Sol-gel waveguides have been realized using a mixture of zirconium and titanium alkoxides with 3-Glycidoxypropyltrimethoxysilane (Glymo) as organic modifier. The molar ratio metal (Ti,Zr)/Glymo was 70/30 in order to obtain a material with high refractive index. Coumarin30 dye was added into the matrix during the synthesis with a concentration 2 x 10(-2) M. optical properties have been investigated by spectroscopic ellipsometry and UV-visible absorption measurements. Crack free 600 runt thick coatings were obtained with refractive index in the range 1.56-1.66, increasing with the Ti-content. Steady-state and time-resolved fluorescence measurements evidenced an almost linear decrease of the Coumarin30 fluorescence efficiency as Ti-content increases. Such a behaviour can be related to an excited state quenching mechanism. (Zr-0.5-Ti-0.5)(70)/Glymo(30) coating could be considered a fair trade-off between wiveguiding performance (n = 1.61; 12 dB/cm) and Coumarin30 fluorescence efficiency. (C) 2008 Elsevier B.V. All rights reserved.
X., L.g., Schutzmann, S., Stella, L., DE MATTEIS, F., Prosposito, P., Casalboni, M. (2008). Effect of titania content on the optical properties of dye-doped hybrid sol-gel coatings. OPTICAL MATERIALS, 31(2), 451-454 [10.1016/j.optmat.2008.06.009].
Effect of titania content on the optical properties of dye-doped hybrid sol-gel coatings
SCHUTZMANN, STEFANO;STELLA, LORENZO;DE MATTEIS, FABIO;PROSPOSITO, PAOLO;CASALBONI, MAURO
2008-01-01
Abstract
Sol-gel waveguides have been realized using a mixture of zirconium and titanium alkoxides with 3-Glycidoxypropyltrimethoxysilane (Glymo) as organic modifier. The molar ratio metal (Ti,Zr)/Glymo was 70/30 in order to obtain a material with high refractive index. Coumarin30 dye was added into the matrix during the synthesis with a concentration 2 x 10(-2) M. optical properties have been investigated by spectroscopic ellipsometry and UV-visible absorption measurements. Crack free 600 runt thick coatings were obtained with refractive index in the range 1.56-1.66, increasing with the Ti-content. Steady-state and time-resolved fluorescence measurements evidenced an almost linear decrease of the Coumarin30 fluorescence efficiency as Ti-content increases. Such a behaviour can be related to an excited state quenching mechanism. (Zr-0.5-Ti-0.5)(70)/Glymo(30) coating could be considered a fair trade-off between wiveguiding performance (n = 1.61; 12 dB/cm) and Coumarin30 fluorescence efficiency. (C) 2008 Elsevier B.V. All rights reserved.Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons
