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- W1972029692 abstract "Integrated three-pulse stimulated echo peak shift data are compared for N,N-bis-dimethylphenyl-2,4,6,8-perylenetetracarbonyl diamide and $mathrm{poly}[{2ensuremath{-}(2}^{ensuremath{'}}ensuremath{-}mathrm{ethylhexyloxy})ensuremath{-}5ensuremath{-}mathrm{methoxy}ensuremath{-}1,4ensuremath{-}mathrm{phenylenevinylene}]$ (MEH-PPV) in toluene solvent. These two molecules represent a model probe of solvation dynamics and a prototypical soluble, electroluminescent conjugated polymer, respectively. The results indicate that it is inappropriate to describe the linear absorption spectrum of MEH-PPV as being primarily inhomogeneously broadened. Conformational disorder along the polymer backbone gives rise to an ensemble of polyene electronic oscillators that are strongly coupled to each other. As a consequence, fluctuations in the electronic energy gap on a time-scale of 50-fs derive primarily from bath-mediated exciton scattering. The data reported here provide an explanation for the broad, structureless electronic absorption of MEH-PPV. This interpretation provides a valuable insight into the nature of the initial photoexcited state, and the efficient population of the emissive state." @default.
- W1972029692 created "2016-06-24" @default.
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- W1972029692 date "2000-05-15" @default.
- W1972029692 modified "2023-10-09" @default.
- W1972029692 title "Origin of line broadening in the electronic absorption spectra of conjugated polymers: Three-pulse-echo studies of MEH-PPV in toluene" @default.
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- W1972029692 doi "https://doi.org/10.1103/physrevb.61.13670" @default.
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