Noble Metal Coating on Perovskite Microcrystals for Robust and Plasmonic Lasing Applications.

Lead halide perovskites (LHP) are solution-processible semiconductor materials with high optical gain and broad wavelength tunability, making them well-suited for laser applications. Here, we present a solution-based method for the three-dimensional conformal coating of LHP microcrystals with noble metals. A nanoscale metal coating layer was found to significantly enhance both laser performance and environmental stability. This enabled gold-coated CsPbBr microcrystals to be delivered into live cells, achieving single-mode plasmonic lasing under optical pumping. Silver-coated CsPbBr particles demonstrated stable plasmonic lasing in air. This one-pot synthesis method opens new possibilities for leveraging LHPs to implant microlaser sources into physical, biological, and industrial systems.