TSL and EPR studies of SrBPO5 doped with CeO2and co-doped with CeO2 and Sm2O3

Abstract

Thermally stimulated luminescence (TSL) and electron paramagnetic resonance (EPR) investigations were carried out on gamma irradiated SrBPO5 samples doped with CeO2 and co-doped with CeO2 and Sm2O3. On gamma-irradiation at room temperature, BO32-, O2- and O- radicals were produced. It was seen that the O- radical ion disappeared in the sample annealed at 500 K. It is proposed that the recombination between trapped electrons and O- radical ions results in transfer of recombination energy to the impurity centre Ce3+ resulting in TSL glow peak at 485 K. In the case of co-doped samples energy transfer occurs between Ce3+ to Sm3+ resulting in increase in the intensity of glow peak at 485 K.