Comparative study of optical and scintillation properties of Tm~(3+):YAG, and Tm~(3+):LuAG single crystals

摘要

The optical and scintillation properties of Tm~(3+)-doped yttrium aluminum garnet Y_3A1_5O_(12) (YAG) and Tm~(3+)-doped lutetium aluminum garnet Lu_3Al_5O_(12) (LuAG) are compared. The Tm~(3+)-doped single crystals were grown by the micro-pulling down (μ-PD) technique. Both crystals demonstrated some emission peaks originated from 4f-4f forbidden transition of Tm~(3+) under ~(241)Am alpha-ray excitation. The scintillation decay time of Tm~(3+)-doped YAG was similar to that of LuAG. When irradiated by the gamma-rays from a ~(137)Cs source, the relative scintillation light yields of Tm:YAG was 90% greater than that of Tm:LuAG.