Single crystals of yttrium phosphate doped with Eu3+ were investigated by means of polarized emission and absorption spectroscopy. The spectra are consistent with the known D2d site symmetry of the Eu3+ ion, and most of the observed transitions have been assigned. The energy-level structure of the 7F multiplet and the lower part of the 5D multiplet has been defined, and the former has been described in terms of a crystal-field model. The optical parameters for such a model have been calculated, and comparisons are made with similar calculations on yttrium vanadate.
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Brecher et al. (1968) studied this question.
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