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Efficient light-emitting diodes based on oriented perovskite nanoplatelets | | Jieyuan Cui
; Yang Liu
; Yunzhou Deng
; Chen Lin
; 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
; | | Date: |
13 Jun 2020 | | Abstract: | Solution-processed planar perovskite light-emitting diodes (LEDs) promise
high-performance and cost-effective electroluminescent (EL) 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
photon outcoupling of planar LEDs. However, LEDs based on anisotropic
perovskite nanoemitters remains 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 the assembled nanostructures. Here
we demonstrate efficient EL from an in-situ grown continuous perovskite film
comprising of a monolayer of face-on oriented nanoplatelets. The ratio of
horizontal TDMs of the perovskite nanoplatelet films is ~84%, substantially
higher than that of isotropic emitters (67%). The nanoplatelet film shows a
high PLQY of ~75%. These merits enable LEDs with a peak EQE of 23.6%,
representing the most efficient perovskite LEDs. | | Source: | arXiv, 2006.7611 | | Services: | Forum | Review | PDF | Favorites | |
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