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Yu H, Liu Z, Ren Z, Yang Y, Fan Y, Xu J, Cui Y, Qin Y, Yu M, Di D, Zhao B. Improved Molecular Packing of Self-Assembled Monolayer Charge Injectors for Perovskite Light-Emitting Diodes. J Phys Chem Lett 2024; 15:6705-6711. [PMID: 38900573 DOI: 10.1021/acs.jpclett.4c01264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Self-assembled monolayers (SAMs) have shown great potential as hole injection materials for perovskite light-emitting diodes due to their low parasitic absorption and ability to adjust energy level alignment. However, the head and anchoring groups on SAM molecules with significant differences in polarity can lead to the formation of micelles in the commonly used alcoholic processing solvent, inhibiting the formation of an intact SAM. In this work, the introduction of methyl groups on carbazole in the phosphonic-acid-based SAM materials is found to facilitate energy level alignment and promote the formation of compact SAMs. The alternative molecular structure also enhances the solvent resistance of poly(9-vinylcarbazole), suppressing interfacial defect densities and nonradiative recombination processes in the emissive perovskites. PeLEDs based on the methyl-containing SAMs exhibit ∼30% enhancement in efficiency. These findings contribute to a better understanding of the design of SAM materials for PeLED applications.
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Affiliation(s)
- Huangyin Yu
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Zhe Liu
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Zhixiang Ren
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Yichen Yang
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Yangning Fan
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Jiying Xu
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Yuyang Cui
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Yajing Qin
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Minhui Yu
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Dawei Di
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Baodan Zhao
- State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
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Meng W, Wang C, Li Y, Hu G, Sui S, Xu G, Peng M, Deng Z. Synthesis of Efficient and Stable Tetrabutylammonium Copper Halides with Dual Emissions for Warm White Light-Emitting Diodes. Chemistry 2023; 29:e202202675. [PMID: 36599805 DOI: 10.1002/chem.202202675] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 12/23/2022] [Accepted: 12/27/2022] [Indexed: 01/06/2023]
Abstract
In order to achieve a high color-rendering index (CRI) and low correlated color temperature (CCT) indoor lighting, single-component phosphors with broad-band dual emission are in high demand for white-light-emitting diodes (WLEDs). However, phosphors with such fluorescent properties are rare at present. Herein, we report a facile solid-state chemical method for the synthesis of single-component phosphor with broad-band emission and a large Stokes shift that can meet the requirements of future white-light sources. These new tetrabutylammonium copper halides phosphors have excellent warm white emission characteristics, and their luminescence peaks are located at 494 and 654 nm. The optimized photoluminescence (PL) quantum yield can reach 93.7 %. The typical CIE coordinate of the as-fabricated WLED is at (0.3620, 0.3731) with a CRI of 89 and low CCT of 4516 K.
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Affiliation(s)
- Wen Meng
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Chuying Wang
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Yacong Li
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Guangcai Hu
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Shiqi Sui
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Guangyong Xu
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Min Peng
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
| | - Zhengtao Deng
- College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China
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Liu F, Liu K, Rafique S, Xu Z, Niu W, Li X, Wang Y, Deng L, Wang J, Yue X, Li T, Wang J, Ayala P, Cong C, Qin Y, Yu A, Chi N, Zhan Y. Highly Efficient and Stable Self-Powered Mixed Tin-Lead Perovskite Photodetector Used in Remote Wearable Health Monitoring Technology. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2205879. [PMID: 36494090 PMCID: PMC9929128 DOI: 10.1002/advs.202205879] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/24/2022] [Indexed: 05/11/2023]
Abstract
Realization of remote wearable health monitoring (RWHM) technology for the flexible photodiodes is highly desirable in remote-sensing healthcare systems used in space stations, oceans, and forecasting warning, which demands high external quantum efficiency (EQE) and detectivity in NIR region. Traditional inorganic photodetectors (PDs) are mechanically rigid and expensive while the widely reported solution-processed mixed tin-lead (MSP) perovskite photodetectors (PPDs) exhibit a trade-off between EQE and detectivity in the NIR region. Herein, a novel functional passivating antioxidant (FPA) strategy has been introduced for the first time to simultaneously improve crystallization, restrain Sn2+ oxidization, and reduce defects in MSP perovskite films by multiple interactions between thiophene-2-carbohydrazide (TAH) molecules and cations/anions in MSP perovskite. The resultant solution-processed rigid mixed Sn-Pb PPD simultaneously achieves high EQE (75.4% at 840 nm), detectivity (1.8 × 1012 Jones at 840 nm), ultrafast response time (trise /tfall = 94 ns/97 ns), and improved stability. This work also highlights the demonstration of the first flexible photodiode using MSP perovskite and FPA strategy with remarkably high EQE (75% at 840 nm), and operational stability. Most importantly, the RWHM is implemented for the first time in the PIN MSP perovskite photodiodes to remotely monitor the heart rate of humans at rest and after-run conditions.
