All-inorganic cesium lead halide perovskite film has received extensive attention due to their excellent photoelectric properties. However,the poor stability of the perovskite film and the use of numerous expensive as well as toxic organic solvents during the preparation process severely hinder its commercial application process. In this work,aqueous solution is used as the solvent to prepare a perovskite precursor solution containing with sodium chloride(NaCl). The in-situ NaCl/ CsPbBr 3 cesium lead bromide perovskite composite film is obtained by a one-step solution method, and dimethyl sulfoxide(DMSO)solution is introduced to optimize the crystal structure and optical properties of the composite film. It is found that the synergistic effect of NaCl and DMSO can change the morphology of the crystal grains,improve the phase purity and enhance the fluorescence emis• sion of the composite film. The composite film exhibits the optimal green light emission with the 48. 2% photoluminescence quantum yield when the volume ratio of DMSO and the precursor solution reaches to 1∶2. In addition,benefiting from the effective combination of NaCl and the optimized crystal structure,the prepared composite film has the enhanced stability. The design is beneficial to the preparation of flexible,large-area and high-stability display fluorescence conversion films.
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