Plasmon Assisted Random Lasing of Perovskite Materials*

Random lasing occurs as the result of coherent optical feedback from random scattering centers. Plasmonic nanostructures, such as silver or gold nanoparticles, efficiently scatter light due to optical confinement and the formation of hot spots at the nanoscale. In this work, by using silver nanocubes as highly efficient light scattering centers, we demonstrated a plasmon assisted random lasing of halide perovskite materials. By embedding silver nanocubes in a crystalized MAPbI3 or/and MAPbBr3 matrix, we observed narrow bandwidth lasing modes having full-widths at half-maximum of approximately 1 nm. It is observed that the lasing thresholds of perovskites are different for glass and gold substrates, and for different nanocube concentrations. Results of time-resolved measurements indicate a significant shortening in the decay time of the emission at above the lasing threshold, implying a stimulated emission process.