CsI:Tl膜状闪烁屏因其高荧光量子效率、高空间分辨率、荧光发射波长与可见光探测器光敏波段匹配最佳等性能优势，在X射线无损检测和显示闪烁屏领域具有巨大的应用价值，而物相微结构调控和余辉抑制是目前该闪烁屏面向成像应用亟需解决的关键问题，本项目创新性地提出一种闪烁屏物相微结构调控方法和余辉抑制机理。利用衬底半湿润方法诱导晶体薄膜微晶柱晶粒的生长及结晶择优取向，以实现闪烁屏的物相微结构调控；选择合适的空间群晶体结构，以增大斯托克斯位移、降低晶体结构维度，改善CsI晶体本征发光；探明Tl离子掺杂方式及掺杂浓度对CsI晶体发光中心和缺陷中心分布和数量的影响规律，揭示CsI:Tl晶体的荧光和余辉发光机理；优选共掺杂稀土离子和浓度，以抑制CsI:Tl膜状闪烁屏余辉发光，系统分析共掺杂条件下陷阱能级深度及载流子浓度的变化规律，探明晶体余辉抑制机理，为新型显示闪烁屏开发提供理论与技术支撑。

CsI:Tl scintillation films have huge application value in the field of X-ray nondestructive detection and scintillation screen, because of the performance advantage of high fluorescence quantum efficiency, high spatial resolutionbest, and matching between the fluorescence emission wavelength and sensitive band of visible detector. The phase microstructure regulation and afterglow suppression are the critical issues that need to solve for the imaging application. This project has innovatively presented a new regulative method of phase microstructure and the afterglow suppression mechanism for CsI:Tl scintillation films. The substrate subwetting method will be used to induce the growth and preferred orientation of microcrystalline column grains, so as to realize the microstructure regulation of films. The appropriate spatial group crystal structure will be selected to increase stokes shift and reduce the crystal structure dimension, which could improve the intrinsic luminescence of CsI crystal. The influence of Tl doping mode and concentration on the distribution and number of luminescence centers and defect centers of CsI crystal will be investigated to reveal the luminescence mechanism of fluorescence and afterglow of CsI:Tl crystal. The appropriate rare earth ions and co-doping concentration will be optimized to suppress the afterglow of CsI:Tl scintillation films and the variation regularity of trap level depth and carrier concentration of CsI:Tl crystal under rare earth ion co-doping will be systematically analyzed to reveal the afterglow suppression mechanism, which could provide theoretical and technical support for the development of new scintillation screens.