Abstract
Fluoroaluminate glasses with the composition 36.5 AlF 3:13.5 YF 3:20 CaF 2:10 MgF 2:10 SrF 2:10 BaF 2 were doped with cerium and europium under various melting conditions. Depending on the melting conditions, different oxidation states of cerium and europium were obtained in the glasses. Using UV-visible absorption and fluorescence spectroscopy, these glasses were characterized. Cerium doped fluoroaluminate glasses had broad UV emission but exhibited apparent concentration quenching after concentrations of less than 1 mol% CeF 4. Europium doped glasses exhibited a broad UV/blue emission due to Eu 2+ and while concentration quenching was not observed with increased levels of EuF 3, the ratio of Eu 2+/Eu 3+ decreased with increasing total europium content. The apparent obeyance of the tarnishing model indicates that the Eu 2+/Eu 3+ ratio might be increased by increased exposure to H 2.
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