Meng Xianfu, Wei Qilin, Lin Wenchao, Huang Tao, Ge Shuaigang, Yu Zongmian, Zou Bingsuo
Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials and Key Lab of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education; School of Resources, Environments and Materials, Guangxi University, Nanning 530004, China.
School of Physics, Guangxi University, Nanning 530004, China.
Inorg Chem. 2022 May 9;61(18):7143-7152. doi: 10.1021/acs.inorgchem.2c00667. Epub 2022 Apr 29.
Metal halide perovskites have flexible crystal and electronic structures and adjustable emission characteristics, which have very broad applications in the optoelectronic field. Among them, all-inorganic perovskites have attracted more attention than others in recent years because of their characteristics of large diffusion length, high luminescence efficiency, and good stability. In this work, Sb-doped RbCdCl crystalline powder was synthesized by a simple hydrothermal method, and its luminescence properties were studied, which showed a broad emission band with a large Stokes shift and efficient yellow light emission at about 596 nm at room temperature with a photoluminescence quantum yield of 91.7%. The emission came from the transition of the self-trapped exciton 1 (STE1) out of P ( = 0, 1, and 2) to S due to strong electron-phonon coupling, which scaled with increasing temperature. Moreover, its emission color became white at low temperatures due to the occurrence of transition of other self-trapped exciton 0 (STE0) state emission out of the S states of Sb ions to S in the lattice. These emission color changes may be used for temperature sensing, and this Sb-doped RbCdCl material expands the knowledge of the efficient luminescent inorganic material family for further applications of all-inorganic perovskites.
金属卤化物钙钛矿具有灵活的晶体和电子结构以及可调节的发射特性，在光电子领域有着非常广泛的应用。其中，全无机钙钛矿近年来因其扩散长度大、发光效率高和稳定性好等特点而比其他材料更受关注。在这项工作中，通过简单的水热法合成了Sb掺杂的RbCdCl晶体粉末，并对其发光性能进行了研究，结果表明其在室温下呈现出具有大斯托克斯位移的宽发射带，并在约596 nm处有高效的黄光发射，光致发光量子产率为91.7%。该发射源于自陷激子1（STE1）从P（=0、1和2）到S的跃迁，这是由于强电子 - 声子耦合导致的，且随温度升高而变化。此外，由于其他自陷激子0（STE0）态发射从Sb离子的S态跃迁到晶格中的S态，其在低温下发射颜色变为白色。这些发射颜色变化可用于温度传感，并且这种Sb掺杂的RbCdCl材料扩展了高效发光无机材料家族的知识，以促进全无机钙钛矿的进一步应用。
