Room-temperature stimulated emission from microcrystalline CsPbCl3 films

Photoluminescence from microcrystalline CsPbCl3 films prepared by crystallization from the amorphous phase is measured under N2 laser excitation. Stimulated emission due to free exciton-free exciton inelastic collision occurs not only at 77K (as reported very recently) but also at room temperature (RT). The intensity of the stimulated emission more rapidly increases with pumping intensity at RT than at 77K, although the threshold is higher at the former temperature (600kWcm−2) than at the latter (240kWcm−2). This demonstration of the stimulated emission at RT from metal halides encourages us to explore laser media in metal halides because of their material abundance.