Intragrain 3D perovskite heterostructure for high-performance pure-red perovskite LEDs

Yong-Hui Song, Bo Li, Zi-Jian Wang, Xiao-Lin Tai, Guan-Jie Ding, Zi-Du Li, Huaiyu Xu, Jing-Ming Hao, Kuang-Hui Song, Li-Zhe Feng, Ya-Lan Hu, Yi-Chen Yin, Bai-Sheng Zhu, Guozhen Zhang, Huanxin Ju, Guanhaojie Zheng (), Wei Hu (), Yue Lin (), Fengjia Fan () and Hong-Bin Yao ()
Additional contact information
Yong-Hui Song: University of Science and Technology of China
Bo Li: University of Science and Technology of China
Zi-Jian Wang: University of Science and Technology of China
Xiao-Lin Tai: University of Science and Technology of China
Guan-Jie Ding: University of Science and Technology of China
Zi-Du Li: University of Science and Technology of China
Huaiyu Xu: University of Science and Technology of China
Jing-Ming Hao: University of Science and Technology of China
Kuang-Hui Song: University of Science and Technology of China
Li-Zhe Feng: University of Science and Technology of China
Ya-Lan Hu: University of Science and Technology of China
Yi-Chen Yin: University of Science and Technology of China
Bai-Sheng Zhu: University of Science and Technology of China
Guozhen Zhang: University of Science and Technology of China
Huanxin Ju: ULVAC-PHI Instruments Co. Ltd.
Guanhaojie Zheng: Chinese Academy of Sciences
Wei Hu: University of Science and Technology of China
Yue Lin: University of Science and Technology of China
Fengjia Fan: University of Science and Technology of China
Hong-Bin Yao: University of Science and Technology of China

Nature, 2025, vol. 641, issue 8062, 352-357

Abstract: Abstract Metal-halide perovskites are promising light-emitter candidates for next-generation light-emitting diodes (LEDs)1–8. Achieving high brightness and efficiency simultaneously in pure-red perovskite LEDs (PeLEDs) is an ongoing goal9,10. Three-dimensional (3D) CsPbI3-xBrx emitters have excellent carrier transport capability and high colour purity, which could allow efficient and ultrabright pure-red PeLEDs. However, such devices are prone to efficiency roll-off, resulting in low efficiency and low brightness under high current density. Here, by using electrically excited transient absorption spectroscopy, we discovered the efficiency roll-off was induced by hole leakage. Therefore, we developed a CsPbI3-xBrx intragrain heterostructure containing narrow bandgap emitters and wide bandgap barriers to confine the injected carriers. The wide bandgap barrier was incorporated by introducing strongly bonding molecules into the [PbX6]4− framework to expand the 3D CsPbI3-xBrx lattice. This strategy resulted in bright and efficient pure-red PeLEDs, with a high brightness of 24,600 cd m−2, maximum external quantum efficiency of 24.2% and low efficiency roll-off, maintaining a 10.5% external quantum efficiency at a high luminance of 22,670 cd m−2.

Date: 2025
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DOI: 10.1038/s41586-025-08867-6

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