发光二极管
电致发光
材料科学
光电子学
钙钛矿(结构)
光致发光
量子效率
二极管
平面的
纳米技术
图层(电子)
化学
结晶学
计算机科学
计算机图形学(图像)
作者
Jieyuan Cui,Yang Liu,Yunzhou Deng,Lin Chen,Zhishan Fang,Chensheng Xiang,Peng Bai,Kai Du,Xiaobing Zuo,Kaichuan Wen,Shaolong Gong,Haiping He,Zhizhen Ye,Yunan Gao,He Tian,Baodan Zhao,Jianpu Wang,Yizheng Jin
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2021-10-08
卷期号:7 (41)
被引量:66
标识
DOI:10.1126/sciadv.abg8458
摘要
Solution-processed planar perovskite light-emitting diodes (LEDs) promise high-performance and cost-effective electroluminescent devices ideal for large-area display and lighting applications. Exploiting emission layers with high ratios of horizontal transition dipole moments (TDMs) is expected to boost the photon outcoupling of planar LEDs. However, LEDs based on anisotropic perovskite nanoemitters remain to be inefficient (external quantum efficiency, EQE <5%) due to the difficulties of simultaneously controlling the orientations of TDMs, achieving high photoluminescence quantum yields (PLQYs) and realizing charge balance in the films of assembled nanostructures. Here, we demonstrate efficient electroluminescence from an in situ grown perovskite film composed of a monolayer of face-on oriented nanoplatelets. The ratio of horizontal TDMs of the perovskite nanoplatelet film is ~84%, which leads to a light-outcoupling efficiency of ~31%, substantially higher than that of isotropic emitters (~23%). In consequence, LEDs with a peak EQE of 23.6% are achieved, representing highly efficient planar perovskite LEDs.
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