Luminescence and scintillation characteristics of Mg²⁺-codoped (Lu_xGd_3-x)Al_2.4Ga_2.6O₁₂:Ce (x = 0.2–0.8) garnet crystals grown by the micro-pulling down method are investigated. The Ce³⁺ 5d₁ → 4f luminescence is blue-shifted with increasing Lu content due to the decrease in crystal field splitting of the 5 d levels. With increasing Lu content, the shortening of scintillation decay time accompanied with a decrease of LY value as measured at room temperature can be explained by thermal ionization of the Ce³⁺ 5d₁ excited state. Co-doping with Mg²⁺ results in the shortening of scintillation decay time, the reduction of LY value and afterglow intensity. At low temperature the radioluminescence quenching is observed in correlation with large thermoluminescence peaks, which can be attributed to the localization of electrons at intrinsic shallow traps.

研究了通过微下拉法生长的 Mg ²⁺共掺杂 (Lu _x Gd _3-x )Al _2.4 Ga _2.6 O ₁₂ :Ce (x = 0.2–0.8) 石榴石晶体的发光和闪烁特性。由于 5 d 能级的晶场分裂减少，Ce ³⁺ 5d ₁ → 4f 发光随着 Lu 含量的增加而发生蓝移。随着Lu含量的增加，闪烁衰减时间的缩短伴随着室温下LY值的降低可以通过Ce ³⁺ 5d ₁激发态的热电离来解释。与 Mg ²⁺共掺杂导致闪烁衰减时间缩短，LY值和余辉强度降低。在低温下，观察到与大热释光峰相关的辐射发光猝灭，这可归因于电子在本征浅陷阱处的定位。