Abstract: We studied the fluorescence spectrum changes after doping CsPbBr₃ with different amounts of Ga³⁺ by an improved one-pot hot-injection method, and photoluminescence quantum yield (PLQY) reached the highest when the molar ratio of Ga³⁺ and Pb²⁺ was 1∶1, which was 47% blue light. We successfully loaded Ga³⁺-doped perovskite quantum dots onto the cobalt borate crystal material, and found that the fluorescence intensity has no obvious quenching phenomenon for a long time, which enhances the stability of the perovskite quantum.