Synergistic effect induces self crystallization of CsPbBr3 quantum dots in borosilicate glass matrix by LiF

Abstract

Cesium lead halide perovskite (CsPbX₃) quantum dots (QDs) are recognized as viable substitutes for conventional fluorescent powder color converters, which can improve the color gamut and reproducibility of liquid crystal displays (LCDs). Encapsulating QDs in glass can effectively solve the water oxygen stability of QDs, but the glass matrix impedes the nucleation of QDs and the precipitation of QDs requires secondary heating. In our research, we successfully accomplished the self-crystallization of CsPbBr₃ QDs facilitated by LiF within a B₂O₃-SiO₂-ZnO borosilicate glass matrix. The results indicate that the self crystallization of CsPbBr₃ QDs induced by LiF in borosilicate glass matrix has a synergistic effect. The Li ⁺ ions can break the glass network structure and facilitate ionic migration and transport, while F⁻ ions have good electronegativity due to ion aggregation, and can strongly attract Cs⁺ and Pb²⁺ ions with larger atomic radii, thereby promoting the rapid nucleation and growth of CsPbBr₃ QDs, ultimately synthesizing QDs with uniform particle size, narrow half peak width, good optical properties, and thermal stability.