HUMIDITY DEPENDENCE OF PHOTOLUMINESCENCE IN COUMARIN-4-DOPED SOL-GEL COATING FILM

Citation
Y. Takahashi et al., HUMIDITY DEPENDENCE OF PHOTOLUMINESCENCE IN COUMARIN-4-DOPED SOL-GEL COATING FILM, JPN J A P 2, 37(8B), 1998, pp. 982-984
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Applied
Volume
37
Issue
8B
Year of publication
1998
Pages
982 - 984
Database
ISI
SICI code
0021-4922(1998)37:8B<982:HDOPIC>2.0.ZU;2-2
Abstract
Coumarin 4 dye was doped in a silica matrix coated as a thin him by me ans of the sol-gel technique. The fluorescence intensity of the immobi lized dye was quenched by moisture. The humidity dependence of the flu orescence intensity was examined in the relative humidity range betwee n about 3 and 90% as a function of the concentration of coumarin 4 and catalytic aqueous HCl. The obtained results reveal that the fluoresce nces emitted from both the coumarin 4 monomer and the aggregates of dy e molecules are quenched by moisture and their quenching is explained by the Stern-Volmer equation.