Enhanced performance of spectra stable blue perovskite light-emitting diodes through Poly(9-vinylcarbazole) interlayer incorporation |
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| Affiliation: | 1. College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, China;2. College of Physics and Energy, Fujian Normal University, Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, 350117, China;3. College of Physics and Energy, Fujian Normal University, Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage, Fuzhou, 350117, China;1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China;2. School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;3. Centre for Advanced Analytical Science, c/o School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, PR China;1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi''an Jiaotong University, Xi''an, 710049, Shaanxi, PR China;2. School of Electrical and Control Engineering, Shaanxi University of Science and Technology, Xi''an, 710021, Shaanxi, PR China;3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, PR China;4. School of Information Science and Technology, Northwest University, Xi''an, Shannxi, 710069, PR China;1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene, Xi''an, 710072, China;2. Chongqing Innovation Center, Northwestern Polytechnical University, Chongqing, 401135, China |
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| Abstract: | Since the emergence of organic-inorganic hybrid perovskites, the development of perovskite light-emitting diodes (PeLEDs) with green/red emission have made great progress, and the corresponding external quantum efficiency (EQE) has exceeded 20%. However, the research progress of blue-emitting PeLED still has certain challenges. In this article, a multi-cation per-bromine perovskite film is prepared by introducing polymer molecules poly(9-vinylcarbazole) (PVK) in an anti-solvent (chloroform). When the concentration of PVK is optimized to 0.1 mg/mL, a smooth, dense, high-quality film with photoluminescence quantum efficiency (PLQY) up to 20.70% is obtained. The introduction of PVK can assist the formation of perovskite films for interface modification via surface defect passivation. The optimized blue PeLED has a maximum brightness of 3136 cd/m2 and a maximum EQE of 3.49% at 488 nm. More importantly, the optimized blue PeLED has excellent color stability under high applied voltage up to 12 V or continuous operation. |
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| Keywords: | Light-emitting diode Interface modification Perovskite High stability |
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