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Absorption and excitation spectra of fluorescently brightened fabrics

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Abstract

A method of measuring the reflectance and corrected excitation spectra of fluorescently brightened wool fabrics using a spectrofluorometer is described. From the reflectance spectra the fraction of incident radiation absorbed by the fluorescent brightener (FBA) on the fabrics was calculated, and it was shown that these absorption values differed significantly from the excitation spectra, and therefore the two spectra could not be regarded as interchangeable. The ratio of the excitation and absorption values indicates the relative fluorescence efficiency, and this ratio was shown to vary significantly with wavelength of excitation and concentration of FBA.

© 1975 Optical Society of America

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