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In recent years, all-inorganic lead-halide perovskites have received extensive attention due to their many advantages, but their poor stability and high toxicity are two major problems. In this paper, a low toxicity and stable Cs 2 SnCl 6 double perovskite crystals were prepared by aqueous phase precipitation method using SnCl 2 as precursor. By the XRD, ICP-AES, XPS, photoluminescence and absorption spectra, the fluorescence decay curve, the structure and photoluminescence characteristics of Ce 3+ -doped and undoped samples have been investigated in detail. The results show that the photoluminescence originates from defects. [ S n S n 4 + 2 + +V Cl ] defect complex in the crystal is formed by Sn 2+ substituting Sn 4+ . The number of defects formed by Sn 2+ in the crystal decreases with Ce 3+ content increases. Within a certain number of defects, the crystal luminescence is enhanced with the number of [ S n S n 4 + 2 + +V Cl ] decreased. When Ce 3+ is incorporated into the crystals, the defects of [ C e 3 + S n 4 + +V Cl ] and [ S n S n 4 + 2 + +V Cl ] were formed and the crystal show the strongest emission. This provides a route to enhance the photoluminescence of Cs 2 SnCl 6 double perovskite crystals.

Photoluminescence Characteristics of Sn2+ and Ce3+-Doped Cs2SnCl6 Double-Perovskite Crystals