Hybrid Perovskite Light-Emitting Diodes Based on Perovskite Nanocrystals with Organic-Inorganic Mixed Cations
Hybrid Perovskite Light-Emitting Diodes Based on Perovskite Nanocrystals with Organic-Inorganic Mixed Cations
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DOI：
10.1002/adma.201606405
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发表时间：
2017-05-10
影响因子：
29.4
通讯作者：
Sun, Xiao Wei
中科院分区：
文献类型：
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作者：
Zhang, Xiaoli;Liu, He;Sun, Xiao Wei
近年来，具有混合阳离子的有机-无机杂化钙钛矿材料在光伏领域取得了巨大的进步，其功率转换效率显著提高，钙钛矿的稳定性也得到了改善。受此启发，本研究提出了基于FA((1-x))Cs(x)PbBr(3) (FA = CH（NH2)(2)）的混合阳离子钙钛矿纳米晶体的简易合成方法。通过对钙钛矿的形态、光学和物理化学性质的详细表征，发现钙钛矿的发射特性FA((1-x))Cs(x)PbBr(3)显著依赖于钙钛矿组成中Cs阳离子的取代含量。这些混合阳离子钙钛矿被用作发光二极管（led）的发光体。通过优化FA(0.8)Cs(0.2)PbBr(3)的组成，led表现出令人鼓舞的性能，最高亮度为55 005 cd m(-2)，电流效率为10.09 cd a（-1）。这项工作为未来优化混合阳离子钙钛矿的成分以获得高性能led提供了重要的指导。作者认为这项工作是开发明亮高效的钙钛矿led的一个新的里程碑。
Organic-inorganic hybrid perovskite materials with mixed cations have demonstrated tremendous advances in photovoltaics recently, by showing a significant enhancement of power conversion efficiency and improved perovskite stability. Inspired by this development, this study presents the facile synthesis of mixed-cation perovskite nanocrystals based on FA((1-x))Cs(x)PbBr(3) (FA = CH(NH2)(2)). By detailed characterization of their morphological, optical, and physicochemical properties, it is found that the emission property of the perovskite, FA((1-x))Cs(x)PbBr(3), is significantly dependent on the substitution content of the Cs cations in the perovskite composition. These mixed-cation perovskites are employed as light emitters in light-emitting diodes (LEDs). With an optimized composition of FA(0.8)Cs(0.2)PbBr(3), the LEDs exhibit encouraging performance with a highest reported luminance of 55 005 cd m(-2) and a current efficiency of 10.09 cd A(-1). This work provides important instructions on the future compositional optimization of mixed-cation perovskite for obtaining high-performance LEDs. The authors believe this work is a new milestone in the development of bright and efficient perovskite LEDs.