Processes involved in the high-temperature thermoluminescence of a Mn2+-doped MgF2 phosphor

The thermoluminescence (TL) glow curve recorded after gamma‐irradiation at room temperature of Mn2+‐doped MgF2 phosphor shows two intense TL peaks at 364 K and 420 K accompanied by several weaker peaks up to 600 K. The TL spectra have shown Mn2+ luminescence at about 560 nm. The 364 K TL peak disappears after one day of storage, and so is probably related to the recombination of carriers from some shallow traps. Based on thermal bleaching and optical bleaching (in the 260 nm F‐centre absorption band) experiments, the 420 K TL peak was ascribed to the thermally activated recombination between an F‐centre and a hole centre trapped in the neighbourhood of the Mn2+ impurity which results in Mn2+ luminescence. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)