Photo-induced structural and optical changes of CsPbBr3 perovskite nanocrystals in glasses

The interactive figure to visualize this research results. [Display omitted] •Revealing the passivation mechanism of excess Br on CsPbBr3 NCs in glasses.•Investigating the photo-induced structural and optical changes of CsPbBr3 NCs in glasses.•Demonstrating the fatal effect of photodamage on laser application of CsPbBr3 NCs.•Guiding the regulating photostability through Br concentration for application on light-emitting diodes and information storage. Cesium lead halide perovskite nanocrystals have particular optoelectronic properties and important applications in various fields. Embedding cesium lead halide perovskite nanocrystals into glass matrices have improved their thermal and chemical stabilities. However, these cesium lead halide perovskite nanocrystals in glasses are still sensitive to intense light irradiation, limiting their wide applications. In this work, fs laser irradiation on the structural and optical properties of cesium lead bromide (CsPbBr3) perovskite nanocrystals (PNCs) is investigated. It turns out that fs laser irradiation does not change the structural skeletons and band gap energies of CsPbBr3 PNCs in glasses, but induces surface Br vacancies. In-situ transient absorption spectral analysis reveals one