Abstract

We report on the visible and near-infrared luminescence properties of Bi-doped sodium borosilicate glasses. The emission intensity at 420 nm due to the transition of Bi3+ decreases with increasing B2O3 concentration. Boron anomaly features were observed in both the visible emission at 618 nm due to the transition of Bi2+ and the near-infrared emission at 1340 nm due to the transition of Bi+. We have proposed a mechanism that suggests Bi+ to be responsible for the near-infrared luminescence, and [BO4] units play an important role for stabilizing Bi ions with low valence state in glasses.

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