闪烁体余辉的形成机理和抑制研究是闪烁探测领域非常重要的一个研究工作，很多性能优良的闪烁体的发展都受制于其具有较强的余辉。掺铕稀土倍半氧化物RE2O3:Eu(RE=Lu, Y, Sc)是其中一类非常有代表性的闪烁体，该体系中有丰富的载流子陷阱，余辉强度也与中心对称格位的铕离子Eu(S6)电偶极跃迁发光比例成正比。本项目拟以RE2O3:Eu单晶为研究载体，以材料的载流子陷阱和局域结构为主要研究对象，以XRD、余辉测试仪、热释光谱仪等分析技术为手段，结合第一性原理计算，厘清材料中载流子陷阱状态，揭示RE2O3:Eu的余辉形成机理；阐明能量传递效率、局域结构等影响因素与Eu(S6)发光比例的内在联系。借助组合方法，通过优化制备条件和组分，消除或减少晶体的载流子陷阱，降低Eu(S6)发光比例，实现余辉的抑制。本项目的开展将有助于推动掺铕稀土倍半氧化物材料的发展，丰富闪烁体的余辉形成机理和抑制理论。

Study on afterglow mechanism and suppression has been an important work in the field of scintillation detection. Many scintillators with outstanding performance are hampered by the afterglow problem. Europium doped rare earth oxide RE2O3:Eu is one typical this kind scintillator with abundant carrier traps. Its afterglow intensity is also proportional to the luminescence ratio of the Eu3+ dipole transition located at the S6 centrosymmetric site. Combined with first principle calculation, this project intends to take the RE2O3:Eu single crystal as research carrier, take the carrier trap and local structure as research target, take the XRD, afterglow tester, thermoluminescence and other analytical techniques as research tools, in order to make clear the trap state in RE2O3 host and the afterglow formation mechanism, illustrating the inner relationship between energy transfer, local structure and Eu(S6) luminescence ratio. With the support of combinational method, through optimizing the component and preparation procedure, the afterglow can be suppressed by decrease of trap and Eu(S6) luminescence. This project is helpful in promotion of the development of europium doped RE2O3 materials, enriching the design theory of rare earth sesquioxide optical functional materials.