Effect on In3+ co-doping on photoluminescence and scintillation properties of LYSO:Ce crystal

Abstract

In this work, a series of LYSO:0.03 at.% Ce,xat.%In (x = 0, 0.001, 0.005 and 0.01) crystals were successfully grown for the first time by the optical floating zone (FZ) method. The effect of In³⁺ co-doping on photoluminescence and scintillation properties of LYSO:Ce scintillation single crystal was investigated. It was found that at x = 0.001, the overall scintillation performance was optimized. This was attributed to the fact that In³⁺ co-doping reduces the concentration of Ce2 emission center and accelerates the photoluminescence decay time of Ce³⁺. The temperature dependence of photoluminescence of LYSO:Ce,xat.%In samples was also investigated. Combined with density functional theory calculation, the phenomenon of In³⁺ co-doping leading to a decrease in quenching temperature of decay time was explained in terms of both crossover relaxation and introduction of impurity energy levels.