Effect of secondary heat treatment on the spectroscopic properties of Na2O-Nb2O5-P2O5 glasses |
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Authors: | T. V. Bocharova A. N. Vlasova G. O. Karapetyan A. M. Mironov |
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Affiliation: | (1) Department of Materials Process Technology, Institute for Microsystems Engineering, 79100 Freiburg, Germany;(2) Department of Powder Technology, Saarland University, 66123 Saarbrucken, Germany |
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Abstract: | We have studied the optical absorption and luminescence spectra of 45Na2O · xNb2O5 · (55 − x)P2O5 glasses containing 5, 10, 20, 25, 30, and 35 mol % Nb2O5. The results indicate that the absorption band around 26000 cm−1, responsible for the yellow color of the glasses, is due to the [Nb(5+)--O−] center and disappears upon secondary heat treatment. Heat treatment of europium-doped glasses increases the concentration of Eu3+ centers in an asymmetric environment, which is accompanied by an increase in luminescence efficiency. The reason for this is that the Eu3+ ions are located outside the niobate subsystem of the glass matrix. The europium in the glasses studied acts as a protector ion. |
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