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

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.

• Författare: Oleg Mirzov; F Cichos; C von Borczyskowski; Ivan Scheblykin
• Avdelning/ar: Kemisk fysik
• Publiceringsår: 2004
• Språk: Engelska
• Sidor: 286-290
• Publikation/Tidskrift/Serie: Chemical Physics Letters
• Volym: 386
• Issue: 4-6
• Länkar: http://dx.doi.org/10.1016/j.cplett.2004.01.066
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Atom and Molecular Physics and Optics
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0009-2614