新型ZnO:Ga单晶纳米棒阵列X射线闪烁转换屏研究

超快、高空间分辨率的高能X射线或粒子探测与成像的关键在于获得兼备超快衰减时间、结构化闪烁转换屏。紧扣国防科技、高能物理、核物理等领域的国家战略需求，结合ZnO基材料所具备的亚纳秒衰减时间、高光产额等突出优势，我们率先提出以ZnO:Ga单晶纳米棒阵列为对象，开展新型结构化高能X射线闪烁转换屏的设计、制备及性能等相关基础研究，为实现高能X射线（>10 keV）的超快、高空间分辨率探测与成像奠定基础。研究中，在纳米阵列结构的蒙特卡罗模拟设计与材料微结构的第一性原理计算等理论指导下，建立ZnO:Ga纳米棒闪烁阵列的生长方法，获得制备高闪烁性能ZnO:Ga阵列的优化条件。通过探索纳米棒阵列结构、材料微结构与闪烁性能之间的内在关系，揭示它们对能量传递过程和闪烁性能影响的作用机理，研制出能基本满足高能X射线探测与成像要求的大尺寸、亚纳秒衰减时间、亚微米空间分辨率闪烁转换屏。

The critical issue on the development of X-ray and high-energy particle detection and imaging with superfast and high-spatial resolution is to achieve the structural scintillation detector arrays with superfast decay time. Combination of the excellent advantages of ZnO-based material, such as the sub-nanosecond decay time and high light yield, the corresponding fundamental researches on the design, fabrication and performance of novel ZnO:Ga high-energy X-ray scintillation screen with single crystal nanorod array structure are proposed firstly in order to satisfy the requements of the defence-related science and technology, high energy physics and nuclear physics. There research works will be favorable for laying a solid foundation for high-energy X-ray (>10 keV) detection and imaging with superfast and high-spatial resolution. Under the theoretical guidances of Monte Carlo simulation design of the nanrod arrays and the first-principles computation of the material microstructures, the method of the growth of nanorod scintillation arrays will be established, and the optimal processing conditions for the fabrication of the ZnO:Ga nanorod arrays with excellent scintillation performances will be obtained in this porject. The mechanism of the influences of the array structures and material microstructures on the energy transfer process and scintallation performances will be revealed by exploring the intrinsic relationship between the scintillation properties and these structures. The scintillation screen with large size, sub-nanosecond decay time and sub-micrometer spatial resolution will be developed through our efforts, so as to basically satisfy the requements of high-energy X-ray detection and imaging.