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We report an experimental investigation of the emission spectra of a 1000molppm sol–gel Ge-doped silica by fine tuning the excitation energy in the ultraviolet (UV) range, around 5eV, and in the vacuum-UV range, around 7.3eV, at room temperature and at 10K. The sample is characterized by a blue (centered at ∼3.2eV) and an UV (centered at ∼4.3eV) bands. We have found that the ratio between the area...
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