Abstract
Fluorescence lifetimes of Scheibe-aggregates of Pseudoisocyanine chloride (PIC) in aqueous solution and of the PIC derivative 1-methyl-1′-octa-decyl-2,2′-cyanine perchlorate in stacks of molecular monolayers produced on glass substrates using the Langmuir-Blodgett technique have been measured. The decays are non-exponential and lifetimes depent on sample composition. Fluorescence lifetimes of the short-lived component in assemblies of 40 dye monolayers show a non-normal temperature dependence: τ293K=8.2 ps and τ143K=5.5 ps.
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