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

Lead halide perovskites (LHP) are solution-processable semiconductor materials with high optical gain and broad wavelength tunability, making them well-suited for laser applications. Here, a solution-based method for the 3D conformal coating of LHP microcrystals with noble metals is presented. A nanoscale metal coating layer is found to significantly enhance both laser performance and environmental stability. This enables gold-coated CsPbBr3 microcrystals to be delivered into live cells, achieving single-mode plasmonic lasing under optical pumping. Silver-coated CsPbBr3 particles demonstrate stable plasmonic lasing in the air. This one-pot synthesis method opens new possibilities for leveraging LHPs to implant micro-laser sources into physical, biological, and industrial systems.