The Effect of Be Co-Doping on Luminescence Properties of Gd3Al3Ga2O12:Ce Glass Ceramics

The glass-ceramics (GC) of gadolinium aluminum gallium garnets with the expected composition of Gd3Al3Ga2O12:Ce and Gd3Al3Ga2O12:Ce,Be (GAGG:Ce and GAGG:Ce,Be, respectively) are fabricated by crystallization from the Gd2O3-Al2O3-Ga2O3-CeO2-SiO2-BeO (Gd:Ga:Al ratio is close to 3:2:3) glasses. The influence of Be2+ co-doping (including doping level) on the luminescent properties of the GAGG is demonstrated. In particular, Be co-doping results in the suppression of the Ce3+-related radioluminescence (RL) and as a consequence, the light yield is lowered as well. The conclusion is made that Be2+ creates effective electron or hole trapping centers.