Thermoluminescence and defect centers in Europium doped Yttrium oxide nanophosphor

Abstract

In this work ,we have employed for the analysis of TL glow curves of Eu3+ : Y2O3 material. The continuous promotion in numerical methods has greatly helped to solve the complex TL kinetic equations (rate equations) which can not be solved analytically. The complexity of the rate equations increase with the number of traps considered. In this thesis,the properties of the thermoluminescence glow curves of Eu3+ : Y2O3 has been employed theoretically in view of first order kinetics. As activation energy increases the glow curve shifts to higher temperatures with a decrease in the height. For higher E values or deeper traps more energy or higher temperature is needed to release the charge carriers. Therefore, Similar changes can be noticed as the parameter s is varied but now in the opposite way: As frequency factor s increases the peak shifts to lower temperatures with an increase of the height and a decrease in width. A trapping center with a high frequency factor needs less energy or it needs lower temperature to free a charge carrier