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Affiliation(s)
- Fengcai Liu
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Kai Liu
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Saqib Rafique
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Zengyi Xu
- Key Laboratory for Information Science of Electromagnetic Waves (MoE)Department of Communication Science and EngineeringFudan UniversityShanghai200433P. R. China
| | - Wenqing Niu
- Key Laboratory for Information Science of Electromagnetic Waves (MoE)Department of Communication Science and EngineeringFudan UniversityShanghai200433P. R. China
| | - Xiaoguo Li
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Yifan Wang
- Key Laboratory for Information Science of Electromagnetic Waves (MoE)Department of Communication Science and EngineeringFudan UniversityShanghai200433P. R. China
| | - Liangliang Deng
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Jiao Wang
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Xiaofei Yue
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Tao Li
- Key Laboratory of Micro and Nano Photonic Structures (MOE)and Shanghai Ultra‐precision Optical Manufacturing Engineering Research CenterDepartment of Optical Science and EngineeringFudan UniversityShanghai200433P. R. China
| | - Jun Wang
- Key Laboratory of Micro and Nano Photonic Structures (MOE)and Shanghai Ultra‐precision Optical Manufacturing Engineering Research CenterDepartment of Optical Science and EngineeringFudan UniversityShanghai200433P. R. China
| | - Paola Ayala
- Faculty of PhysicsUniversity of ViennaVienna1090Austria
| | - Chunxiao Cong
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Yajie Qin
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Anran Yu
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
| | - Nan Chi
- Key Laboratory for Information Science of Electromagnetic Waves (MoE)Department of Communication Science and EngineeringFudan UniversityShanghai200433P. R. China
| | - Yiqiang Zhan
- Center for Micro Nano SystemsSchool of Information Science and Technology (SIST)Fudan UniversityShanghai200433P. R. China
- Shanghai Frontier Base of Intelligent Optoelectronics and PerceptionInstitute of OptoelectronicsFudan University2005 Songhu RoadShanghai200438P. R. China
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Bao Z, Guo X, Sun K, Ou J, Lv Y, Zou D, Li Y, Song L, Liu X. Morphology and Luminescence Regulation for CsPbBr 3 Perovskite Light-Emitting Diodes by Controlling Growth of Low-Dimensional Phases. ACS APPLIED MATERIALS & INTERFACES 2022; 14:56374-56383. [PMID: 36480696 DOI: 10.1021/acsami.2c17370] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
At present, the high defect density and strong nonradiative recombination rate of all-inorganic cesium lead bromide (CsPbBr3) perovskite light-emitting diodes (PeLEDs) seriously inhibit the improvement of their quantum efficiency. In this paper, the addition of a short-chain additive, diethylammonium bromide (DEABr), aims to control the generation of a quasi-2D large n-phase to optimize the surface morphology and construct two-dimensional/three-dimensional (2D/3D) heterojunction perovskite structures to enhance the EL efficiency of PeLEDs. Through Kelvin probe force microscopy (KPFM) characterization, we confirmed that the 2D phase grains with a low potential are locally formed on the surface of the perovskite film under the action of DEABr. The existence of the 2D phase effectively improved the surface morphology and suppressed surface defects. In addition, the in situ constructed 2D/3D heterojunction perovskite structure further increases the exciton radiative recombination rate and significantly improves the electroluminescent performance. By optimizing its doping concentration, the optimal all-inorganic PeLED displays a current efficiency (CE) of 30.3 cd A-1, an external quantum efficiency (EQE) of 9.6%, and a maximum brightness of 32,500 cd m-2. According to our results, the formation of 2D structures on the surface of the CsPbBr3 film can improve surface morphology issues and optoelectronic properties of the film.
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Affiliation(s)
- Zhiqiang Bao
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Xiaoyang Guo
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
| | - Kai Sun
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Jianfeng Ou
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Ying Lv
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
| | - Deyue Zou
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Yantao Li
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
| | - Li Song
- Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, 5340 Xiping Road, Tianjin300401, P. R. China
| | - Xingyuan Liu
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun130033, China
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