Du Yiping, Yan Zhengguang, Xiao Jiawen, Zhang Guoqing, Ma Yang, Li Songyu, Li Yonghong, Zhou Quan, Ma Lin, Han Xiaodong
Institute of Microstructure and Property of Advanced Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China.
J Phys Chem Lett. 2022 Jun 23;13(24):5451-5460. doi: 10.1021/acs.jpclett.2c01045. Epub 2022 Jun 9.
Low-dimensional hybrid halide perovskite materials with self-trapped exciton (STE) emissions and anisotropic properties are highly attractive for their great potential in many applications. However, to date, reports on large one-dimensional (1D) perovskite single crystals have been limited. Here, centimeter-sized 1D single crystals of trimethylammonium lead iodide (TMAPbI) with typical STE emission are synthesized by an antisolvent vapor-assisted crystallization method. Thermal quenching and antiquenching with a high relative sensitivity of photoluminescence (PL) are observed and studied via temperature-dependent photoluminescence spectroscopy. Further analysis indicates that the temperature-dependent PL behaviors are influenced by the self-trapping of the free exciton and the migrations between self-trapped excitons and intermediate nonradiative states. The TMAPbI single crystal also exhibits a linearly polarized emission and a large birefringence that is higher than those of commercial birefringent crystals. This 1D perovskite with high structural anisotropy has promise for applications in versatile optical- and luminescence-related fields.
具有自陷激子（STE）发射和各向异性特性的低维混合卤化物钙钛矿材料因其在许多应用中的巨大潜力而极具吸引力。然而，迄今为止，关于大型一维（1D）钙钛矿单晶的报道仍然有限。在此，通过反溶剂气相辅助结晶法合成了具有典型STE发射的厘米级碘化三甲基铵铅（TMAPbI）一维单晶。通过变温光致发光光谱观察并研究了热猝灭和具有高光致发光（PL）相对灵敏度的反猝灭现象。进一步分析表明，变温PL行为受自由激子的自陷以及自陷激子与中间非辐射态之间的迁移影响。TMAPbI单晶还表现出线性偏振发射和比商用双折射晶体更高的大双折射。这种具有高结构各向异性的一维钙钛矿在多种光学和发光相关领域具有应用前景。
