. Despite the fascinating characteristics, their commercialization still suffers from the presence of toxic lead (Pb) and unsatisfactory stability. In this spotlight, we mainly focus on the lead-free candidates as phosphors for possible light-emitting applications. Thanks to the chemical diversity of metal halide perovskites and perovskite variants, many excellent lead-free light-emitting materials have recently been synthesized and characterized. We first classify these materials into three types according to material structures, including (1) double perovskites A2B(I)B(III)X6, (2) vacancy ordered perovskites A2B(IV)X6, (3) miscellaneous perovskite variants or halide semiconductors, which refer to halides without clear relation to the perovskite structure. We then highlight the importance of electronic dimensionality, defect passivation, and impurity doping in developing highly efficient perovskite-based emitters. We also discuss their applications in white light-emitting diodes (W-LED). Further challenges toward practical applications and potential applications are also included in a section on outlook and future challenges.
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Affiliation(s)
- Jiajun Luo
- Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Manchen Hu
- Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Guangda Niu
- Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Jiang Tang
- Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan 430074 , China
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Kim YH, Lee H, Kang SM, Bae BS. Two-Step-Enhanced Stability of Quantum Dots via Silica and Siloxane Encapsulation for the Long-Term Operation of Light-Emitting Diodes. ACS Appl Mater Interfaces 2019; 11:22801-22808. [PMID: 31190522 DOI: 10.1021/acsami.9b06987] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Despite innovative optical properties of quantum dots (QDs) for QDs-converted light-emitting diodes (QD-LEDs), the vulnerability of the QDs, against heat and moisture, has been a critical issue for commercialization and long-term use. To overcome the instabilities, we fabricated a thermally and photostable QDs-embedded silica/siloxane (S-QD/siloxane) film by embedding QDs in silica and siloxane encapsulation through a two-step sol-gel reaction. S-QDs were stably dispersed in the oligo-siloxane resin with even a QD concentration of 5 wt % without aggregation. The two-step physical barriers of silica and siloxane acted to decrease the toxicity of QDs and improve the stability against heat and moisture [85 °C/5% relative humidity (RH), 85 °C/85% RH, and 120 °C/5% RH], light (50 and 100 mA), and chemicals (ethanol, HCl, and NaOH). Our S-QD/siloxane film was applied as a color-conversion material on a blue LED chip without additional solidification and encapsulation processes for red and white QD-LEDs, exhibiting a wider color gamut (107% in CIE 1931) compared to NTSC. These enhancements indicate that our S-QD/siloxane film is a suitable material for long-term operation of QD-enhanced films and QD-LEDs in next-generation displays.
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Affiliation(s)
- Yun Hyeok Kim
- Wearable Platform Materials Technology Center Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Hyunhwan Lee
- Wearable Platform Materials Technology Center Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Seung-Mo Kang
- Wearable Platform Materials Technology Center Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Byeong-Soo Bae
- Wearable Platform Materials Technology Center Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
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Zhan Y, Shang B, Chen M, Wu L. One-Step Synthesis of Silica-Coated Carbon Dots with Controllable Solid-State Fluorescence for White Light-Emitting Diodes. Small 2019; 15:e1901161. [PMID: 31045324 DOI: 10.1002/smll.201901161] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 04/14/2019] [Indexed: 05/23/2023]
Abstract
Carbon dots (CDots)-based solid-state luminescent materials have important applications in light-emitting devices owing to their outstanding optical properties. However, it still remains a challenge to develop multiple-color-emissive solid-state CDots, due to the serious self-quenching of the CDots in the aggregation or solid state. Herein, a one-step synthesis of multiple-color-emissive solid-state silica-coated CDots (silica/CDots) composites by controlling CDots loading fraction and composite morphology to realize the adjustment of emitting color is reported. The emission of resultant silica/CDots composites shifts from blue to orange with the photoluminescence quantum yields of 57.9%, 34.3%, and 32.7% for blue, yellow, and orange emitting, respectively. Furthermore, the yellow emitting silica/CDots composites exhibit an excellent fluorescence thermal stability, and further have been applied to fabricate white-light-emitting devices with a high color rendering index of above 80.
