Sintering aids may enter the host lattice, create defects, and seriously deteriorate the scintillation properties of ceramic scintillators. In this study, the 0.3at%Pr:LuAG ceramics with different excess of Lu were fabricated by the solid-state reactive sintering without aids. The influences of stoichiometry on the sintering behaviors, optical and scintillation properties of the ceramics are systematically studied. The results show that the stoichiometric ceramics experience an abnormal grain growth during sintering. The Lu excess can restrain the abnormal grain growth of the ceramics because of the impurity drag effect. The excess Al₂O₃ as optical scattering centers, can also pin in the grain boundary to limit the fast migration of the grain boundaries. The light yield value of the as-sintered ceramics decreases with the increase of Lu content. After air-annealing, the ceramics with appropriate excess of Lu can achieve better optical quality and higher light yield compared to the stoichiometric Pr:LuAG ceramics.

烧结助剂可能会进入基质晶格，产生缺陷，并严重恶化陶瓷闪烁体的闪烁性能。在这项研究中，通过不使用助剂的固态反应烧结制备了Lu含量不同的0.3at％Pr：LuAG陶瓷。系统研究了化学计量对陶瓷的烧结行为，光学和闪烁性能的影响。结果表明，化学计量陶瓷在烧结过程中会出现异常的晶粒长大。由于杂质的拖曳作用，过量的Lu可以抑制陶瓷的异常晶粒生长。多余的Al ₂ O ₃作为光学散射中心，也可以钉扎在晶界中以限制晶界的快速迁移。随着Lu含量的增加，烧结后的陶瓷的光产率值降低。经过空气退火后，与化学计量的Pr：LuAG陶瓷相比，Lu含量适当过量的陶瓷可以获得更好的光学质量和更高的光输出。