钙钛矿(结构)
激子
材料科学
光电子学
发光二极管
量子效率
光化学
物理
化学
结晶学
凝聚态物理
作者
Chunhua Zhu,Fang Yuan,Xiaoyun Liu,Jingrui Li,Hongzhou Dong,Chenjing Zhao,Lihe Yan,Yingjie Xu,Jinfei Dai,Jinhai Si,Bo Jiao,Zhaoxin Wu
标识
DOI:10.1021/acs.jpclett.1c03518
摘要
The role of triplet states in the interfacial energy transfer in perovskite light-emitting diodes (PeLEDs) has so far not been clarified because of the complex exciton recombination and decay dynamics. This work aims to study this issue and accordingly proposes a novel interfacial-engineering strategy for efficient sky-blue PeLEDs. To this end, bis[2-(diphenylphosphino)phenyl]ether oxide with a high triplet energy level is introduced into sky-blue PeLEDs. It effectively reduces undesirable exciton transfer from the perovskite emission layer to the electron-transport layer, largely suppresses exciton quenching at the interface, and simultaneously passivates defects at the perovskite surfaces. As a result of the multichannel energy-loss reduction, sky-blue PeLED that emits at 488 nm is achieved with a peak external quantum efficiency of 10.17% and a maximum brightness of 6728.41 cd m-2. This work thus provides indirect evidence for the triplet mechanism of blue emission of mixed-halide perovskites and sheds new light on a promising way of boosting the performance of blue PeLEDs.
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