Abstract
Thermoluminescence from alkaline-earth halides with rare-earth ionsshows emission signals from both the host and the dopants. In manycases each glow peak contains a complete set of emission lines fromthe rare-earth dopant, but in the case of Er in SrF2 thespectra change significantly with temperature. In part this isinterpreted as evidence for a range of erbium sites, and in part asevidence for energy transfer between erbium states. Near200 °C the conversion between the 545 and 525 nm emissionlines follows a thermally activated pattern consistent with thedifferences in their initial energy states. This pair oftransitions define more glow peaks than signals from the other Erlines. Spectrally analysed recording of the thermoluminescence isthus essential to separate the closely spaced glow peaks.
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