Rapid Preparation of Gold Nanoparticle Substrates Inducing Perovskite Crystallization for Microlaser

Metal halide perovskites have emerged as exceptional optical-gain media, distinguished by high luminescence efficiencies, large absorption coefficients, and remarkable photoluminescence quantum yields, and have consequently found extensive application in micro- and nanoscale lasers. Regulating crystallization kinetics is key to improving the crystalline quality of perovskites, and the introduction of metal ions has been proven to be an effective strategy for controlling perovskite crystallization. Here, an Au nanoparticle (NP) film was rapidly prepared on a quartz substrate using a vacuum deposition-annealing method, and high-quality MAPbBr 3 crystallites with good morphology were synthesized on the substrate with an Au NP film by a one-step solution self-assembly method. Furthermore, the strong localized field and high energy density formed by the coupling resonance between emission from perovskite crystallites and localized surface plasmon of Au NPs significantly reduce the laser threshold. The MAPbBr 3 crystallites exhibit exceedingly good laser performance with a low laser threshold (2 μJ cm –2 ) and a high-quality ( Q ) factor (1033). This result offers a novel insight into the fabrication of high-performance perovskite micronanolasers.