Miao Yanfeng, Cheng Lu, Zou Wei, Gu Lianghui, Zhang Ju, Guo Qiang, Peng Qiming, Xu Mengmeng, He Yarong, Zhang Shuting, Cao Yu, Li Renzhi, Wang Nana, Huang Wei, Wang Jianpu
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816 China.
Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072 China.
Light Sci Appl. 2020 May 22;9:89. doi: 10.1038/s41377-020-0328-6. eCollection 2020.
Light-emitting diodes (LEDs) based on perovskites show great potential in lighting and display applications. However, although perovskite films with high photoluminescence quantum efficiencies are commonly achieved, the efficiencies of perovskite LEDs are largely limited by the low light out-coupling efficiency. Here, we show that high-efficiency perovskite LEDs with a high external quantum efficiency of 20.2% and an ultrahigh radiant exitance up to 114.9 mW cm can be achieved by employing the microcavity effect to enhance light extraction. The enhanced microcavity effect and light out-coupling efficiency are confirmed by the study of angle-dependent emission profiles. Our results show that both the optical and electrical properties of the device need to be optimized to achieve high-performance perovskite LEDs.
基于钙钛矿的发光二极管在照明和显示应用中展现出巨大潜力。然而，尽管通常能制备出具有高光致发光量子效率的钙钛矿薄膜，但钙钛矿发光二极管的效率在很大程度上受到低光出射耦合效率的限制。在此，我们表明通过利用微腔效应来增强光提取，可实现具有20.2%的高外量子效率和高达114.9 mW cm的超高辐射出射度的高效钙钛矿发光二极管。通过对角度相关发射分布的研究证实了增强的微腔效应和光出射耦合效率。我们的结果表明，要实现高性能的钙钛矿发光二极管，器件的光学和电学性质都需要优化。
