Conformational effects on the photophysics of conjugated polymers: a two species model for MEH-PPV spectroscopy and dynamics

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dc.contributor.author Collison, Christopher en_US
dc.contributor.author Rothberg, Lewis en_US
dc.contributor.author Treemaneekarn, Varaporn en_US
dc.contributor.author Li, Yi en_US
dc.date.accessioned 2006-07-19T19:32:20Z en_US
dc.date.available 2006-07-19T19:32:20Z en_US
dc.date.issued 2001-03-27 en_US
dc.identifier.citation Macromolecules 34N7 (2001) 2346-2352 en_US
dc.identifier.issn 1520-5835 en_US
dc.identifier.uri http://hdl.handle.net/1850/2147 en_US
dc.description.abstract We report transient and steady state photoluminescence results along with absorption and NMR data to support the existence of two distinct morphological species in MEH-PPV solutions. NMR data provide evidence for the close packing of polymer chains, a consequence of solvent quality reduction. These data are correlated with optical properties of the aggregated species in poor solvents and the isolated chains in good solvents. We infer that steric hindrance of backbone motions increases effective conjugation length and leads to a spectral red shift in absorption and emission. At the same time, interchain excitations with negligible luminescence can be formed, leading to a dramatic reduction in photoluminescence quantum yield. While spectral changes are observed as packing is induced, we show that interchain state formation and its subsequent back-transfer to excitons are particularly sensitive to the interchain registry of the highly packed chains. en_US
dc.description.sponsorship We gratefully acknowledge support from the NSF in Grant CHE 9120001. en_US
dc.format.extent 31371 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher The American Chemical Society: Macromolecules en_US
dc.subject Polymer chains en_US
dc.title Conformational effects on the photophysics of conjugated polymers: a two species model for MEH-PPV spectroscopy and dynamics en_US
dc.type Abstract en_US
dc.identifier.url http://dx.doi.org/10.1021/ma001354d

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