Cheng Shuangliang, Beitlerova Alena, Kucerkova Romana, Mihokova Eva, Nikl Martin, Zhou Zhengyang, Ren Guohao, Wu Yuntao
Shanghai Institute of Ceramics, Chinese Academy of Sciences, 585 He-shuo Road, Shanghai 201899, P. R. China.
University of Shanghai for Science and Technology, 516 Jun-gong Road, Shanghai 200093, P. R. China.
ACS Appl Mater Interfaces. 2021 Mar 17;13(10):12198-12202. doi: 10.1021/acsami.0c22505. Epub 2021 Mar 3.
A novel all-inorganic CsCuI single-crystalline perovskite as a nonhygroscopic and efficient X-ray and γ-ray scintillator is described herein. It is featured by a one-dimensional (1D) perovskite structure with an orthorhombic system and a space group of . The CsCuI crystal emits yellow light peaking at 570 nm originated from strongly localized 1D exciton emission. It appears self-absorption free because of the large Stokes shift of 1.54 eV. The photophysics process of the self-trapped exciton was studied using temperature dependent photoluminescene spectra and decay kinetics measurements. The CsCuI crystal exhibits an extremely low afterglow level of 0.008% at 10 ms under X-ray excitation. Under Cs γ-ray irradiation, its light yield is 16 000 photons/MeV with an energy resolution of 7.8% at 662 keV.
本文介绍了一种新型的全无机CsCuI单晶钙钛矿，它是一种不吸湿的高效X射线和γ射线闪烁体。其特征在于具有正交晶系和空间群的一维（1D）钙钛矿结构。CsCuI晶体发出峰值位于570 nm的黄光，源于强局域化的1D激子发射。由于1.54 eV的大斯托克斯位移，它似乎没有自吸收。利用温度依赖的光致发光光谱和衰减动力学测量研究了自陷激子的光物理过程。CsCuI晶体在X射线激发下10 ms时的余辉水平极低，为0.008%。在Cs γ射线照射下，其光产额为16000光子/MeV，在662 keV时的能量分辨率为7.8%。
