Kinetic parameters of γ-irradiated Y2O3 phosphors: Effect of doping/codoping and heating rate

• In this paper, the effects of doping/codoping and heating rates are reported.
• Codoping with Eu3+ ions is more effective compared to Tb3+ ions for TL sensitivity.
• Modification/rearrangement of trap levels after codoping were observed.
• Increase in trap depth/frequency factor after codoping was observed.

This paper reports the thermoluminescence characteristics of Yb doped and Yb/RE3+ (RE=Eu, Tb) codoped Y2O3 phosphors under γ-irradiations. The phosphors were prepared by combustion synthesis method and characterized by X-ray diffraction (XRD) and Thermoluminescence (TL) techniques. XRD studies confirm the body-centered cubic structure of the phosphors. TL glow curves of doped and codoped phosphors exhibit single broad peak. Codoping with rare earth ions influences the glow peak temperature and intensity drastically. Intensity of the glow peak increases linearly in the studied γ-dose range. Kinetic parameters such as order of kinetics, trap depth and frequency factor associated with the glow peak were calculated by various glow curve methods.