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

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 approximate to 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 mu J 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.

Automated summary

A method utilizing a vapor-assisted chlorination strategy to synthesize low-dimensional CsPbCl3 thin films exhibiting deep-blue emission is reported, achieving high-quality perovskite thin films with low surface roughness and efficient charge transfer properties. This enables the fabrication of vertical-cavity surface-emitting lasers with low lasing thresholds and showcases the prospect of increasing the range of deep-blue laser sources.