Thermoluminescence of 3d-ions doped CaF2

Thermoluminescence measurements of 80 K X-irradiated CaF2: Me (Me: Mn, Co, Ni) are reported. The spectral distributions of the glow peaks coincide with those of the X-ray excited luminescence. It has been previously attributed to Me2+ emission. The temperatures, activation energies and order of the kinetics for each peak are reported. They do not depend on the dopant and are the same as those given by other authors for the glow peaks in 80 K X-irradiated CaF2: RE. The observed emission is attributed to the de-excitation of Me2+ formed in an excited state by recombination of released holes with Me+ formed during low temperature X-irradiation. A similar mechanism has been proposed to explain the TL measurements in CaF2: RE.