Synthesis and thermoluminescence studies of γ-irradiated Dy3+ doped SrGd2O4 phosphor

Dy3+ doped SrGd2O4 phosphors were synthesized via homogeneous precipitation cum auto-combustion method for the first time. Orthorhombic phase formation and granular morphology of SrGd2O4: Dy3+ samples were investigated through X-ray diffraction (XRD) and microscopic studies. Thermoluminescence (TL) characteristics of SrGd2O4: Dy3+,phosphors were taken after exposure of Co-60 gamma-rays. The TL glow curve of as-prepared phosphors was well-resolved into five peaks 114 degrees C, 161 degrees C, 198 degrees C, 248 degrees C, and 293 degrees C by using computerized glow curve deconvolution program. The effect of impurity (Dy3+) contents and heating rates for the TL glow curves were also studied. The linear behaviour of as-formed SrGd2O4: Dy3+ samples are observed within a wide range of dose of 80 Gy-2 kGy. Fading characteristics of SrGd2O4: Dy3+ phosphor was studied over the duration of 30 days. A comparative study was done to estimate different trapping parameters by employing Chen's peak shape method and CGCD simulation of TL glow curves. (C) 2017 Elsevier Ltd. All rights reserved.