TL–OSL correlation studies of LiMgPO4:Tb,B dosimetric phosphor

The recently synthesized LiMgPO4:Tb,B (LMP) is a highly sensitive Optically Stimulated Luminescence (OSL) phosphor for dosimetric applications. Studies were carried out to assess the correlation between thermoluminescence (TL) and OSL of this phosphor. Measurements like Residual TL (R-TL), Continuous Wave OSL (CW-OSL) and Linearly Modulated OSL (LM-OSL) of LMP were carried out and various curves thus obtained were de-convolved using Computerized Curve Deconvolution (CCD) program. The deconvolution of CW-OSL and LM-OSL curves showed five different first order components in LMP. It was observed that OSL signal of LMP has its origin from five traps having different photo-ionization cross-sections. Same traps were found to be responsible for both TL and OSL in this phosphor. Bleaching decay rates were calculated for each R-TL glow peaks and compared with the decay rates of individual OSL components. The value of decay rates of R-TL and OSL matches well. Experimental verification of presence of individual OSL components using tbleach–tmax method was carried out.

► The recently synthesized LiMgPO4:Tb,B is a high sensitive Optically Stimulated Luminescence (OSL) phosphor.
► Correlation between TL and OSL of this phosphor is reported.
► CW-OSL and LM-OSL deconvolution techniques and tbleach–tmax method.
► OSL signal of LMP arises from the five optically sensitive traps of different photo-ionization cross-section.
► The bleaching of each individual TL glow-peak takes place in three different rates and is correlated to OSL components.