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Affiliation(s)
- Yuan Zhan
- State Key Laboratory of Molecular Engineering of Polymers, Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China
| | - Bin Shang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China
| | - Min Chen
- State Key Laboratory of Molecular Engineering of Polymers, Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China
| | - Limin Wu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China
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31
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Feng X, Jiang K, Zeng H, Lin H. A Facile Approach to Solid-State White Emissive Carbon Dots and Their Application in UV-Excitable and Single-Component-Based White LEDs. Nanomaterials (Basel) 2019; 9:E725. [PMID: 31083426 DOI: 10.3390/nano9050725] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/05/2019] [Accepted: 05/07/2019] [Indexed: 11/16/2022]
Abstract
Large-scale applications of conventional rare-earth phosphors in white light-emitting diodes (W-LEDs) are restricted by the non-renewable raw material sources and high energy consumption during the production process. Recently, carbon dots (CDs) have been proposed as promising alternatives to rare-earth phosphors and present bright prospects in white lighting. However, the use of CDs in W-LEDs still has two major obstacles, i.e., solid-state quenching and lack of single-component white emissive products. In this work, a facile, rapid, and scalable method for the preparation of solid-state white emissive CDs (W-CDs) is reported via microwave-irradiation heating of L-aspartic acid (AA) in the presence of ammonia. The W-CDs exhibit blue photoluminescence (PL) in dilute aqueous dispersion and their emission spectra gradually broaden (emerging new emissions at orange-yellow regions) with concentration increases. Interestingly, the W-CDs powder displays a very broad PL spectrum covering nearly the whole visible-light region under ultraviolet (UV) excitation, which is responsible for the observed white emission. Further studies revealed that the self-quenching-resistance feature of the W-CDs is probably due to a covering of polymer-like structures on their surface, thus avoiding the close contact of nanoparticles with each other. PL emission of the W-CDs is reasonably ascribed to a cross-linked enhanced effect (CEE) of the sub-fluorophores contained in the material (e.g., –NH2 and C=O). Finally, applications of the W-CDs in fabricating single-component-based W-LEDs using commercially available UV chips were attempted and shown to exhibit satisfactory performances including high white light-emitting purity, high color rendering index (CRI), and tunable correlated color temperature (CCT), thus rendering great promise for W-CDs in the field of white lighting.
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Tang X, Chen W, Liu Z, Du J, Yao Z, Huang Y, Chen C, Yang Z, Shi T, Hu W, Zang Z, Chen Y, Leng Y. Ultrathin, Core-Shell Structured SiO 2 Coated Mn 2+ -Doped Perovskite Quantum Dots for Bright White Light-Emitting Diodes. Small 2019; 15:e1900484. [PMID: 30941902 DOI: 10.1002/smll.201900484] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/14/2019] [Indexed: 05/25/2023]
Abstract
All-inorganic semiconductor perovskite quantum dots (QDs) with outstanding optoelectronic properties have already been extensively investigated and implemented in various applications. However, great challenges exist for the fabrication of nanodevices including toxicity, fast anion-exchange reactions, and unsatisfactory stability. Here, the ultrathin, core-shell structured SiO2 coated Mn2+ doped CsPbX3 (X = Br, Cl) QDs are prepared via one facile reverse microemulsion method at room temperature. By incorporation of a multibranched capping ligand of trioctylphosphine oxide, it is found that the breakage of the CsPbMnX3 core QDs contributed from the hydrolysis of silane could be effectively blocked. The thickness of silica shell can be well-controlled within 2 nm, which gives the CsPbMnX3 @SiO2 QDs a high quantum yield of 50.5% and improves thermostability and water resistance. Moreover, the mixture of CsPbBr3 QDs with green emission and CsPbMnX3 @SiO2 QDs with yellow emission presents no ion exchange effect and provides white light emission. As a result, a white light-emitting diode (LED) is successfully prepared by the combination of a blue on-chip LED device and the above perovskite mixture. The as-prepared white LED displays a high luminous efficiency of 68.4 lm W-1 and a high color-rendering index of Ra = 91, demonstrating their broad future applications in solid-state lighting fields.
