题目： | Interfacial Nucleation Seeding for Electroluminescent Manipulation in Blue Perovskite Light-Emitting Diodes |
作者： | Yang Shen,1 Hai-Yan Wu,1 Yan-Qing Li, 2,* Kong-Chao Shen,1 Xingyu Gao,3 Fei Song,3 and Jian-Xin Tang1,4,* |
单位： | 1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123 , China 2School of Physics and Electronic Science, Ministry of Education Nanophotonics and Advanced Instrument, Engineering Research Center, East China Normal University, Shanghai 200241, China 3Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Chinese Academy of Sciences Shanghai, 201204, China 4Macao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa 999078, Macau SAR, China |
摘要： | Efficient and stable blue emission of perovskite light-emitting diodes (PeLEDs) is a requisite toward their potential applications in full-color displays and solid-state lighting. Rational manipulation over the entire electroluminescence process is promising to break the efficiency limit of blue PeLEDs. Herein, a facile device architecture is proposed to achieve efficient blue PeLEDs for simultaneously reducing the energetic loss during electronphoton conversion and boosting the light outcoupling. Effective interfacial engineering is employed to manipulate the perovskite crystallization nucleation, enabling highly compact perovskite nanocrystal assemblies and suppressing the trap-induced carrier losses by means of interfacial hydrogen bonding interactions. This strategy contributes to a high external quantum efficiency (EQE) of 12.8% for blue PeLEDs emitting at 486 nm as well as improved operational stability. Moreover, blue PeLEDs reach a peak EQE of 16.8% with the incorporation of internal outcoupling structures for waveguided light, which can be further raised to 27.5% by integrating a lensbased structure for substrate-mode light. These results verify the validity of this strategy in producing efficient and stable blue PeLEDs for practical applications. |
影响因子： | 16.836 |
分区情况： | 一区 |
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