Yang Liangwei, Li Zhenyu, He Linwei, Sun Jiayu, Wang Junren, Wang Yumin, Li Ming, Zhu Zibin, Dai Xing, Hu Shu-Xian, Zhai Fuwan, Yang Qian, Tao Ye, Chai Zhifang, Wang Shuao, Wang Yaxing
Department of Physics, Fudan University, 200433, Shanghai, China.
School of Science, Westlake University, 310024, Hangzhou, China.
Angew Chem Int Ed Engl. 2023 Aug 14;62(33):e202306465. doi: 10.1002/anie.202306465. Epub 2023 Jun 22.
The development of high-performance X-ray detectors requires scintillators with fast decay time, high light yield, stability, and X-ray absorption capacity, which are difficult to achieve in a single material. Here, we present the first example of a lanthanide chalcogenide of LaCsSiS : 1 % Ce that simultaneously integrates multiple desirable properties for an ideal scintillator. LaCsSiS : 1 % Ce demonstrates a remarkably low detection limit of 43.13 nGy s and a high photoluminescence quantum yield of 98.24 %, resulting in a high light yield of 50480±1441 photons/MeV. Notably, LaCsSiS : 1 % Ce exhibits a fast decay time of only 29.35±0.16 ns, making it one of the fastest scintillators among all lanthanide-based inorganic scintillators. Furthermore, this material shows robust radiation and moisture resistance, endowing it with suitability for chemical processing under solution conditions. To demonstrate the X-ray imaging capacity of LaCsSiS : 1 % Ce , we fabricated a flexible X-ray detector that achieved a high spatial resolution of 8.2 lp mm . This work highlights the potential of lanthanide chalcogenide as a promising candidate for high-performance scintillators.
高性能X射线探测器的发展需要具有快速衰减时间、高光产额、稳定性和X射线吸收能力的闪烁体，而这些特性很难在单一材料中实现。在此，我们展示了首例掺1%铈的镧铯硅硫（LaCsSiS : 1 % Ce）镧系硫族化物，它同时集成了理想闪烁体的多种理想特性。LaCsSiS : 1 % Ce表现出极低的探测限，为43.13 nGy s，光致发光量子产率高达98.24%，从而实现了50480±1441 光子/兆电子伏的高光产额。值得注意的是，LaCsSiS : 1 % Ce的快速衰减时间仅为29.35±0.16 纳秒，使其成为所有镧系无机闪烁体中衰减速度最快的闪烁体之一。此外，这种材料具有很强的抗辐射和防潮性能，使其适合在溶液条件下进行化学加工。为了展示LaCsSiS : 1 % Ce的X射线成像能力，我们制作了一种柔性X射线探测器，其空间分辨率高达8.2 线对/毫米。这项工作突出了镧系硫族化物作为高性能闪烁体的潜在前景。
