发光二极管
材料科学
纳米晶
兴奋剂
光致发光
二极管
钙钛矿(结构)
光电子学
量子效率
相(物质)
量子点
纳米技术
结晶学
化学
有机化学
作者
Wei Shen,Jianbin Zhang,Ruimin Dong,Yanfeng Chen,Yang Liu,Shuo Chen,Zhan Su,Yujun Dai,Kun Cao,Lihui Liu,Shufen Chen,Wei Huang
出处
期刊:Research
[American Association for the Advancement of Science]
日期:2021-01-01
卷期号:2021
被引量:36
标识
DOI:10.34133/2021/9829374
摘要
α-CsPbI3 nanocrystals (NCs) with poor stability prevent their wide applications in optoelectronic fields. Ca2+ (1.00 Å) as a new B-site doping ion can successfully boost CsPbI3 NC performance with both improved phase stability and optoelectronic properties. With a Ca2+/Pb2+ ratio of 0.40%, both phase and photoluminescence (PL) stability could be greatly enhanced. Facilitated by increased tolerance factor, the cubic phase of its solid film could be maintained after 58 days in ambient condition or 4 h accelerated aging process at 120°C. The PL stability of its solution could be preserved to 83% after 147 days in ambient condition. Even using UV light to accelerate aging, the T50 of PL could boost 1.8-folds as compared to CsPbI3 NCs. Because Ca2+ doping can dramatically decrease defect densities of films and reduce hole injection barriers, the red light-emitting diodes (LEDs) exhibited about triple enhancement for maximum the external quantum efficiency (EQE) up to 7.8% and 2.2 times enhancement for half-lifetime of LED up to 85 min. We believe it is promising to further explore high-quality CsPbI3 NC LEDs via a Ca2+-doping strategy.
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