Perovskite Light-Emitting Diodes with EQE Exceeding 28% through a Synergetic Dual-Additive Strategy for Defect Passivation and Nanostructure Regulation

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

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Author(s)

  • Zhe Liu
  • Weidong Qiu
  • Xiaomei Peng
  • Guanwei Sun
  • Xinyan Liu
  • Denghui Liu
  • Zhenchao Li
  • Fangru He
  • Chenyang Shen
  • Qing Gu
  • Fulong Ma
  • Lintao Hou
  • Zhengjian Qi
  • Shi-Jian Su

Detail(s)

Original languageEnglish
Article number2103268
Journal / PublicationAdvanced Materials
Volume33
Issue number43
Online published20 Sep 2021
Publication statusPublished - 28 Oct 2021
Externally publishedYes

Abstract

Quasi-2D perovskites have long been considered to have favorable “energy funnel/cascade” structures and excellent optical properties compared with their 3D counterparts. However, most quasi-2D perovskite light-emitting diodes (PeLEDs) exhibit high external quantum efficiency (EQE) but unsatisfactory operating stability due to Auger recombination induced by high current density. Herein, a synergetic dual-additive strategy is adopted to prepare perovskite films with low defect density and high environmental stability by using 18-crown-6 and poly(ethylene glycol) methyl ether acrylate (MPEG-MAA) as the additives. The dual additives containing C-O-C bonds can not only effectively reduce the perovskite defects but also destroy the self-aggregation of organic ligands, inducing the formation of perovskite nanocrystals with quasi-core/shell structure. After thermal annealing, the MPEG-MAA with its C=C bond can be polymerized to obtain a comb-like polymer, further protecting the passivated perovskite nanocrystals against water and oxygen. Finally, state-of-the-art green PeLEDs with a normal EQE of 25.2% and a maximum EQE of 28.1% are achieved, and the operating lifetime (T50) of the device in air environment is over ten times increased, providing a novel and effective strategy to make high efficiency and long operating lifetime PeLEDs.

Research Area(s)

  • defect passivation, dual additives, green perovskite light-emitting diodes, quasi-core/shell nanocrystals, stability

Citation Format(s)

Perovskite Light-Emitting Diodes with EQE Exceeding 28% through a Synergetic Dual-Additive Strategy for Defect Passivation and Nanostructure Regulation. / Liu, Zhe; Qiu, Weidong; Peng, Xiaomei; Sun, Guanwei; Liu, Xinyan; Liu, Denghui; Li, Zhenchao; He, Fangru; Shen, Chenyang; Gu, Qing; Ma, Fulong; Yip, Hin-Lap; Hou, Lintao; Qi, Zhengjian; Su, Shi-Jian.

In: Advanced Materials, Vol. 33, No. 43, 2103268, 28.10.2021.

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