Fig. 1. Flow chart of synthesis of CsPbBr₃@ZnO/PMMA QDs and preparation of polymer luminescent film

Fig. 2. Structural characterization of CsPbBr₃ QDs. (a) Ideal model of CsPbBr₃@ZnO QDs; (b) XRD patterns of CsPbBr₃ QDs and CsPbBr₃@ZnO; (c)(d) EDS element mapping images and corresponding SEM images of CsPbBr₃@ZnO/PMMA films; (e)(f) TEM and HRTEM images of CsPbBr₃@ZnO/PMMA films

Fig. 3. XPS spectra of CsPbBr₃@ZnO and CsPbBr₃ QDs. (a) Zn 2p; (b) Cs 3d; (c) Pb 4f; (d) O 1s; (e) total energy spectrum of XPS; (f) FTIR of CsPbBr₃ and CsPbBr₃@ZnO QDs

Fig. 4. Effect of zinc diethyl volume on optical properties of CsPbBr₃@ZnO/PMMA. (a) Photoluminescence emission spectrum of CsPbBr₃@ZnO/PMMA dots with different zinc diethyl volume; (b) ultraviolet-visible absorption spectrum of CsPbBr₃@ZnO/PMMA with different diethylzinc volume; (c) time-resolved fluorescence spectrum of CsPbBr₃@ZnO/PMMA dots with different diethylzinc volume

Fig. 5. Effect of diethylzinc on water stability of CsPbBr₃ QDs. (a) CsPbBr₃/PMMA_{(1) and CsPbBr3@ZnO/PMMA (2) QDs films under normal illumination before immersion in water and under 395 nm ultraviolet irradiation; (b) luminescence of CsPbBr3/PMMA (1) and CsPbBr3@ZnO/PMMA (2) QDs films after immersion in water under normal light and 395 nm ultraviolet lamp; (c)(d) PL spectral changes of CsPbBr3/PMMA QDs and CsPbBr3@ZnO/PMMA QDs films after continuous immersion in water for 6 d}

Fig. 6. Effect of zinc diethyl on thermal stability of CsPbBr₃ QDs. (a) Luminescence of CsPbBr₃/PMMA (1) and CsPbBr₃@ZnO/PMMA (2) QDs films under normal light and 395 nm ultraviolet lamp before heating test; (b) luminescence of CsPbBr₃/PMMA (1) and CsPbBr₃@ZnO/PMMA (2) QDs films under normal illumination after heating test and under 395 nm ultraviolet irradiation; (c) (d) PL spectral changes of CsPbBr₃/PMMA QDs and CsPbBr₃@ZnO/PMMA QDs films tested by heating for 40 min

Fig. 7. CsPbBr₃@ZnO/PMMA green film, KSF red film, and blue LED integrated white device diagram. (a) PL spectrum of WLED (inset is white light physical picture); (b) CIE chromaticity coordinates and gamut range of WLED