Regulating the morphology and luminescence properties of CsPbBr3 perovskite quantum dots through the rigidity of glass network structure

Embedding CsPbBr3 quantum dots (QDs) in inorganic glasses via in situ crystallization has been regarded as a feasible strategy to improve their stability due to the protecting role of the robust glass matrix. However, the influence of the rigidity of the glass network structure on CsPbBr3 crystallization is rarely reported. Herein, we report an approach to control the rigidity of the glass network structure through substituting the [GeO4] tetrahedron with the [SiO4] tetrahedron in mother glass, which allows fine-tuning of the morphology and luminescence properties of CsPbBr3 QDs. The water-resistance of CsPbBr3 QD glass (CsPbBr3 QD@glass) is clearly enhanced by increasing the content of the [SiO4] tetrahedron, while the size of CsPbBr3 nanocrystals decreases gradually and the corresponding quantum efficiency decreases. Moreover, the thermostability and photostability of CsPbBr3 QD@glasses were also studied systematically. The correlation between the rigidity of the glass network structure and the local microenvironment of the crystallization of CsPbBr3 QDs is revealed. Our results provide a reference for the design of mother glass to obtain perovskite QDs with high quantum efficiency and high stability based on the rigidity of the glass network.