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. 2021 Feb;33(5):e2006697.
doi: 10.1002/adma.202006697. Epub 2020 Dec 22.

Deep-Blue Perovskite Single-Mode Lasing through Efficient Vapor-Assisted Chlorination

Joao M Pina  1 , Darshan H Parmar  1 , Golam Bappi  1 , Chun Zhou  1   2 , Hitarth Choubisa  1 , Maral Vafaie  1 , Amin M Najarian  1 , Koen Bertens  1 , Laxmi Kishore Sagar  1 , Yitong Dong  1 , Yuan Gao  1 , Sjoerd Hoogland  1 , Makhsud I Saidaminov  1 , Edward H Sargent  1
Affiliations

Deep-Blue Perovskite Single-Mode Lasing through Efficient Vapor-Assisted Chlorination

Joao M Pina et al. Adv Mater. 2021 Feb.

Abstract

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 CsPbCl3 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-2 are fabricated. This report of deep-blue perovskite single-mode lasing showcases the prospect of increasing the range of deep-blue laser sources.

Keywords: deep-blue light emission; halide exchange; lasing; perovskites; vertical-cavity surfaceemitting lasers.

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