Oleg Mirzov
System architect
Direct exciton quenching in single molecules of MEH-PPV at 77 K
Author
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.
Department/s
- Chemical Physics
Publishing year
2004
Language
English
Pages
286-290
Publication/Series
Chemical Physics Letters
Volume
386
Issue
4-6
Document type
Journal article
Publisher
Elsevier
Topic
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Other
- ISSN: 0009-2614