Zhao Chunli, Gao Yuan, Qiu Jianbei
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China.
Inorg Chem. 2023 Oct 23;62(42):17382-17389. doi: 10.1021/acs.inorgchem.3c02684. Epub 2023 Oct 10.
Two-dimensional (2D) layered double perovskites have attracted much attention because of their excellent photoelectric properties. However, few reports have been published on the synthesis of 2D layered double perovskites from halide perovskites as precursors. Here, we report that CsCdCl and CsBiCl were synthesized by the coprecipitation method, and a two-dimensional layered double perovskite CsCdBiCl was readily synthesized by mixing the two halide perovskites. We doped different amounts of Mn into CsCdCl to form CsCdMnCl, which introduced impurity states into the energy level and exhibited an orange-red light emission that is characteristic of Mn. A series of 2D layered double perovskites CsCdMnBiCl were synthesized from CsCdMnCl and CsBiCl, which showed a bright orange-yellow luminescence under ultraviolet excitation. The presence of high concentrations of Cd in the two-dimensional layered double perovskites weakened the strong Mn-Mn coupling and suppressed the energy transfer to defects, thus minimizing nonradiative decay and promoting efficient energy transfer. Our work provides a new concept for the synthesis of low-dimensional metal halide perovskites with unique optical properties.
二维（2D）层状双钙钛矿因其优异的光电性能而备受关注。然而，关于以卤化物钙钛矿为前驱体合成二维层状双钙钛矿的报道却很少。在此，我们报道通过共沉淀法合成了CsCdCl和CsBiCl，并通过将这两种卤化物钙钛矿混合，轻松合成了二维层状双钙钛矿CsCdBiCl。我们向CsCdCl中掺杂了不同量的Mn以形成CsCdMnCl，其在能级中引入了杂质态，并表现出Mn特有的橙红色发光。由CsCdMnCl和CsBiCl合成了一系列二维层状双钙钛矿CsCdMnBiCl，它们在紫外激发下呈现出明亮的橙黄色发光。二维层状双钙钛矿中高浓度Cd的存在减弱了强Mn-Mn耦合，并抑制了向缺陷的能量转移，从而使非辐射衰减最小化并促进了高效的能量转移。我们的工作为合成具有独特光学性质的低维金属卤化物钙钛矿提供了一个新的概念。
