In this paper we reported the preparation technique and thermoluminescence (TL) properties of rare earth (RE) doped lithium calcium borate (LCB) and lithium magnesium borate (LMB) phosphors. The phosphors were prepared by solid state diffusion reaction method. The TL glow curves were recorded for all the RE doped phosphors. In LCB phosphor thulium (Tm) doped LCB shows the good TL glow curve with high temperature glow peak at 430 ºC compared with other dopants. In the case of LMB phosphors terbium (Tb) doped phosphor gives the good TL sensitive glow peak at 250 ºC. The thermoluminescence emission spectra were recorded for RE doped LCB and LMB phosphors to know the luminescence emission centres. In LCB and LMB phosphors, TL emission spectra showed the emission of their dopants transition. The emission centres of TL glow curves were confirmed by TL emission spectra
