role of ligand coordination on the spectral features of Yb³⁺ ions in lead aluminum silicate glasses

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 Al...

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Published in:Journal of molecular structure 2012, Vol.1007 (11), p.185-190
Main Authors: Sundara Rao, M, Srinivasa Rao, Ch, Raghavaiah, B.V, Sahaya Baskaran, G, Ravikumar, V, Kityk, I.V, Veeraiah, N
Format: Article
Language:English
Subjects:
absorption
aluminum
fluorescence
glass
ions
lead
quantitative analysis
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Summary: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.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2011.10.044