Trifluoroacetate induced small-grained CsPbBr3 perovskite films result in efficient and stable light-emitting devices

Haoran Wang, Xiaoyu Zhang, Qianqian Wu, Fan Cao, Dongwen Yang, Yuequn Shang, Zhijun Ning, Wei Zhang, Weitao Zheng, Yanfa Yan, Stephen V. Kershaw, Lijun Zhang, Andrey L. Rogach () and Xuyong Yang ()
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Haoran Wang: Shanghai University
Xiaoyu Zhang: Jilin University
Qianqian Wu: Shanghai University
Fan Cao: Shanghai University
Dongwen Yang: Jilin University
Yuequn Shang: ShanghaiTech University
Zhijun Ning: ShanghaiTech University
Wei Zhang: Jilin University
Weitao Zheng: Jilin University
Yanfa Yan: The University of Toledo
Stephen V. Kershaw: City University of Hong Kong
Lijun Zhang: Jilin University
Andrey L. Rogach: City University of Hong Kong
Xuyong Yang: Shanghai University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Quantum efficiencies of organic-inorganic hybrid lead halide perovskite light-emitting devices (LEDs) have increased significantly, but poor device operational stability still impedes their further development and application. All-inorganic perovskites show better stability than the hybrid counterparts, but the performance of their respective films used in LEDs is limited by the large perovskite grain sizes, which lowers the radiative recombination probability and results in grain boundary related trap states. We realize smooth and pinhole-free, small-grained inorganic perovskite films with improved photoluminescence quantum yield by introducing trifluoroacetate anions to effectively passivate surface defects and control the crystal growth. As a result, efficient green LEDs based on inorganic perovskite films achieve a high current efficiency of 32.0 cd A−1 corresponding to an external quantum efficiency of 10.5%. More importantly, our all-inorganic perovskite LEDs demonstrate a record operational lifetime, with a half-lifetime of over 250 h at an initial luminance of 100 cd m−2.

Date: 2019
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DOI: 10.1038/s41467-019-08425-5

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