Abstract
Excitation energy relaxation of N,N′-dioctadecylrhodamine B incorporated in Langmuir-Blodgett monolayers has been studied with a picosecond time-resolved fluorescence spectrophotometer. Relaxation of singlet excitation energy in a monomolecular layer was interpreted in terms of (1) energy migration among different sites with a fractal-like distribution which are energetically or spatially disordered and (2) energy trapping by higher aggregates.
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