退火(玻璃)
光电子学
二极管
发光二极管
材料科学
钙钛矿(结构)
化学
复合材料
结晶学
作者
Shuang Xu,Dengyao Tian,Xiaopeng Liang,Ruishan Wang,Wei Zhu,Shi Hu,K. Xiong,Zhi Fang,Lin Zhu,Nana Wang,Jianpu Wang
标识
DOI:10.1021/acs.jpclett.4c03143
摘要
Achieving deep-blue emission is crucial for the practical application of perovskite light-emitting diodes (LEDs) in displays. Increasing the ratio of chlorine to bromine in the perovskite is a facile method to achieve deep-blue emission. However, the low solubility of chloride in the perovskite precursor solution and the low formation energy of defects present challenges that limit device efficiency. Here, we demonstrate a chloride vapor annealing method utilizing ethylammonium chloride (EAC) to enable in situ halide exchange and defect passivation. We find that the chloride ions from EAC can effectively exchange with the bromide ions in the perovskite, resulting in blue-shifted emission. Additionally, the ammonium group in EAC can coordinate with unsaturated lead, reducing trap-assisted nonradiative recombination. Based on this approach, we achieve efficient deep-blue perovskite LEDs with a peak external quantum efficiency of 6.8% and color coordinates of (0.131, 0.044), which fully meet the Rec. 2020 blue standard.
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