Control of Barrier Width in Perovskite Multiple Quantum Wells for High Performance Green Light–Emitting Diodes

Maotao Yu, Chang Yi, Nana Wang, Liangdong Zhang, Renmeng Zou, Yunfang Tong, Hong Chen, Yu Cao, Yarong He, Ying Wang, Mengmeng Xu, Yang Liu, Yizheng Jin, Wei Huang, Jianpu Wang

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64 引用 (Scopus)

摘要

Solution-processed, self-organized multiple quantum well (MQW) perovskites possess good film coverage and high photoluminescence quantum efficiency, which are promising for high performance light-emitting diodes (LEDs). However, due to the inclusion of insulating large organic cation as barrier layer, the charge transport in MQW perovskites is not as efficient as 3D perovskites, which limits the improvement of power conversion efficiency of MQW perovskite LEDs. Here, it is demonstrated that by molecular engineering, the conductivity of MQW perovskite film can be effectively increased by reducing the barrier width in QWs, thus leading to enhanced device performance. By controlling the constitution of the narrow-barrier-width MQW perovskites, one can achieve green LEDs with a high luminance of 30 000 cd m−2 at a low voltage of 6 V and a peak external quantum efficiency of 7.7%. Moreover, the green perovskite LEDs show a lifetime of 63 min with initial luminance of 1330 cd m−2, representing one of the best performing green perovskite LEDs. Here, a promising strategy is provided to further boost the efficiency, brightness, and stability of MQW perovskite LEDs.

源语言英语
文章编号1801575
期刊Advanced Optical Materials
7
3
DOI
出版状态已出版 - 5 2月 2019

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