Kinetic Parameters Analysis of GdAlO3 Based on Thermoluminescent Phenomenon

Herein, it is reported on calculating thermoluminescence (TL) kinetic parameters determined from the TL emission of synthetic GdAlO3 (GAO) phosphors prepared by the coprecipitation method. The sample characterized employing X-ray diffraction with an orthorhombic phase structure (space group Pnma (62)) shows complex glow curves consisting of at least four groups of components peaked at 100, 140, 240, and 290 degrees C where the two lower overlapped temperature peaks are difficult to identify using the TM-Tstop. The coexistence of a continuum in the trap distribution (linked to the lower temperature peaks) and a discrete trap system (associated with the components at temperatures higher than 200 degrees C) can be distinguished. The estimation of the TL kinetic parameters is performed using GlowFit, computing glow curve deconvolution (CGCD), and various heating rate methods. However, only CGCD appears as the suitable technique for such purpose since it provides information on the TL physical process supported by mathematical models based on a linear combination of functions related to the first order kinetic approach.