Luminescence, stability, and applications of CsPbBr3 quantum dot/polymethyl methacrylate composites prepared by a solvent- and ligand-free ball milling method

CsPbBr 3 perovskite quantum dots/polymethyl methacrylate composites were prepared by a ball milling method, using PMMA as polymer matrix and cesium stearate, lead stearate, and KBr as perovskite sources. We investigated the stability of the composites against UV light , heat, ethanol, and water vapor and evaluated the luminescence performance of the products. The results show that the 1.5% CsPbBr 3 PQDs/PMMA composite prepared by the present method exhibited excellent performance, with a PLQY up to ∼78% and a high stability. The luminous intensity remained at 80%, 87%, 53%, 59%, and 64% of its initial value under ultraviolet light irradiation for 12 days, 467.5 nm LED irradiation for 10 days, heating at 60 °C for 10 days, erosion in water vapor at 95% relative humidity and 25 °C for 90 h, and soaking in ethanol for 3 h, respectively. The luminous efficiency of a white light-emitting diode fabricated with the CsPbBr 3 PQDs/PMMA composite was 76.73 lm·W −1 , and the RhB degradation percentage under visible light reached 92.2% within 60 min. The preparation method has the advantages of simple processing, solvent- and ligand-free nature, low synthesis temperature, and easy scalability; the as-prepared PQDs composites have high quantum yields and good environmental stability, which highlights the great application prospects of the present method.