Abstract
The spectroscopic properties (absorption, luminescence, EPR) of d 2-configurated cations (Fe(VI), Mn(V), Cr(IV)) doped into the tetrahedral sites of a great variety of oxidic solids are reviewed and supplemented by new results. Angular overlap model calculations on the basis of the bost site geometry, utilising a modified ligand field theory with different Racah parameters for e and t 2 orbitals, have been performed, which nicely fit the experimental data. In particular, they give evidence, that — in the case of Cr(IV)—the 1E state is usually positioned well above the luminescing triplet state, in agreement with the experiment. Further, the calculations allow a characterization of the transition-metal-oxygen bond. It is finally shown, that the doping cation does not necessarily adopt the host site geometry; geometric criteria are given.
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