Abstract
Li3PO4:Dy3+ materials with varying concentrations of Dy3+ ranging 0.05–0.5 mol% were prepared using solid state diffusion method. The formation of the material in single orthorhombic phase having space group Pnma (62) was confirmed by X-ray diffraction (XRD) technique. For studying thermoluminescence (TL) dosimetry characteristics under high-temperature environments, the material was irradiated with UV-C radiation (∼254 nm) doses from 1.0 to 120.0 mJ/cm2 and X-ray doses ranging from 10.0 to 150.0 Gy under different high-temperature environments (50–330 °C). Optimisation conditions for the maximum TL intensity were found to be Dy3+ impurity concentration 0.2 mol% and pre-annealing at 300 °C. The TL glow curves mainly consist of two peaks appearing at around 230 and 340 °C for UV-C and X-rays but consists of three peaks in case of γ-rays at around 165, 328 and 354 °C. In spite of the variation in sensitivities, the dose responses of the high temperature peak (at around 340 °C) under different irradiation temperature environments remain almost linear/sublinear till saturation. Low fading, linear dose response under different high-temperature environments, stable glow curve structure with isolated dosimetry peak (at around 340 °C) makes the material a good candidate for the dosimetry of low to high-energy radiations under high-temperature environments.
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•Li3PO4:Dy3+ TLD phosphor material prepared by solid state diffusion method.•Isolated and very stable TL glow peak at around 340 °C.•Irradiation under high-temperature environment at different temperatures from RT to 330 °C.•Dosimetry of UV-C and X-rays in high-temperature environments.•High-sensitivity, low fading and high-temperature glow peak makes the Li3PO4:Dy3+ a good TLD phosphor for high-temperature dosimetry.