Rigid-cage effects on the optical properties of the dye 3,3'-diethyloxadicarbocyanine incorporated in silica-gel glasses

被引:52
作者
Casalboni, M
Senesi, R
Prosposito, P
DeMatteis, F
Pizzoferrato, R
机构
[1] UNIV ROMA TOR VERGATA,IST NAZL FIS MAT,I-00133 ROME,ITALY
[2] UNIV ROMA TOR VERGATA,DIPARTIMENTO INGN MECCAN,I-00133 ROME,ITALY
关键词
D O I
10.1063/1.118759
中图分类号
O59 [应用物理学];
学科分类号
摘要
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. (C) 1997 American Institute of Physics.
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页码:2969 / 2971
页数:3
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