脉冲中子、伽马的混合辐射场测量迫切需求高灵敏度闪烁体探测器。近年来金属卤素钙钛矿具有高荧光效率、较短的荧光寿命、很好的抗辐照性能，因而成为了辐射探测领域极具潜力的新型闪烁体材料。

本课题以高发光效率的全无机零维钙钛矿铯铜碘和兼具高发光效率、快时间响应的二维有机无机杂化钙钛矿为研究对象，开展了基于人工微结构的高灵敏闪烁探测技术和相关闪烁材料的辐射性能研究，大幅改善或提升这些新型闪烁体材料的光输出性能。

主要完成了以下工作：

(1) 开展了钙钛矿Cs₃Cu₂I₅闪烁材料表面的光子晶体的制备研究。通过对光提取特性的数值模拟，获得了最优参数（微球直径），根据参数使用微球自组装和干法转移方法完成了光子晶体的制备，从而实现了Cs₃Cu₂I₅闪烁体1.4~2.0倍的光提取效率的提升；

(2)开展了二维有机无机杂化钙钛矿的发光特性研究，获得了其发光线性、发光光谱、发光衰减时间等辐射性能，证明该类材料具有高发光效率、快的时间响应，可用于中子伽马联合诊断。此外在准二维钙钛矿PEA-FAPbBr表面制备了光子晶体，获得了2.5倍光提取效率的提升；

(3)研制了基于CsI(Na)与Cs₃Cu₂I₅微晶的高效蓝光复合闪烁体，并对其闪烁发光性能开展了研究。利用CsI(Na)的发射区与Cs₃Cu₂I₅的吸收区存在近乎完美的重叠的特性，通过CsI(Na)辐射作用下发出的紫外光（峰位在310nm）对Cs₃Cu₂I₅进行二次激发，成功实现了紫外光到蓝光的移波，最终获得了产额达57500光子/MeV的高效蓝光闪烁体。使用该复合闪烁体获得了高质量、高分辨的X射线成像，证明了该材料可以满足高效、环保、低成本的X射线探测应用需求。

新型钙钛矿材料的研发和应用，结合光子晶体光提取优化技术，为辐射探测技术难题的突破提供新的可能，对发展先进闪烁器技术具有重要的学术价值和实践意义。

High sensitivity scintillation detector is urgently needed for the measurement of pulsed neutron and gamma radiation mixed field. In recent years, metal halogen perovskite has become a potential new scintillation material in the field of radiation detection due to its high fluorescence efficiency, short fluorescence lifetime and good radiation resistance performance.

In this paper, all inorganic zero-dimensional perovskite with high luminescence efficiency cesium copper iodine and two-dimensional organic inorganic hybrid perovskite with high luminescence efficiency and fast time response are taken as the research objects. The highly sensitive scintillation detection technology based on artificial microstructure and the radiation properties of related scintillation materials are studied to greatly improve or enhance the light output performance of these new scintillation materials.

This paper mainly completed the following work:

1.The preparation of photonic crystal on the surface of perovskite Cs₃Cu₂I₅ scintillation material was studied. Through the numerical simulation of the optical extraction characteristics, the optimal parameters (microsphere diameter) were obtained. According to the parameters, the microsphere self-assembly and dry transfer method were used to prepare the photonic crystal, and thus the optical extraction efficiency of Cs₃Cu₂I₅ scintillator was improved by 1.4~2.0 times.

2.The luminescence properties of two-dimensional organic and inorganic hybrid perovskite were studied, and the luminescence linearity, luminescence spectrum, luminescence decay time and other radiation properties were obtained. It is proved that this kind of material has high luminescence efficiency and fast time response, and can be used for the combined diagnosis of neutron and gamma. In addition, photonic crystals were prepared on the surface of quasi-two-dimensional perovskite PEA-FAPbBr, and the optical extraction efficiency was improved by 2.5 times.

3. An efficient blue composite scintillator based on CsI(Na) and Cs3Cu2I5 was developed and its scintillation and luminescence properties were studied. Based on the nearly perfect overlap between the emission region of CsI(Na) and the absorption region of Cs3Cu2I5, the second excitation of Cs3Cu2I5 is carried out by ultraviolet light (peak at 310nm) emitted under the action of CsI(Na) radiation, and the shift wave from ultraviolet light to blue light is successfully realized. An efficient blue scintillator with a yield of 57,500 photons /MeV was obtained. The composite scintillator was used to obtain high quality and high resolution X-ray imaging, proving that the material can meet the requirements of efficient, environmentally friendly and low-cost X-ray detection applications.

The development and application of new perovskite materials, combined with photonic crystal light extraction optimization technology, provides new possibilities for the breakthrough of radiation detection technology, and has important academic value and practical significance for the development of advanced scintillator technology.