Abstract
The luminescence of Sm 2+ in BaB 8O 13 are studied as a function of temperature. At 10 K, several crystallographic sites for Sm 2+ ions with inversion symmetry are possible and 5D 0→ 7F 1 transition show predominant intensities, whereas above 50 K two crystallographic sites without inversion symmetry are clearly observed for Sm 2+ in BaB 8O 13 and the 5D 0→ 7F 0 transition show strongest intensity. The vibronic transitions and the non-radiative transitions of Sm 2+ are studied and a coupled-phonon energy about 50 cm −1 is obtained. The thermal effects on the line shift, emission intensities, half-width and lifetime of the 5D 0→ 7F 0 transition are also studied. The decay curves at different temperatures are all in single exponential and are temperature-independent with lifetime around 3.5 ms.
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