Utilization of Trapped Optical Modes for White Perovskite Light-Emitting Diodes with Efficiency over 12%

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

19 Scopus Citations
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Author(s)

  • Ziming Chen
  • Zhenchao Li
  • Zhen Chen
  • Ruoxi Xia
  • Guangruixing Zou
  • Linghao Chu
  • Shi-Jian Su
  • Junbiao Peng
  • Yong Cao

Detail(s)

Original languageEnglish
Pages (from-to)456-466
Journal / PublicationJoule
Volume5
Issue number2
Online published4 Jan 2021
Publication statusPublished - 17 Feb 2021

Abstract

The inferior light extraction efficiency (LEE), which is generally less than 20%, based on optical modeling, and the difficulty in achieving white emission are the two main challenges in the metal-halide-perovskite light-emitting diode (PeLED) field. Herein, we report a simple and efficient approach to construct high-performance white PeLEDs with much-enhanced LEE by coupling a blue PeLED with a layer of red perovskite nanocrystal (PeNC) down-converter through a rationally designed multilayer semitransparent electrode (LiF/Al/Ag/LiF). The red PeNC layer allows the extraction of the trapped waveguide mode and surface plasmon polariton mode in a blue PeLED and converts them to red emission, resulting in over 50% LEE improvement. Simultaneously, the complementary emission spectrum of blue photons and down-converting red photons contributes to a white PeLED with a high external quantum efficiency and luminance of more than 12% and approximately 2,000 cd m−2, respectively, which represent state-of-the-art results in this field.

Research Area(s)

  • evanescent fields, light extraction, optical modes, perovskite light-emitting diodes, white light

Citation Format(s)

Utilization of Trapped Optical Modes for White Perovskite Light-Emitting Diodes with Efficiency over 12%. / Chen, Ziming; Li, Zhenchao; Chen, Zhen; Xia, Ruoxi; Zou, Guangruixing; Chu, Linghao; Su, Shi-Jian; Peng, Junbiao; Yip, Hin-Lap; Cao, Yong.

In: Joule, Vol. 5, No. 2, 17.02.2021, p. 456-466.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review