Effect of W and Mo co-doping on the photo- and thermally stimulated luminescence and defects creation processes in Gd3(Ga,Al)5O12:Ce crystals

Photo- and thermally stimulated luminescence characteristics of Gd3(Ga,Al)5O12:Ce single crystals co-doped with W Mo are investigated in the 85–510 K temperature range compared corresponding undoped Ce3+ - doped Gd3(Ga,Al)5O12 similar composition. A strong effect impurity ions appears photoluminescence spectra dependences intensity, afterglow intensity decay kinetics, (TSL) TSL glow curves, excitation curve peaks activation energy their creation. The obtained results explained by enhancement intrinsic emission contribution into spectrum Gd3(Ga,Al)5O12:Ce,W Gd3(Ga,Al)5O12:Ce, due to a large concentration various related electron traps these and, consequently, O− type hole centers, as well crystal lattice defects (e.g., cation vacancies needed for excess positive charge compensation W6+ Mo6+ ions). influence co-doping on scintillation is discussed.