基于钙掺杂的 CsPbI 纳米晶体的稳定高效红色钙钛矿发光二极管。
Stable and Efficient Red Perovskite Light-Emitting Diodes Based on Ca-Doped CsPbI Nanocrystals.
作者信息
Shen Wei, Zhang Jianbin, Dong Ruimin, Chen Yanfeng, Yang Liu, Chen Shuo, Su Zhan, Dai Yujun, Cao Kun, Liu Lihui, Chen Shufen, Huang Wei
机构信息
State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Frontiers Science Center for Flexible Electronics (FSCFE), MIIT Key Laboratory of Flexible Electronics (KLoFE), Northwestern Polytechnical University, Xi'an 710072, China.
出版信息
Research (Wash D C). 2021 Dec 6;2021:9829374. doi: 10.34133/2021/9829374. eCollection 2021.
-CsPbI nanocrystals (NCs) with poor stability prevent their wide applications in optoelectronic fields. Ca (1.00 Å) as a new B-site doping ion can successfully boost CsPbI NC performance with both improved phase stability and optoelectronic properties. With a Ca/Pb 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 T of PL could boost 1.8-folds as compared to CsPbI NCs. Because Ca 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 CsPbI NC LEDs via a Ca-doping strategy.
稳定性较差的 CsPbI 纳米晶体（NCs）阻碍了它们在光电子领域的广泛应用。钙（1.00 Å）作为一种新的 B 位掺杂离子，能够通过改善相稳定性和光电性能成功提升 CsPbI NC 的性能。当钙/铅比例为 0.40%时，相稳定性和光致发光（PL）稳定性都能得到极大增强。在容忍因子增加的促进下，其固体薄膜的立方相在环境条件下放置 58 天后或在 120°C 下进行 4 小时加速老化过程后仍可保持。其溶液在环境条件下放置 147 天后，PL 稳定性可保持在 83%。即使使用紫外光加速老化，与 CsPbI NCs 相比，PL 的 T 也能提高 1.8 倍。由于钙掺杂可显著降低薄膜的缺陷密度并降低空穴注入势垒，红色发光二极管（LED）的最大外量子效率（EQE）提高了约三倍，达到 7.8%，LED 半衰期提高了 2.2 倍，达到 85 分钟。我们认为，通过钙掺杂策略进一步探索高质量的 CsPbI NC LED 具有广阔前景。
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