Abstract
Thermoluminescence emission spectra of rare earth dopants provide evidence on the site symmetry and interactions with many neighbouring atoms which show that there are changes associated with temperature, dopant concentration and other impurities, as well as the host lattice. Such factors require us to reassess the models of the defect sites and the mechanism of thermoluminescence. Results from recent spectral data lead to the conclusions that the trapping and recombination sites may not be independent; that the rare earth ions are always in the trivalent state; that energy transfer between sites is significant, and that the so called point defects sites are in fact complexes of many ions.
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