CRYSTAL-FIELD ANALYSIS OF EU3+-DOPED YTTRIUM-ALUMINUM-GARNET BY SITE-SELECTIVE POLARIZED SPECTROSCOPY

The optical isotropy of cubic garnet was overcome by crystal-site-selective polarized excitation and fluorescence spectroscopy. By this method the energies and the symmetries of the crystal-field components of the free-ion states 7F(J) (J = 0, ..., 6), and 5D(J) (J = 0, ..., 3) could be determined. On this basis a crystal-field analysis was performed to derive the crystal-field parameters for the Eu3+ replacing the Y3+ ions on the D2 Sites. Most of the transitions were either of electric- or magnetic-dipole character. For a number of transitions mixed electric- and magnetic-dipole character was found, and the mixing ratios were determined.