Preparation and TSL studies in Tb activated LiMgPO _4 phosphor

摘要

LiMgPO _4:Tb ~(3+) phosphor was synthesized by solid state reaction. The thermally stimulated luminescence (TSL) glow curve of Tb doped LiMgPO _4 exhibits a main TSL peak at 170°C with shoulders at 100 and 260°C on either side of this peak. The TSL sensitivity of the phosphor was found to be about 2.5 times that of CaSO _4:Dy phosphor. TSL emission and photoluminescence (PL) studies show that Tb ~(3+) ion acts as luminescence centre in this phosphor. The kinetic parameters, namely activation energy (E) and frequency factor (s) associated with the main glow peak have been determined using peak shape method. The activation energy and frequency factor obtained are 1.35 ± 0.03 eV and (6.53 ± 0.43) × 10 ~(14) s ~(-1) respectively. The paper discusses the dosimetric characteristics like dose response, fading, energy response and minimum detectable dose and results thereof.