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Affiliation(s)
- Xiaosheng Tang
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoeletronic Engineering, Chongqing University, Chongqing, 400044, China
| | - Weiwei Chen
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoeletronic Engineering, Chongqing University, Chongqing, 400044, China
| | - Zhengzheng Liu
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Juan Du
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Zhiqiang Yao
- State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials (ICDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yi Huang
- College of Optoeletronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing, 400065, P. R. China
| | - Cheng Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Zhaoqi Yang
- School of Pharmaceutical Sciences, Jiangnan University, Jiangsu, 214122, China
| | - Tongchao Shi
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Wei Hu
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoeletronic Engineering, Chongqing University, Chongqing, 400044, China
| | - Zhigang Zang
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoeletronic Engineering, Chongqing University, Chongqing, 400044, China
| | - Yu Chen
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China
| | - Yuxin Leng
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China
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Jeong S, Oh SK, Ryou JH, Ahn KS, Song KM, Kim H. Monolithic Inorganic ZnO/GaN Semiconductors Heterojunction White Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:3761-3768. [PMID: 29319292 DOI: 10.1021/acsami.7b15946] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Monolithic light-emitting diodes (LEDs) that can generate white color at the one-chip level without the wavelength conversion through packaged phosphors or chip integration for photon recycling are of particular importance to produce compact, cost-competitive, and smart lighting sources. In this study, monolithic white LEDs were developed based on ZnO/GaN semiconductor heterojunctions. The electroluminescence (EL) wavelength of the ZnO/GaN heterojunction could be tuned by a post-thermal annealing process, causing the generation of an interfacial Ga2O3 layer. Ultraviolet, violet-bluish, and greenish-yellow broad bands were observed from n-ZnO/p-GaN without an interfacial layer, whereas a strong greenish-yellow band emission was the only one observed from that with an interfacial layer. By controlled integration of ZnO/GaN heterojunctions with different postannealing conditions, monolithic white LED was demonstrated with color coordinates in the range (0.3534, 0.3710)-(0.4197, 0.4080) and color temperatures of 4778-3349 K in the Commission Internationale de l'Eclairage 1931 chromaticity diagram. Furthermore, the monolithic white LED produced approximately 2.1 times higher optical output power than a conventional ZnO/GaN heterojunction due to the carrier confinement effect at the Ga2O3/n-ZnO interface.
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Affiliation(s)
- Seonghoon Jeong
- School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University , Jeonju 561-756, Korea
| | - Seung Kyu Oh
- Department of Mechanical Engineering, University of Houston , Houston, Texas 77204-4006, United States
| | - Jae-Hyun Ryou
- Department of Mechanical Engineering, University of Houston , Houston, Texas 77204-4006, United States
- Materials Science and Engineering Program and Texas Center for Superconductivity at UH (TcSUH), University of Houston , Houston, Texas 77204, United States
| | - Kwang-Soon Ahn
- School of Chemical Engineering, Yeungnam University , Gyeongsan 712-749, South Korea
| | - Keun Man Song
- Korea Advanced Nano Fab Center , Suwon 443-700, Republic of Korea
| | - Hyunsoo Kim
- School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University , Jeonju 561-756, Korea
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Ying W, Mao Y, Wang X, Guo Y, He H, Ye Z, Lee ST, Peng X. Solid Confinement of Quantum Dots in ZIF-8 for Efficient and Stable Color-Conversion White LEDs. ChemSusChem 2017; 10:1346-1350. [PMID: 28296052 DOI: 10.1002/cssc.201700223] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 03/10/2017] [Indexed: 06/06/2023]
Abstract
The powder form and low photoluminescence quantum yield (PLQY) of fluorescent metal-organic frameworks (MOFs) present a serious obstacle to fabricating high-efficiency film-like lighting devices. Here, we present a facile way to produce thin films of CdSex S1-x /ZnS quantum dots (QDs)@ZIF-8 with high PLQY by encapsulating red, green, and blue CdSex S1-x /ZnS QDs in ZIF-8 through a one-pot solid-confinement conversion process. The QDs@ZIF-8 thin film emits warm white light with good color quality and presents good thermal stability and long-term durability.
