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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Mixed halide perovskites for spectrally stable and high-efficiency blue light-emitting diodes

Author

  • Max Karlsson
  • Ziyue Yi
  • Sebastian Reichert
  • Xiyu Luo
  • Weihua Lin
  • Zeyu Zhang
  • Chunxiong Bao
  • Rui Zhang
  • Sai Bai
  • Guanhaojie Zheng
  • Pengpeng Teng
  • Lian Duan
  • Yue Lu
  • Kaibo Zheng
  • Tönu Pullerits
  • Carsten Deibel
  • Weidong Xu
  • Richard Friend
  • Feng Gao

Summary, in English

Bright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying bromide/chloride composition is straightforward to achieve blue emission, practical implementation of this strategy has been challenging due to poor colour stability and severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content needed to produce blue emission. Here, we solve these critical challenges in mixed halide perovskites and demonstrate spectrally stable blue perovskite light-emitting diodes over a wide range of emission wavelengths from 490 to 451 nanometres. The emission colour is directly tuned by modifying the halide composition. Particularly, our blue and deep-blue light-emitting diodes based on three-dimensional perovskites show high EQE values of 11.0% and 5.5% with emission peaks at 477 and 467 nm, respectively. These achievements are enabled by a vapour-assisted crystallization technique, which largely mitigates local compositional heterogeneity and ion migration.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2021-12

Language

English

Publication/Series

Nature Communications

Volume

12

Issue

1

Document type

Journal article

Publisher

Nature Publishing Group

Topic

  • Physical Sciences
  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2041-1723