Thermoluminescence and photoluminescence of LiMgPO4 doped with Tb3+ phosphors fabricated by chemical co-precipitation method

LiMgPO₄ doped with different concentrations of Tb³⁺ are synthesized by using chemical co-precipitation method. Two complex thermoluminescence (TL) glow curves having intense TL peaks at 413 K and 420 K have been recorded for LiMgPO₄: 0.1 at.wt% of Tb³⁺ irradiated with 1 Gy and 5 Gy of $\gamma$-radiations respectively. The kinetic parameters such activation energy (E), order of kinetics (b) and frequency factor (s) of TL peaks have been evaluated using the CGCD method. The lifetimes of the TL glow peaks have been reported. The intense green photoluminescence (PL) emission is obtained at 545 nm due to ⁵D₄ → ⁷F₅ transition of Tb³⁺ under 230 nm excitation. The optimum green emission is found at 1 at.wt% Tb³⁺ doped sample.