Abstract
Luminescence from Bi and Bi/Er doped aluminum calcium germanate glasses were investigated. The glasses were prepared by conventional melting-quenching technique.The near infrared luminescence of Bi-doped calcium aluminum germinate glasses can be divided into two Gaussian peaks which are located at 1 265and 1 420nm separately.The X-ray photoelectron spectroscopy spectrum indicates the valence state of Bi ions in the calcium aluminum germinate glasses is the mixed.Bi 3+ions could be reduced to low valence states bismuth ions.The experiments support the assumption that the near-infrared luminescence is connected with a low valence state of Bi,may be Bi+.Er3+was introduced to adjust the 1420nm band of Bi-related fluorescence.With the increment of Er3+concentration,near-infrared fluorescence relative intensity of Bi ions is decreasing,which implies the energy transfer from Bi ions to Er3+.
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