MOF-triggered formation of MAPbBr3@PbBr(OH) with enhanced stability

Abstract

Poor stability has long been a critical issue for lead halide perovskites that impeded their practical applications. To address this issue, we propose a novel and facile strategy to synthesize a highly stable fluorescent methylammonium lead bromide perovskite (MAPbBr₃)@PbBr(OH) composite through introducing a metal–organic framework (MOF) viz. a metal azolate framework (MAF-6) into the perovskite precursor solution during the ligand-assisted reprecipitation process. Different from the embedment of PNCs in MOFs, this strategy is achieved based on the hydrolysis reaction of PbBr₂ triggered by a MOF combined with the confining synthesis of perovskite crystals inside the MOF cavity. The obtained MAPbBr₃@PbBr(OH) composite exhibits high PLQY (∼45%) and enhanced stability against heat, UV light and especially various polar solvents. It is believed that the prepared MAPbBr₃@PbBr(OH) with excellent solvent stability implies great potential as a green-emitting phosphor for luminescence application in a harsh environment, especially in a solvent system.