蓝光钙钛矿发光二极管: 从材料制备到器件优化

金属卤化物钙钛矿材料凭借其低成本、高色彩饱和度、高荧光量子产率、可调的发光波长和溶液加工等特点, 在下一代平板显示和固体照明领域极具应用前景。得益于对钙钛矿材料的设计、器件结构的优化和发光机理的深刻认识, 自2014年首次观察到室温下的钙钛矿电致发光现象以来, 绿光、红光和近红外钙钛矿电致发光二极管（PeLED)的外量子效率（EQE)目前已迅速突破了20%。然而, 作为三基色之一的蓝光PeLED发展较为缓慢, 这严重制约了全彩色PeLED的发展。最近一年来, 蓝光PeLED的效率增长显著, EQE已经超过10%。本文总结了蓝光钙钛矿材料的制备和器件结构的优化, 并对未来蓝光PeLED发展方向和所面临的问题进行了讨论, 以期促进蓝光PeLED的发展。

Abstract

Metal halide perovskite materials have great application potential in the next generation flat panel display and solid state lighting, due to their unique features such as low cost, high color saturation, high photoluminescence quantum yield, tunable emission and solution processing. Since the first observation of perovskite electroluminescence at room temperature in 2014, the external quantum efficiencies(EQEs) of green, red and near-infrared perovskite light-emitting diodes(PeLED) have rapidly exceeded 20% to date. Such rapid efficiency improvement can be ascribed to the continuous optimization of perovskite materials and device structures, as well as a deeper understanding of their luminescence mechanism. Compared with green, red and near-infrared PeLEDs, the development of blue PeLED is relatively slow, which seriously restricts the development of full-color PeLEDs. In the last year, the efficiency of blue PeLED has increased significantly, and the EQE has reached over 10%. In this review, we summarize the design and preparation of blue perovskite materials and the optimization strategies of device structure for high performance PeLEDs, and the development direction and problems of blue PeLED are discussed in the end.

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王志斌, 朱晓东, 贾浩然, 谭占鳌. 蓝光钙钛矿发光二极管: 从材料制备到器件优化[J]. 发光学报, 2020, 41(8): 879. WANG Zhi-bin, ZHU Xiao-dong, JIA Hao-ran, TAN Zhan-ao. Blue Perovskite Light-emitting Diodes: from Material Preparation to Device Optimization[J]. Chinese Journal of Luminescence, 2020, 41(8): 879.

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