A2InCl5·H2O:Sb3+(A=Cs, Rb, K)的荧光特性

1)深圳大学物理与光电工程学院,广东深圳 518060; 2)深圳大学微纳光电子学研究院,广东深圳 518060

固体发光; 自陷激子; 自陷激子发光; 无铅钙钛矿; 阳离子调控; A2InCl5·H2O(A=Cs, Rb, K); 光致发光调控; 电声耦合作用; 姜-泰勒畸变; 0维钙钛矿

Fluorescence properties of A2InCl5·H2O:Sb3+(A=Cs, Rb, K)
LIU Zexiang1, 2, ZHOU Bo2, FANG Shaofan2, and SHI Yumeng2

1)College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China;2)Institute of Microscale Optoelectronic, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China

solid state luminescence; self-trapped exciton; the photoluminescence of self-trapped excitons; lead-free perovskites; regulation of cation; A2InCl5·H2O(A=Cs, Rb, K); photoluminescence tuning; electro-acoustic coupling; Jahn-Teller distortion; 0-dimensional perovskites

DOI: 10.3724/SP.J.1249.2021.03239

备注

自陷激子发光是金属卤化物钙钛矿荧光材料中一种常见的发光行为,晶格的变形能力对其自陷态发光有显著影响.以Sb3+掺杂的0维无机钙钛矿A2InCl5·H2O(A=Cs, Rb, K)为研究对象,利用X射线衍射、荧光光谱以及拉曼光谱等手段对其表征分析,研究阳离子半径变化导致的[InCl5H2O]2-/[SbCl5H2O]2-八面体变形对荧光特性的影响.研究结果表明,当阳离子半径减小时,材料的晶面间距变小,带隙增大,激发光谱发生蓝移.同时,材料的电声耦合作用增强,非辐射复合过程增强,斯托克斯位移增大,谱线增宽,光谱发生红移,光致发光量子产率降低.研究结果对钙钛矿自陷态发光的调控提供了有效途径.
The photoluminescence of self-trapped excitons is a common luminescence behavior of metal halide perovskite fluorescent materials. The ability of Lattice deformation has a significant impact on its self-trapped exciton luminescence. The 0-dimensional inorganic perovskite A2InCl5·H2O(A=Cs, Rb, K)doped with Sb3+ is characterized by X-ray diffraction, fluorescence spectroscopy and Raman spectroscopy. The effect of octahedral deformation of [InCl5H2O]2-/[SbCl5H2O]2- due to cation radius change on the fluorescence properties is investigated. The decrease of the cation radius causes the decrease of the interplanar spacing of material, the increase of band gapand the blue shift of the excitation spectrum. At the same time, the electro-acoustic coupling effect of material is enhanced, then the non-radiative recombination process is enhanced, the Stokes shift increases, the spectral line broadens, the spectrum red shift happens, and the photoluminescence quantum yield decreases. This paper provides an effective way to regulate the self-trapped excitons luminescence of perovskites.
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