Viscosity dependence of the fluorescence lifetimes of cryptocyanine,pinacyanol and DDI |
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Authors: | Aud Tveito Eske K Razi Naqvi |
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Institution: | Institute of Physics, University of Trondheim, Norges Loererhøgskole, N-7000 Trondheim, Norway |
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Abstract: | Viscosity dependence of the fluorescence lifetimes of cryptocyanine, pinacyanol and I, I'-diethyl-2,2'-dicarbocyanine iodide (DDI) has been studied by making relative quantum yield measurements in five solvents. It has also been established. by means of flash kinetic spectroscopy, that, in rigid solvents, φoF+φoIC ≈ 1 for all three dyes, where φoF and φoIC stand for the intrinsic quantum yields of fluorescence emission and internal conversion, respectively. Values of the intrisic rate constant of internal conversion are also presented. |
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