Determination of Thermoluminescence Kinetic Parameters of La2O3 Doped with Dy3+ and Eu3+

Abstract

Thermoluminescence (TL) properties of La2O3: Dy3+, Li+, and La2O3: Eu3+, Li+, exposed to 5.12 Gy of beta radiation, and recorded at different heating rates 0.5, 1, 2, 3, 4, and 5 °C s−1 (from Molefe et al., paper 2019), were analyzed and the trap parameters were determined in this study. These parameters include the order of kinetics b, the activation energy E (eV), the frequency factor S (s−1), or the pre-exponential factor S’’ (s−1), and the initial concentration of trapped electrons no (cm−3). A new non-linear curve fitting technique, based on the general order kinetic equation and the outcomes of Hoogenstraaten’s Method, was established and applied on the TL glow peaks of La2O3: Dy3+, Li+. The fitting technique was evaluated by calculating the R-square and figure of merit (FOM) values. The results revealed that the FOM values are <1%, and the R-square values are >0.997, which demonstrates an excellent convergence between experimental and fitted curves. A modified technique based on the three-points analysis method was exploited to deconvolute complex TL glow curves of La2O3: Eu3+, Li+, and in turn to determine the trap parameters the method disclosed that each TL glow curve consists of four peaks. The trap parameters of the individual peaks were numerically determined. The fading, as a function of storage temperature and time, from the TL signals of the investigated materials was predicted and discussed based on the calculated trap parameters. The results support the value of the materials for employment in radiation dosimeter applications with a low fading fraction.

Full-color, time-valve controllable and Janus-type long-persistent luminescence from all-inorganic halide perovskites

“…The shallow trap depths of CsCdCl 3 :0.8%Br and CsCdCl 3 :10%Br were estimated to be 0.53 eV and 0.73 eV (Supplementary Figs. 19e, 20e ), respectively, based on the Hoogenstraaten method 57 , providing further evidence that the free storage and release of charge carriers from the traps is an important factor in ensuring ultralong-lived emission. Furthermore, the 3D TL spectra are used to analyze color-changing afterglow based on the relationship between the emission and TL spectrum.…”

Biocompatibility and radiosensitivity of a fiber optical-based dosimeter: biological applications

“…The kinetic parameters such as activation energy or the depth of trap, E(eV) , position of peak temperature, T M (K), frequency factor, S(s -1 ) , and b is the kinetic order of TL which play an important role in TL dosimetry, since these parameters are crucial for material properties and defects. It is worth noting the importance of the kinetic parameters when considering trapping phenomena, escape probability, and recombination of electrons through the trap and recombination centers before light emission [ 27 ]. The kinetic parameters of the TL glow curves are determined via a Computerized Glow Curve Deconvolution (CGCD) method to evaluate the kinetic parameters of the TL materials [ 27 – 30 ], such as activation energy, order of kinetics, the CGCD method can be applied [ 31 ].…”

“…It is worth noting the importance of the kinetic parameters when considering trapping phenomena, escape probability, and recombination of electrons through the trap and recombination centers before light emission [ 27 ]. The kinetic parameters of the TL glow curves are determined via a Computerized Glow Curve Deconvolution (CGCD) method to evaluate the kinetic parameters of the TL materials [ 27 – 30 ], such as activation energy, order of kinetics, the CGCD method can be applied [ 31 ]. The current study matches our previous research [ 14 ] concerning the TL properties of the FOD.…”

The Potential Use of Car Windscreens for Post-Accident Dose Reconstruction in the Periphery of Nuclear Installations

“…In comparison, low storage temperatures indicate a greater response relative to ambient temperature. In addition, the research to date [32] has published a numerical method in predicting the fading of the TL signal as a function of the trapping parameters for the first, second and general order kinetics. As the values of the order of kinetics increases under the identical values of activation energy E (eV) and pre-exponential factor S" (s −1 ), the fading is predicted to delay due to a high possibility of the electrons re-trapping phenomenon.…”