Du Yiping, Ma Lin, Yan Zhengguang, Xiao Jiawen, Wang Kaiwen, Lin Taifeng, Han Xiaodong, Xia Dingguo
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.
Inorg Chem. 2023 Jul 24;62(29):11350-11359. doi: 10.1021/acs.inorgchem.3c00770. Epub 2023 Jul 13.
Low-dimensional hybrid copper(I) halides attract considerable attention in the field of light emissions. In this work, we obtained the centimeter-sized single crystal of 1,3-propanediamine copper(I) iodide (PDACuI) with a solvent evaporation method. The single crystal X-ray diffraction of PDACuI reveals that the [CuI] tetrahedra form the corner-connected chains separated by PDAs, forming a one-dimensional structure with an orthorhombic space group of . The band gap is determined to be 4.03 eV, and the room temperature photoluminescence (PL) quantum yield is determined to be 26.5%. The thermal quenching and negative thermal quenching of emission are observed via temperature-dependent PL spectra, and our study shows that the intermediate nonradiative state below the self-trapped exciton state may get involved in these temperature-dependent behaviors. The X-ray scintillation performance of PDACuI single crystals is also evaluated, and the relative light output renewed to 94.3% of the fresh one after a low-temperature annealing. On the basis of our results, PDACuI single crystals provide nontoxicity and renewable scintillation performance, thus showing potential application in the area of low-cost radiation detectors.
低维混合卤化亚铜（I）在发光领域引起了相当大的关注。在这项工作中，我们采用溶剂蒸发法获得了厘米尺寸的1,3 - 丙二胺碘化亚铜（PDACuI）单晶。PDACuI的单晶X射线衍射表明，[CuI]四面体形成由丙二胺隔开的角连接链，形成一维结构，其正交空间群为 。其带隙确定为4.03 eV，室温光致发光（PL）量子产率确定为26.5%。通过温度相关的PL光谱观察到发射的热猝灭和负热猝灭，我们的研究表明，自陷激子态以下的中间非辐射态可能参与了这些与温度相关的行为。还评估了PDACuI单晶的X射线闪烁性能，低温退火后相对光输出恢复到新鲜样品的94.3%。基于我们的结果，PDACuI单晶具有无毒和可再生的闪烁性能，因此在低成本辐射探测器领域显示出潜在的应用前景。
