Liu Kai-Kai, Liu Qian, Yang Dong-Wen, Liang Ya-Chuan, Sui Lai-Zhi, Wei Jian-Yong, Xue Guo-Wei, Zhao Wen-Bo, Wu Xue-Ying, Dong Lin, Shan Chong-Xin
1Henan Key Laboratory of Diamond Optoelectronic Materials and Devices, Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052 China.
2State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China.
Light Sci Appl. 2020 Mar 17;9:44. doi: 10.1038/s41377-020-0283-2. eCollection 2020.
Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr)@PbBr(OH). We note that this strategy is universal to MAPbBr, formamidine lead bromide perovskite (FAPbBr), inorganic lead bromide perovskite (CsPbBr), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.
长期以来，稳定性差一直是阻碍卤化铅钙钛矿实际应用的关键问题之一。在本文中，通过引入水，溴基钙钛矿的光致发光（PL）量子产率（QY）可从2.5%提高到71.54%，且水溶液中样品的PL QY在1年多的时间里降低极小。稳定性和PL QY的增强可归因于水诱导形成的甲基氨基溴化铅钙钛矿（MAPbBr）@PbBr(OH)。我们注意到，该策略对MAPbBr、甲脒溴化铅钙钛矿（FAPbBr）、无机溴化铅钙钛矿（CsPbBr）等具有通用性。通过将制备好的钙钛矿用作365 nm紫外芯片上的磷光体来制造发光器件（LED）。当驱动电流为200 mA时，LED的发光强度为9549 cd/m²，在LED照明下可清晰观察到玻璃表面的瑕疵。这项工作为高稳定性和高效钙钛矿提供了一种新策略。
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