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The properties near infrared (NIR) - emitting centers were investigated in Bi-doped Mg.Al-silicate and phosphate
glasses. The NIR-emitting optical centers containing a pair of bismuth ions were shown to be formed in a reversible
redox chemical reaction. The common electric charge (+5) of bismuth ions in such centers was determined. The NIR-emission saturation measurements have made it possible to calculate the ground-state absorption cross-section
(~4.4×~10-19 cm2) of these centers at 532 nm and their absolute concentration in the glass. It was found that similar
emitting centers can also be formed in a colorless and non-luminescent Bi-doped glass by γ-irradiation. This fact
allowed deriving some conclusions on an optical center structure.
Boris I. Denker,Boris I. Galagan,Ilya L. Shulman,Sergey E. Sverchkov, andEvgeny M. Dianov
"Spectral and luminescent properties of Bi-doped bulk glasses and factors acting on them", Proc. SPIE 7598, Optical Components and Materials VII, 759805 (25 February 2010); https://doi.org/10.1117/12.840628
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Boris I. Denker, Boris I. Galagan, Ilya L. Shulman, Sergey E. Sverchkov, Evgeny M. Dianov, "Spectral and luminescent properties of Bi-doped bulk glasses and factors acting on them," Proc. SPIE 7598, Optical Components and Materials VII, 759805 (25 February 2010); https://doi.org/10.1117/12.840628