High-temperature long persistent and photo-stimulated luminescence in Tb3+ doped gallate phosphor

SrGa2O4, possessing a one-dimensional chain structure of cations along a crystal direction, exhibits a self-activated blue long persistent luminescence (LPL) related to the intrinsic defects. Different trap depths are generated forming a successive defect structure in this three-dimensional framework of SrGa2O4 containing channels occupied by Sr2+ when Tb3+ ions are introduced. The deeper traps are critically important to prevent the thermal fading of carriers at room temperature, therefore, LPL is achieved in SrGa2O4:Tb3+ phosphor at 328 K. Furthermore, a photo-stimulated luminescence originated from Tb3+ ions is realized in SrGa2O4:Tb3+ phosphor induced by 980 nm laser diode with the assistance of the deeper traps at room temperature.257