The role of ligand coordination on the spectral features of Yb3+ ions in lead aluminum silicate glasses |
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| Authors: | M Sundara Rao Ch Srinivasa Rao BV Raghavaiah G Sahaya Baskaran V Ravikumar IV Kityk N Veeraiah |
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| Institution: | 1. Department of Physics, Acharya Nagarjuna University, Nuzvid Campus, Nuzvid 521 201, AP, India;2. Department of Physics, Andhra Loyola College, Vijayawada 520 008, AP, India;3. Department of Physics, University College of Engineering and Technology, Acharya Nagarjuna University, Nagarjuna Nagar 522 510, AP, India;4. Electrical Engineering Department, Technical University of Czestochowa, Aleja Armii, Krajowej 17/19, PL-42-201 Czestochowa, Poland |
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| Abstract: | The glasses of the composition (40 ? x)PbO–(5 + x)Al2O3–54SiO2:1.0Yb2O3 (in mol%) with x ranging from 5 to 10 have been synthesized. The IR spectral studies of these glasses have indicated that there is a gradual transformation of Al3+ ions from tetrahedral to octahedral coordination with increase of Al2O3 content in the glass network. The optical absorption and luminescence spectra have exhibited bands originating from 2F7/2 → 2F5/2 and 2F5/2 → 2F7/2 transitions, respectively. From these spectra, the absorption and emission cross-sections and fluorescence lifetime of Yb3+ ions have been evaluated. Quantitative analysis of these data indicated a decreasing radiative trapping and increasing fluorescence lifetime of Yb3+ ions with increasing Al2O3 content. This may be explained by structural variations in the vicinity of Yb3+ ions due to variation in the concentration of Al2O3 in the glass network. |
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