Luminescent Properties of Divalent Samarium-Doped Strontium Hexaborate
Chemistry of Materials1999Vol. 11(3), pp. 605–611
Citations Over TimeTop 14% of 1999 papers
Abstract
The valence change of samarium from trivalent to divalent in strontium hexaborate (SrB6O10) prepared in air is observed. The temperature dependence of the luminescence and vibronic transitions of Sm2+ are studied. The Sm2+ ions occupy three crystallographic sites. With increasing temperature, the 5D0→7F0 transition line exhibits red shifts, and the half-width increases. At room temperature, due to the thermal population through the 4f55d channel, the 5D1→7FJ transitions are observed even though the vibrational energy is very close to the energy gap between the 5D1 and 5D0 levels in the host. A coupled phonon energy of about 108 cm-1 is determined from the vibronic transitions of Sm2+ in the host.
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