Enhanced luminescent properties and optical absorption of γ-irradiated KI: Ce3+, Tb3+ crystals

These results supported that an effective energy transfer occurs from Tb3+ to Ce3+ in the KI host. Co-doping Ce3+ ions greatly intensified the excitation peak at 260 nm for the emission at 393 nm of Tb3+, which means that more lattice defects, involved in the energy absorption and transfer to Tb3+, are formed by the Ce3+ co-doping. The integrated light intensity is an order of magnitude higher as compared to the undoped samples for similar doses of irradiation and heating rates. The defects generated by irradiation were monitored by optical absorption and TSL Trap parameters for the TL process are calculated and presented.