Luminescence spectra and energy transfer of Tm<sup>3+</sup> and Tb<sup>3+</sup> doped in LiMgPO<sub>4</sub> phosphors

<sec> LiMgPO<sub>4</sub> (LMP) phosphor doped with rare earth is a promising radiation dosimeter material. Thermoluminescence (TL) spectroscopy an effective method to study the carrier traps and luminescence centers in materials. To luminescent mechanism of rare-earth-doped LMP phosphors, phosphors Tm Tb (LMP:Tm, LMP:Tb LMP:Tm, Tb) are prepared by high temperature solid state reaction. The TL glow curve spectrum measured linear heating method, compared photoluminescence (PL) spectrum. </sec><sec> shape varies doping active impurities, but curves can be fitted seven peaks. Double-doping Tm<sup>3+</sup> Tb<sup>3+</sup> enhance intensity fifth peak (<i>E</i> ~ 1.39 eV) weaken seventh 1.70 eV). By comparing PL spectra it seen that more complex than excited ultraviolet light (λ = 352 nm). In process, electrons which conduction band release energy recombination centers, released effectively excite ions from ground states, resulting emitting peaks process. Although when simultaneously, likely act as sensitizers LMP:Tm phosphor, transfer low-energy ions, makes high-energy then de-excited light. This result also proved fact decay increases concentration increasing. through non-radiative transition significant at higher temperature. </sec>