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Fate of Excitations in Conjugated Polymers: Single-Molecule Spectroscopy Reveals Nonemissive "Dark" Regions in MEH-PPV Individual Chains
KTH, School of Engineering Sciences (SCI), Applied Physics, Experimental Biomolecular Physics.
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2009 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 9, no 12, 4456-4461 p.Article in journal (Refereed) Published
Abstract [en]

Single chains of the conjugated polymer MEH-PPV (poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene)) were studied with wide-field fluorescence microscopy (dispersion in inert polymer matrices) and with fluorescence correlation spectroscopy (chloroform solution). The fluorescence yield of individual molecules in matrices was found to be 1-2 orders of magnitude lower than that in solution and it decreased substantially with increasing chain length. It suggests that isolation of MEH-PPV molecules in polymer matrices creates favorable conditions for photogeneration of nonemissive primary excited states.

Place, publisher, year, edition, pages
2009. Vol. 9, no 12, 4456-4461 p.
Keyword [en]
electronic-energy transfer, low-temperature, phenylenevinylene, polymers, fluorescence blinking, spectral diffusion, dynamics, photophysics, dependence, aggregation
URN: urn:nbn:se:kth:diva-19012DOI: 10.1021/nl9027473ISI: 000272395400086ScopusID: 2-s2.0-71949085507OAI: diva2:337059
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-31Bibliographically approved

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Persson, GustavWidengren, Jerker
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