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Luminescence Studies of Pr3+ Doped Chitosan Biocomposite Matrix through UV Radiation Induced Thermal Stimulation

Abstract Thermoluminescence of Pr3+ doped chitosan biocomposite matrix (CBM) has been investigated. The polycrystalline sample of the matrix was prepared by the conventional solid-state reaction method. The formation of calcium sulfide in this process is checked for crystallization and phase by X-ray diffraction study, and the sample is found to have a rock salt structure at room temperature. Thermally stimulated luminescence studies of the matrix sample irradiated by a UV source show one prominent glow peak around 492.7 K and a shoulder peak around 370 K when heated with a linear heating rate of 2°C/s. The two glow peaks were isolated via thermal cleaning and a detailed kinetic analysis has been performed by various methods of determining the trap parameters, namely, order of kinetics (b), activation energy (E), and frequency factor (s) associated with both peaks of the CBM:Pr3+ matrix. A critical survey of the methods of determining E in our sample is undertaken to extend the domain of application as far as possible. We comment on the comparison between the derived parameter values and the correct values. From these comparisons we attempt to obtain some useful insights to assist in the interpretation of experimentally observed thermoluminescence spectra.