Optically pumped lasing in solution-processed perovskite semiconducting materials: Self-assembled Fabry–Pérot microcavity

Optically pumped lasing has been observed in solution-processed perovskite semiconducting materials, CH3NH3PbX3 (X = Cl, Br, I). Self-assembled Fabry–Perot (FP) cavities have been easily obtained by using a simple "cast-capping method", where we can obtain single-crystal-like optical cavities. The observed spectra show clear multimode lasing of the FP cavities under pulsed optical excitation. The mode intervals are well explained by the optical constants with large dispersions of the materials. The obtained refractive index around the lasing area coincides with the results in the previous reports.