We investigated the optical properties of the saturable absorber 3,3′-diethyloxadicarbocyanine iodide incorporated in a matrix of silica-gel glass by the sol-gel technique. Absorption, emission, and fluorescence lifetime were studied as functions of the densification procedures. With respect to the liquid solutions, we observed a strong quenching of the P-isomer luminescence and an increase of the N-isomer fluorescence lifetime. These effects are ascribed to a restriction on the molecular photoisomerization rearrangement caused by the rigidity of the silica cage. Moreover, entrapping reduces intermolecular concentration effects. Finally, different from other glass-embedded dyes, both the absorption and the emission are blue-shifted by about 20 nm. © 1997 American Institute of Physics.
Casalboni, M., Senesi, R., Prosposito, P., DE MATTEIS, F., Pizzoferrato, R. (1997). Rigid-cage effects on the optical properties of the dye 3,3′ -diethyloxadicarbocyanine incorporated in silica-gel glasses. APPLIED PHYSICS LETTERS, 70(22), 2969-2971.
Rigid-cage effects on the optical properties of the dye 3,3′ -diethyloxadicarbocyanine incorporated in silica-gel glasses
CASALBONI, MAURO;SENESI, ROBERTO;PROSPOSITO, PAOLO;DE MATTEIS, FABIO;PIZZOFERRATO, ROBERTO
1997-01-01
Abstract
We investigated the optical properties of the saturable absorber 3,3′-diethyloxadicarbocyanine iodide incorporated in a matrix of silica-gel glass by the sol-gel technique. Absorption, emission, and fluorescence lifetime were studied as functions of the densification procedures. With respect to the liquid solutions, we observed a strong quenching of the P-isomer luminescence and an increase of the N-isomer fluorescence lifetime. These effects are ascribed to a restriction on the molecular photoisomerization rearrangement caused by the rigidity of the silica cage. Moreover, entrapping reduces intermolecular concentration effects. Finally, different from other glass-embedded dyes, both the absorption and the emission are blue-shifted by about 20 nm. © 1997 American Institute of Physics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.