Role of Ga3+ in SrTiO3 : Pr,Ga phosphor studied through its aging behavior under low-dose electron irradiation

Abstract

We have studied the role of Ga3+ ions in rTiO(3):Pr,Ga phosphor throuth its aging behavior. At the early stage of electron irradiation with a charge dose rate of 100 muC/cm(2) per second, the cathodoluminescence (CL) intensity of SrTiO3:Pr,Ga phosphor drops. On the other hand, it is found that SrTiO3:Pr,Ga phosphor shows different aging characteristics from SrTiO3:Pr as the electron irradiation proceeds, However, from a reduced beam cur-rent density irradiation with a charge dose rate of 1.2 muC/cm(2) per second, it is determined that the Ga3+ ion acts as a hole-keeping center and increases the luminescence by providing a hole to the activator Pr3+ ion in the luminescence process.