Photoluminescence of microcrystalline CsPbBr3 lms grown from the amorphous phase shows stimulated emission not only at cryo-3 single crystals, where no stimulated emis-sion occurs even at 4.2 K. This is the rst demonstration of room temperature stimul...
Photoluminescence of microcrystalline CsPbBr3 lms grown from the amorphous phase shows stimulated emission not only at cryo-3 single crystals, where no stimulated emis-sion occurs even at 4.2 K. This is the rst demonstration of room temperature stimulated emission from metal halide compounds.The stimulated emission is so strong that single-path-light-amplication stimulated emission across the lm thickness is observed atrelatively low threshold excitation intensities of. 50 kW cm. 2 at 77 K and . 100 kW cm. 2 at 295 K suggesting a large optical gain. Theattributable to giant oscillator strength eect characteristic of excitonic superradiance recently reported in this issue.