29 August 2002 Structural evolution and fluorescence properties of Dy3+: silica matrix
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Proceedings Volume 4905, Materials and Devices for Optical and Wireless Communications; (2002) https://doi.org/10.1117/12.481057
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China
The Dy3+ doped silica glasses were prepared by sol-gel process with appropriate heat treatment. The structural changes during the gel to glass transition of the silica xerogels and the effect on fluorescence properties of Dy3+ were studied. For Dy3+ two dominant emissions occur at about 575nm(4F9/26H15/2) in the yellow region and 480nm (4F9/26H13/2) in the blue region. Both transitions are electric dipole in nature out of which (4F9/26H13/2) is hypersensitive. The intensity ratio (yellow to blue (Y/B)) of Dy3+ emission follows a trend parallel to the red to orange (R/O) ratio of Eu3+ in silica matrices. These ratios are influenced by the site symmetry and electro negativity of ligand atoms. The fluorescence intensity of Dy3+ ions increases remarkably when the doped xerogel is heat-treated. The fluorescence intensity ratio (Y/B) is used as a measure of the symmetry of Dy3+ environment during the gel - glass conversion, the higher the ratio, the more asymmetric is the environment. The high value of the intensity ratio of the 1000°C heated gel showed that the Dy3+ was embedded in the glassy silica network with an asymmetric environment. The FTIR and thermo gravimetric analysis (TGA) clearly showed the complete densification (density=2.2 gm/cm3) of the gels around 1000°C.
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N. V. Unnikrishnan, N. V. Unnikrishnan, Vinoy Thomas, Vinoy Thomas, Gijo Jose, Gijo Jose, } "Structural evolution and fluorescence properties of Dy3+: silica matrix", Proc. SPIE 4905, Materials and Devices for Optical and Wireless Communications, (29 August 2002); doi: 10.1117/12.481057; https://doi.org/10.1117/12.481057

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