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Direct exciton quenching in single molecules of MEH-PPV at 77 K

Mirzov, Oleg LU ; Cichos, F; von Borczyskowski, C and Scheblykin, Ivan LU (2004) In Chemical Physics Letters 386(4-6). p.286-290
Abstract
Fluorescence blinking behaviour was observed for single molecules of the conjugated polymer poly[2-methoxy,5-(2'-ethylhexyloxy)-p-phenylene-vinylene] (MEH-PPV) at 77 and 300 K. No strict qualitative dependence on temperature was observed, despite of the expected suppression of exciton migration at the low temperature. We assume MEH-PPV molecules to form dense nanoparticles with a characteristic size of about 10 nm at the largest. In such small nanoparticles exciton can be efficiently quenched by a photogenerated quencher due to Forster transfer just after a few hops over the polymer nanoparticle. Thus, long-distance exciton migration is not necessary to have strong fluorescence intensity fluctuations. (C) 2004 Elsevier B.V. All rights... (More)
Fluorescence blinking behaviour was observed for single molecules of the conjugated polymer poly[2-methoxy,5-(2'-ethylhexyloxy)-p-phenylene-vinylene] (MEH-PPV) at 77 and 300 K. No strict qualitative dependence on temperature was observed, despite of the expected suppression of exciton migration at the low temperature. We assume MEH-PPV molecules to form dense nanoparticles with a characteristic size of about 10 nm at the largest. In such small nanoparticles exciton can be efficiently quenched by a photogenerated quencher due to Forster transfer just after a few hops over the polymer nanoparticle. Thus, long-distance exciton migration is not necessary to have strong fluorescence intensity fluctuations. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemical Physics Letters
volume
386
issue
4-6
pages
286 - 290
publisher
Elsevier
external identifiers
  • wos:000220124700012
  • scopus:1442311994
ISSN
0009-2614
DOI
10.1016/j.cplett.2004.01.066
language
English
LU publication?
yes
id
6d370920-d312-43f4-b9ae-9e95717daefe (old id 139105)
date added to LUP
2007-07-03 14:19:40
date last changed
2017-08-27 05:07:03
@article{6d370920-d312-43f4-b9ae-9e95717daefe,
  abstract     = {Fluorescence blinking behaviour was observed for single molecules of the conjugated polymer poly[2-methoxy,5-(2'-ethylhexyloxy)-p-phenylene-vinylene] (MEH-PPV) at 77 and 300 K. No strict qualitative dependence on temperature was observed, despite of the expected suppression of exciton migration at the low temperature. We assume MEH-PPV molecules to form dense nanoparticles with a characteristic size of about 10 nm at the largest. In such small nanoparticles exciton can be efficiently quenched by a photogenerated quencher due to Forster transfer just after a few hops over the polymer nanoparticle. Thus, long-distance exciton migration is not necessary to have strong fluorescence intensity fluctuations. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Mirzov, Oleg and Cichos, F and von Borczyskowski, C and Scheblykin, Ivan},
  issn         = {0009-2614},
  language     = {eng},
  number       = {4-6},
  pages        = {286--290},
  publisher    = {Elsevier},
  series       = {Chemical Physics Letters},
  title        = {Direct exciton quenching in single molecules of MEH-PPV at 77 K},
  url          = {http://dx.doi.org/10.1016/j.cplett.2004.01.066},
  volume       = {386},
  year         = {2004},
}