Fluorescence of Optical Brighteners Brightening is neither bleaching nor blueing. Fluorescent colours will reflect more light than they can absorb from the visible range of the spectrum. Whiteness can also be increased by using substances which would give colourless solutions but were strongly fluorescent. Fluorescence is produced by the absorption of radiation having a high energy on the part of the molecule, which re-emits this radiation as a radiation of lower energy i.e. of longer wavelength, the difference in energy being transformed in to kinetic energy. To enable a molecule to fulfill this function, it must be built according to certain structural principles. For example Anthranilic acid has very strong blue violet fluorescence in its aqueous solution, but nevertheless unsuitable as a brightener.
Posted on: Thu, 16 Jan 2014 03:15:07 +0000
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