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

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

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

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Abstract

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.

Original languageEnglish
Article number361
JournalNature Communications
Volume12
Issue number1
Number of pages10
ISSN2041-1723
DOIs
Publication statusPublished - 2021

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