Abstract
The reduction process from trivalent to divalent state for Sm 3+ and Yb 3+ ions in barium borates (BaB 8O 13) prepared in air was observed. The luminescence properties of these divalent rare-earth ions were studied. Yb 2+ shows an f-d broad emission band, due to the 4f 14 → 4f 135d transition, while the Sm 2+ ion shows an f → f transition. From the spectra of Yb 2+, and using the 5D 0 → 7F 0 transition of Sm 2+ as a structural probe, two crystallographic sites were found to be available for the cations in the host. Vibronic transitions of Sm 2+ were observed at low temperature. BaB 8O 13 was found to be a good host for reducing the trivalent rare-earth ions to divalent state and to exhibit interesting spectroscopic properties.
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