Abstract
Laser selective excitation and fluorescence has been performed on LiYF 4 and KY 3F 10 doped with samarium ions. In LiYF 4, a single, tetragonal symmetry center associated with isovalent substitution of Sm 3+ with lattice yttrium ions is present. By contrast, three Sm 2+ centres and a single, tetragonal symmetry Sm 3+ center are detected in KY 3F 10. This complex defect distribution is tentatively explained by the existence of charge-compensating F − vacancies.
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