超声驱动水油两相中绿色合成高稳定性CsPbBr3@MS-SiO2复合材料OA

Lead halide perovskite nanocrystals have garnered significant interest due to their exceptional optical properties.However,their poor environmental stability and the toxicity of conventional synthetic methods continue to impede practical applications.In this study,we report a novel ultrasound-assisted,green water/oil biphasic strategy for the in situ synthesis of CsPbBr3 nanocrystals encapsulated within mesoporous silica microspheres(CsPbBr3@MS).In this approach,ligand-free CsBr dissolved in water diffuses into the oil phase under ultrasonic agitation,where it reacts with oleic acid-coordinated Pb2+species preloaded in the silica mesopores,resulting in confined nucleation and encapsulation of CsPbBr3 NCs within the silica framework.Optical characterization and stability assessments demonstrate that mesoporous encapsulation substantially enhances both the photoluminescence properties and environmental stability of CsPbBr3@MS.Furthermore,tuning the aqueous CsBr concentration enables optimization of the optical output,yielding a maximum photoluminescence quantum yield(PLQY)of up to 60%.A dense SiO2 shell was subsequently formed on the composite surface via TEOS,facilitated by trace water within the mesopores.This secondary passivation layer further improved optical durability,retaining 80%of the initial emission intensity after 60 h of water immersion.Overall,this work presents a green and effective strategy for synthesizing environmentally stable,high-performance perovskite nanomaterials.