材料科学
钙钛矿(结构)
亚稳态
光电子学
二极管
结晶
卤化物
发光二极管
薄膜
平面的
带隙
结晶学
化学
纳米技术
无机化学
计算机图形学(图像)
有机化学
计算机科学
作者
Yiyan Song,Jing Ge,Li‐Bo Mao,Kunhua Wang,Xiaolin Tai,Qian Zhang,Li‐Ping Tang,Jing-Ming Hao,Ji‐Song Yao,Jingjing Wang,Tao Ma,Jun Yang,Yi-Feng Lan,Xue‐Chen Ru,Li‐Zhe Feng,Guozhen Zhang,Yue Lin,Qun Zhang,Hong‐Bin Yao
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2022-11-11
卷期号:8 (45)
被引量:18
标识
DOI:10.1126/sciadv.abq2321
摘要
Solution-processable all-inorganic CsPbI3-xBrx perovskite holds great potential for pure red light-emitting diodes. However, the widely existing defects in this mixed halide perovskite markedly limit the efficiency and stability of present light-emitting diode devices. We here identify that intragrain Ruddlesden-Popper planar defects are primary forms of such defects in the CsPbI3-xBrx thin film owing to the lattice strain caused by inhomogeneous halogen ion distribution. To eliminate these defects, we develop a stepwise metastable phase crystallization strategy to minimize the CsPbI3-xBrx perovskite lattice strain, which brings planar defect-free CsPbI3-xBrx thin film with improved radiative recombination, narrowed emission band, and enhanced spectral stability. Using these high-quality thin films, we fabricate spectrally stable pure red perovskite light-emitting diodes, showing 17.8% external quantum efficiency and 9000 candela meter-2 brightness with color coordinates required by Rec. 2020.
科研通智能强力驱动
Strongly Powered by AbleSci AI