A model is presented for predicting the emission spectra of trivalent lanthanide ions in sites of tetragonal symmetry in fluorite-structure crystal hosts. The utility of the model is examined by comparing the results of the calculations performed with the experimental data for the Eu<sup>3+</sup>:SrF<sub>2</sub> system. The a priori calculated energy-level scheme is found to reproduce the 14 experimentally observed crystal-field levels of the <sup>7</sup>F<sub>J</sub> multiplets of Eu<sup>3+</sup> with a rms deviation of 24.5 cm<sup>−1</sup>. Reasonably accurate model predictions of most emission-line intensities can also be obtained by including contributions from electrostatic shielding, wave-function expansion, and a modified energy separation between the 4ƒ configuration and the g symmetry perturbing states.
© 1988 Optical Society of America
K. Lesniak, "Calculation of the emission spectrum of Eu3+ in a tetragonal site in SrF2," J. Opt. Soc. Am. B 5, 1266-1272 (1988)