Abstract
The system consisting of anionic dye fluorescein with inorganic ions in aqueous solution generates photovoltage when studied in photogalvanic cell. Fluorescein dye produces much greater photovoltage compared to other anionic dye phloxin (2,4,5,7-tetrabromo-3',4',5',6'-tetrachlorofluorescein) and cationic dye safranine T (3,6-diamino-2,7-dimethyl-5-phenylphenazinium chloride). The open-circuit photovoltage, the short-circuit current and solar energy efficiency of these systems have been determined. The fluorescence intensity of the dye safranine T and phloxin is quenched in presence of the ions studied while fluorescence intensity of fluorescein is enhanced in the presence of the ions. The absorption spectra of the dye are not perturbed in the presence of the ions indicating no molecular interaction between the dyes in the ground state and the ions. The Stern-Volmer quenching constant and rate constant of growth of photovoltage have been calculated. The experimental evidences support the excited state interaction of the dyes with the ions studied.
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