Abstract
Blue and green luminescence spectra of Tb3+ ions in lead phosphate glasses were examined under UV excitation. The green-to-blue luminescence intensity ratio G/B is considerably reduced with decreasing Tb3+ concentration. Thus, blue emission lines are enhanced in comparison to the main 5D4-7F5 green transition of Tb3+. These effects strongly depend on terbium-terbium interactions in lead phosphate glasses. It was confirmed by luminescence decay curve analysis and calculations using the Inokuti-Hirayama model.
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