Abstract
Energy transfer between two Langmuir-Blodgett films has been measured for the first time under conditions where both layers of dye are highly concentrated and J aggregated. The distance dependence of energy transfer was examined by the technique of interposing of a varying number of fatty acid layers between the dye layers. The efficiency of energy transfer was found to decrease with the fourth power of the distance. This is the behavior expected when the donor excitation is localized. For extensively delocalized excitation a quadratic dependence has been predicted. The strong resonance coupling between donor and acceptor in the present case results in efficient energy transfer over distances that are comparable with the expected delocalization of excitation in the donor aggregate so that the localized excitation model is appropriate. A three-dye system of J-aggregated dyes is also described. The efficiency of energy transfer from initial donor to ultimate acceptor is on the order of 90% over about 100 Å.
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