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Affiliation(s)
- Wen Ying
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
| | - Yiyin Mao
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
| | - Xiaobing Wang
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
| | - Yi Guo
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
| | - Haiping He
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
| | - Zhizhen Ye
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
| | - Shuit-Tong Lee
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou, Jiangsu, 215123, P.R. China
| | - Xinsheng Peng
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
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Sun C, Zhang Y, Ruan C, Yin C, Wang X, Wang Y, Yu WW. Efficient and Stable White LEDs with Silica-Coated Inorganic Perovskite Quantum Dots. Adv Mater 2016; 28:10088-10094. [PMID: 27717018 DOI: 10.1002/adma.201603081] [Citation(s) in RCA: 309] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 07/27/2016] [Indexed: 05/22/2023]
Abstract
A white light-emitting diode (0.33, 0.33) is fabricated using perovskite quantum dot/silica composites. It is shown to have greatly improved stability.
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Affiliation(s)
- Chun Sun
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Yu Zhang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Cheng Ruan
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Chunyang Yin
- National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing, 210093, China
| | - Xiaoyong Wang
- National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing, 210093, China
| | - Yiding Wang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - William W Yu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
- Department of Chemistry and Physics, Louisiana State University, Shreveport, LA, 71115, USA
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Bae WK, Lim J, Lee D, Park M, Lee H, Kwak J, Char K, Lee C, Lee S. R/G/B/natural white light thin colloidal quantum dot-based light-emitting devices. Adv Mater 2014; 26:6387-93. [PMID: 25155181 DOI: 10.1002/adma.201400139] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 04/30/2014] [Indexed: 05/24/2023]
Abstract
Bright, low-voltage driven colloidal quantum dot (QD)-based white light-emitting devices (LEDs) with practicable device performances are enabled by the direct exciton formation within quantum-dot active layers in a hybrid device structure. Detailed device characterization reveals that white-QLEDs can be rationalized as a parallel circuit, in which different QDs are connected through the same set of electrically common organic and inorganic charge transport layers.
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Affiliation(s)
- Wan Ki Bae
- Photo-Electronic Hybrids Research Center, National Agenda Research Division, Korea Institute of Science and Technology, Seoul, 136-744, Korea
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Chen HC, Chen KJ, Wang CH, Lin CC, Yeh CC, Tsai HH, Shih MH, Kuo HC, Lu TC. A novel randomly textured phosphor structure for highly efficient white light-emitting diodes. Nanoscale Res Lett 2012; 7:188. [PMID: 22424206 PMCID: PMC3315428 DOI: 10.1186/1556-276x-7-188] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 03/16/2012] [Indexed: 05/31/2023]
Abstract
We have successfully demonstrated the enhanced luminous flux and lumen efficiency in white light-emitting diodes by the randomly textured phosphor structure. The textured phosphor structure was fabricated by a simple imprinting technique, which does not need an expensive dry-etching machine or a complex patterned definition. The textured phosphor structure increases luminous flux by 5.4% and 2.5% at a driving current of 120 mA, compared with the flat phosphor and half-spherical lens structures, respectively. The increment was due to the scattering of textured surface and also the phosphor particles, leading to the enhancement of utilization efficiency of blue light. Furthermore, the textured phosphor structure has a larger view angle at the full width at half maximum (87°) than the reference LEDs.
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Affiliation(s)
- Hsin Chu Chen
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
| | - Kuo Ju Chen
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
| | - Chao Hsun Wang
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
| | - Chien Chung Lin
- Institute of Photonic System, National Chiao Tung University, 301 Gaofa 3rd Rd., Guiren Township, Tainan County, 711, Taiwan
| | - Chia Chi Yeh
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
| | - Hsin Han Tsai
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
| | - Min Hsiung Shih
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
- Research Center for Applied Sciences, Academia Sinica 128 Academia Rd., Sec 2 Nankang, Taipei, 115, Taiwan
| | - Hao Chung Kuo
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
| | - Tien Chang Lu
- Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, 300, Taiwan
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