Pina Joao M, Parmar Darshan H, Bappi Golam, Zhou Chun, Choubisa Hitarth, Vafaie Maral, Najarian Amin M, Bertens Koen, Sagar Laxmi Kishore, Dong Yitong, Gao Yuan, Hoogland Sjoerd, Saidaminov Makhsud I, Sargent Edward H
The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada.
Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Adv Mater. 2021 Feb;33(5):e2006697. doi: 10.1002/adma.202006697. Epub 2020 Dec 22.
Metal halide perovskites have emerged as promising candidates for solution-processed laser gain materials, with impressive performance in the green and red spectral regions. Despite exciting progress, deep-blue-an important wavelength for laser applications-remains underexplored; indeed, cavity integration and single-mode lasing from large-bandgap perovskites have yet to be achieved. Here, a vapor-assisted chlorination strategy that enables synthesis of low-dimensional CsPbCl thin films exhibiting deep-blue emission is reported. Using this approach, high-quality perovskite thin films having a low surface roughness (RMS ≈ 1.3 nm) and efficient charge transfer properties are achieved. These enable us to document low-threshold amplified spontaneous emission. Levering the high quality of the gain medium, vertical-cavity surface-emitting lasers with a low lasing threshold of 6.5 µJ cm are fabricated. This report of deep-blue perovskite single-mode lasing showcases the prospect of increasing the range of deep-blue laser sources.
金属卤化物钙钛矿已成为溶液处理激光增益材料的有前途的候选者，在绿色和红色光谱区域表现出令人印象深刻的性能。尽管取得了令人兴奋的进展，但激光应用的重要波长——深蓝仍未得到充分探索；事实上，大带隙钙钛矿的腔集成和单模激光发射尚未实现。在此，报道了一种气相辅助氯化策略，该策略能够合成具有深蓝发射的低维CsPbCl薄膜。使用这种方法，可以获得具有低表面粗糙度（RMS≈1.3nm）和高效电荷转移特性的高质量钙钛矿薄膜。这些使我们能够记录低阈值放大自发发射。利用增益介质的高质量，制造出了低激射阈值为6.5µJ cm的垂直腔面发射激光器。这份关于深蓝钙钛矿单模激光发射的报告展示了增加深蓝激光源范围的前景。
