Development of temporal spectroscopic properties for Xerogel matrices doped with Rhodamine 6G dye

Abstract

Abstract:The solid host of a laser dye modifies its spectroscopic properties with respect to its liquid host. During the Sol-Gel process the dye molecules suffer from changing their environment. Two parameters affect this matter, the change in the concentration due to the evaporation of the solvent (drying) and the caging of dye molecules inside the pores or attachment to the silica network. Rhodamine 6G absorption and fluorescence spectra with different concentrations, during Sol-Gel time processing, have been studied. Both, absorption and fluorescence spectra of the dye in the solid host, for different concentrations, show a blue-shift relative to its liquid phase.

Photoluminescence analysis for terbium β-diketonate complex-based silica xerogel matrices

“…According to Eq. (1), the absorbed intensity (I a = I 0 -I) of the light by the sample and also the absorbance A (=log I 0 /I) are expected to increase with an increase in the concentration (in the absence of any bimolecular effects) [30]. The FWHM for both bands kept unchanged &7 nm, even at such higher doping concentration; consequently no saturation occurs.…”

“…The access of Tb ?3 ions, according to the concentration quenching effect, may vary the host field around Tb ?3 ions; thus perturbing the lowest stark component of the emission state of Tb ?3 ions. Hence, besides the perturbations mentioned above, further bimolecular processes may modify the emission spectrum and cause the observed spectral shift [30].…”