Temperature dependence of photo- and radio-luminescence and scintillation properties of Lu2YAl2.5Ga2.5O12:Ce,Mg multicomponent garnet crystals

Luminescence and scintillation properties of Lu2YAl2.5Ga2.5O12:Ce,Mg (0.02, 0.05 %) garnet crystals grown by the micro-pulling down method were investigated. The onset temperature for luminescence quenching at -365 K is determined from the temperature dependence of photoluminescence decay time. At room temperature, the Mg (0.05 %) sample exhibits high integral scintillation efficiency of -445 % of BGO crystal, light yield value of 23,500 photons/MeV, and fast scintillation decay times of 20 ns (15 %) + 54 ns (85 %). The higher radioluminescence intensity of the Mg (0.05 %) sample correlates with an appearance of its lower themally-stimulated luminescence intensity in 77-500 K range.