材料科学
钙钛矿(结构)
量子效率
光电子学
二极管
折射率
各向异性
光致发光
发光二极管
电子
光学
高折射率聚合物
能量转换效率
量子产额
化学工程
物理
量子力学
工程类
荧光
作者
Shuang‐Qiao Sun,Jing‐Wen Tai,Wei He,You‐Jun Yu,Zi‐Qi Feng,Qi Sun,Kai‐Ning Tong,Kai Shi,Bochen Liu,Min Zhu,Guodan Wei,Jian Fan,Yue‐Min Xie,Liang‐Sheng Liao,Man‐Keung Fung
标识
DOI:10.1002/adma.202400421
摘要
Thanks to the extensive efforts toward optimizing perovskite crystallization properties, high-quality perovskite films with near-unity photoluminescence quantum yield are successfully achieved. However, the light outcoupling efficiency of perovskite light-emitting diodes (PeLEDs) is impeded by insufficient light extraction, which poses a challenge to the further advancement of PeLEDs. Here, an anisotropic multifunctional electron transporting material, 9,10-bis(4-(2-phenyl-1H-benzo[d]imidazole-1-yl)phenyl) anthracene (BPBiPA), with a low extraordinary refractive index (ne ) and high electron mobility is developed for fabricating high-efficiency PeLEDs. The anisotropic molecular orientations of BPBiPA can result in a low ne of 1.59 along the z-axis direction. Optical simulations show that the low ne of BPBiPA can effectively mitigate the surface plasmon polariton loss and enhance the photon extraction efficiency in waveguide mode, thereby improving the light outcoupling efficiency of PeLEDs. In addition, the high electron mobility of BPBiPA can facilitate balanced carrier injection in PeLEDs. As a result, high-efficiency green PeLEDs with a record external quantum efficiency of 32.1% and a current efficiency of 111.7 cd A-1 are obtained, which provides new inspirations for the design of electron transporting materials for high-performance PeLEDs.
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