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dc.contributor.authorRakchart Traipholen_US
dc.contributor.authorPatrapon Sanguansaten_US
dc.contributor.authorToemsak Srikhirinen_US
dc.contributor.authorTeerakiat Kerdcharoenen_US
dc.contributor.authorTanakorn Osotchanen_US
dc.contributor.otherNaresuan Universityen_US
dc.contributor.otherMahidol Universityen_US
dc.identifier.citationMacromolecules. Vol.39, No.3 (2006), 1165-1172en_US
dc.description.abstractA relationship between conformation and photophysics of poly[2-methoxy-5-(2′-ethylhexoxy)-p-phenylenevinylene] (MEH-PPV) in dilute solution was investigated by utilizing UV/vis absorption, excitation, and emission spectroscopy. By tuning polymer-solvent interactions, a control of conjugation length which relates to state of chain collapse is achieved. Position of absorption and emission spectra can be systematically moved within 60 nm by using a series of alcohols and aromatic solvents as well as mixed solvents. In addition to a decrease of conjugation length, the collapsed chain exhibit optical characteristics different from that of the extended counterpart. While a single type of emitter is present in the extended chain, separate emission from multiple emitters with various conjugation lengths is detected from the collapsed coils. Fluorescence decay measurements support the presence of multiple emitters. Studies of UV/vis absorption and photoluminescence upon increasing temperature detect a blue shift of transition energies and a decrease of absorption and emission efficiency. In addition, rate of the shift is found to decrease with increasing magnitude of chain collapse. © 2006 American Chemical Society.en_US
dc.rightsMahidol Universityen_US
dc.subjectMaterials Scienceen_US
dc.titleSpectroscopic study of photophysical change in collapsed coils of conjugated polymers: Effects of solvent and temperatureen_US
Appears in Collections:Scopus 2006-2010

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