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

Pina, Joao M; Parmar, Darshan H; Bappi, Golam; Zhou, Chun; Choubisa, Hitarth; Vafaie, Maral; Najarian, Amin M; Bertens, Koen et al. · Adv Mater · 2021

basic_science · Level V

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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 CsPbCl<sub>3</sub>  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<sup>-2</sup>  are fabricated. This report of deep-blue perovskite single-mode lasing showcases the prospect of increasing the range of deep-blue laser sources.