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

• 成果类型: Article
• 署名作者: Song, Yong-Hui; Li, Bo; Wang, Zi-Jian; Tai, Xiao-Lin; Ding, Guan-Jie; Li, Zi-Du; Xu, Huaiyu; Hao, Jing-Ming; Song, Kuang-Hui; Feng, Li-Zhe; Hu, Ya-Lan; Yin, Yi-Chen; Zhu, Bai-Sheng; Zhang, Guozhen; Ju, Huanxin; Zheng, Guanhaojie; Hu, Wei; Lin, Yue; Fan, Fengjia; Yao, Hong-Bin
• 署名单位: Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Hefei National Laboratory; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; Shanghai Advanced Research Institute, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
• 刊物名称: Nature
• ISSN/ISSBN: 0028-2441
• DOI: 10.1038/s41586-025-08867-6
• 发表日期: 2025-05-08
• 关键词: light-emitting-diodes; bright

摘要

Metal-halide perovskites are promising light-emitter candidates for next-generation light-emitting diodes (LEDs)1, 2, 3, 4, 5, 6, 7-8. 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.