Oleg Mirzov
Systemarkitekt
Direct exciton quenching in single molecules of MEH-PPV at 77 K
Författare
Summary, in English
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.
Avdelning/ar
- Kemisk fysik
Publiceringsår
2004
Språk
Engelska
Sidor
286-290
Publikation/Tidskrift/Serie
Chemical Physics Letters
Volym
386
Issue
4-6
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0009-2614