216−type metal halide perovskites (A2BX6) have garnered significant attention in recent years due to their environmental friendliness and excellent optoelectronic properties. However, large bandgaps, high production costs, and suboptimal photoluminescence (PL) limit the further applications in optoelectronics. To overcome these limitations, cation synergistic substitution at both the A−site and B−site has emerged as an effective strategy to tune and optimize their optical properties. In this study, Bi3+−doped Cs2SnCl6 and (BTP)2SnCl6 (BTP+=C25H22P+) were successfully synthesized via a cost−effective and high−yield solution crystallization method under varying temperature conditions. Structural and optical characterizations reveal that both Cs2SnCl6: xBi3+ and (BTP)2SnCl6: xBi3+ exhibit bright blue self−trapped excitons (STE) emission. Their luminescence properties can be effectively tuned by tuning Bi3+ doping concentrations, with excellent STE emission achieved at 5%. Notably, distinct differences in luminescence features, including Stokes shift, full width at half maximum (FWHM), PL decay time, and chromaticity coordinates, are observed in Cs2SnCl6: xBi3+ and (BTP)2SnCl6: xBi3+. These differences originate from the lattice isolation effects induced by the different sizes and functionalities of A−site cations, further influencing the dynamic behaviors of exited−state carrier. Based on these findings, a temperature−responsive dual−color fluorescent anti−counterfeiting seal was designed, demonstrating the practical application potential of these materials. Our strategy on cation synergistic substitution provides a theoretical and experimental guidance to develop novel tin−based perovskites.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |