Mixed-Halide Perovskites with Halogen Bond Induced Interlayer Locking Structure for Stable Pure-Red PeLEDs

Xinliang Fu, Mei Wang*, Yuanzhi Jiang, Xiangyu Guo, Xin Zhao, Changjiu Sun, Li Zhang, Keyu Wei, Hsien-Yi Hsu, Mingjian Yuan*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

32 Citations (Scopus)

Abstract

Mixed-halide perovskites enable precise spectral tuning across the entire spectral range through composition engineering. However, mixed halide perovskites are susceptible to ion migration under continuous illumination or electric field, which significantly impedes the actual application of perovskite light-emitting diodes (PeLEDs). Here, we demonstrate a novel approach to introduce strong and homogeneous halogen bonds within the quasi-two-dimensional perovskite lattices by means of an interlayer locking structure, which effectively suppresses ion migration by increasing the corresponding activation energy. Various characterizations confirmed that intralattice halogen bonds enhance the stability of quasi-2D mixed-halide perovskite films. Here, we report that the PeLEDs exhibit an impressive 18.3% EQE with pure red emission with CIE color coordinate of (0.67, 0.33) matching Rec. 2100 standards and demonstrate an operational half-life of ∼540 min at an initial luminance of 100 cd m-2, representing one of the most stable mixed-halide pure red PeLEDs reported to date. © 2023 American Chemical Society.
Original languageEnglish
Pages (from-to)6465–6473
JournalNano Letters
Volume23
Issue number14
Online published6 Jul 2023
DOIs
Publication statusPublished - 26 Jul 2023

Research Keywords

  • Halogen bonds
  • Ion migration
  • Mixed halide
  • PeLEDs
  • Spectral stability

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