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

CsPbBr3 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% CsPbBr3 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 CsPbBr3 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.