Volume 135, Issue 21 e202302184
Forschungsartikel

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

Li Zhang

Li Zhang

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071 P.R. China

These authors contributed equally to this work.

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Yuanzhi Jiang

Yuanzhi Jiang

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071 P.R. China

These authors contributed equally to this work.

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Yanxing Feng

Yanxing Feng

School of Materials Science and Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Minghuan Cui

Minghuan Cui

Henan Key Laboratory of Infrared Materials and Spectrum Measures and Applications, College of Physics and Materials Science, Henan Normal University, Xinxiang, 453000 P. R. China

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Saisai Li

Saisai Li

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071 P.R. China

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Xinliang Fu

Xinliang Fu

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071 P.R. China

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Prof. Hsien-Yi Hsu

Prof. Hsien-Yi Hsu

School of Energy and Environment & Department of Materials Science and Engineering, City University of Hong Kong, P. R. China

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Prof. Chaochao Qin

Prof. Chaochao Qin

Henan Key Laboratory of Infrared Materials and Spectrum Measures and Applications, College of Physics and Materials Science, Henan Normal University, Xinxiang, 453000 P. R. China

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Prof. Mingjian Yuan

Corresponding Author

Prof. Mingjian Yuan

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071 P.R. China

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First published: 03 March 2023
Citations: 3

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.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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