Photoluminescence Characteristics of Sn(2+) and Ce(3+)-Doped Cs(2)SnCl(6) Double-Perovskite Crystals

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. [[Formula: see text] +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 [[Formula: see text] +V(Cl)] decreased. When Ce(3+) is incorporated into the crystals, the defects of [[Formula: see text] +V(Cl)] and [[Formula: see text] +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.