We report on long-lasting afterglow phosphorescence at around 500 nm in Ce3+-doped yttrium scandium gallium garnet (YSGG) ceramics with the composition of (Y0.995Ce0.005)3Sc2Ga3O12 prepared by solid-state reaction at 1600 °C. The afterglow luminescence was observed for 1 h after the 440 nm excitation in the Ce:YSGG ceramic prepared under vacuum. However, the afterglow decay time decreased after O2 annealing. Therefore, one of the potential traps can be oxygen vacancies. Based on the correlation between the 5d levels and the conduction band, we present an afterglow mechanism and propose a new persistent phosphor under white light emitting diode (LED) illumination.
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