Abstract
Single crystal samples of Ce3+-doped fluorides CaNaYF6 and BaMgF4 have been grown in a reducing atmosphere, with the intent of studying the effects of symmetry and ligand coordination on the dopant energy levels. The optical absorption spectra of Ce3+ in these crystals consist, at most, of five overlapping bands. The luminescence is also a broad band due to strong electron—phonon interaction in the 5d excited state. The energies of the lowest absorption band and the luminescence band are shifted to low energy compared to those in LiCaAlF6 and LiYF4. This trend may be explained by lowering symmetry of the anion-coordinate polyhedra of Ce3+ in these crystals.
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