Abstract
Fluorescence decay curves and time-resolved fluorescence spectra of N,N′-dioctadecylrhodamine B and N,N′-dioctadecyloxacyanine in Langmuir-Blodgett (LB) monolayers were measured using a picosecond time-resolved fluorescence spectrophotometer. The excitation energy relaxation processes of these dye molecules in monolayers were compared in the concentration range 0.01–30 mol.%. The mechanisms of energy relaxation are discussed in terms of the following: (i) energy migration between monomers with energetically disordered fractal sites for rhodamine B monolayers and between monomers with similar energy levels for oxacyanine monolayers, and (ii) energy trapping by two-dimensional aggregates.
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