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

Abstract

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.