Manipulating Local Lattice Distortion for Spectrally Stable and Efficient Mixed-halide Blue Perovskite LEDs

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

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Author(s)

  • Li Zhang
  • Yuanzhi Jiang
  • Yanxing Feng
  • Minghuan Cui
  • Saisai Li
  • Xinliang Fu
  • Chaochao Qin
  • Mingjian Yuan

Detail(s)

Original languageEnglish
Article numbere202302184
Journal / PublicationAngewandte Chemie - International Edition
Volume62
Issue number21
Online published3 Mar 2023
Publication statusPublished - 15 May 2023

Abstract

Mixed-halide perovskites are considered the most straightforward candidate to realize blue perovskite light-emitting diodes (PeLEDs). However, they suffer severe halide migration, leading to spectral instability, which is particularly exaggerated in high chloride alloying perovskites. Here, we demonstrate energy barrier of halide migration can be tuned by manipulating the degree of local lattice distortion (LLD). Enlarging the LLD degree to a suitable level can increase the halide migration energy barrier. We herein report an “A-site” cation engineering to tune the LLD degree to an optimal level. DFT simulation and experimental data confirm that LLD manipulation suppresses the halide migration in perovskites. Conclusively, mixed-halide blue PeLEDs with a champion EQE of 14.2 % at 475 nm have been achieved. Moreover, the devices exhibit excellent operational spectral stability (T50 of 72 min), representing one of the most efficient and stable pure-blue PeLEDs reported yet. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • Blue Emitting, Halide Migration, Mixed-Halide Perovskite, Perovskite Light-Emitting Diodes, Perovskites

Citation Format(s)

Manipulating Local Lattice Distortion for Spectrally Stable and Efficient Mixed-halide Blue Perovskite LEDs. / Zhang, Li; Jiang, Yuanzhi; Feng, Yanxing et al.
In: Angewandte Chemie - International Edition, Vol. 62, No. 21, e202302184, 15.05.2023.

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