Thermoluminescence properties of novel KSrPO4: Tm phosphor

Abstract

A series of KSrPO₄ phosphor samples, doped with varying concentrations of Tm ³⁺, were meticulously synthesized using a high-temperature solid-state method. This paper presents, for the first time, a comprehensive analysis of the crystal structures, optical properties, and thermoluminescence characteristics of KSrPO₄: Tm phosphors. UV-Vis results revealed a clear decreasing trend in the reflection coefficient peaks as the Tm³⁺ doping concentration increases. Concurrently, the energy gap of the samples expended from the undoped 4.86 eV to 5.39 eV. The PL spectra are labelled with the electron jump states of Tm³⁺. The study of the thermoluminescence curves shows that the KSrPO₄: Tm sample has only one main thermoluminescence peak at 465 K. In this thesis, the conditions for optimal thermoluminescence intensity of KSrPO₄: Tm phosphors were investigated, and the results showed that the optimal doping concentration of Tm³⁺ was 0.2 mol%, the optimal annealing time was 0.5 h, and the optimal annealing temperature was 700 °C. We also found that the KSP(Tm0.2)¹ sample had 3.7 times than the commercially available α-Al₂O₃:C thermoluminescence intensity after irradiation with the same X-rays under the same experimental conditions. Kinetic analysis of the KSP(Tm0.2) has been carried out using glow curve deconvolution (GCD) functions to determine the trapping parameters, The kinetic analysis of KSP(Tm0.2) was carried out using the computerized glow curve deconvolution (CGCD) method and glow curve shape method to determine the capture parameters, including the order of kinetic (b), activation energy (E), and frequency factor (s). After 10 repetitions of the experiment, the TL performance of KSP(Tm0.2) was only attenuated by a rather low 1.72%. In addition, the effects of irradiation dose and heating rate on the TL curves were investigated.