Large spectral diffusion of conjugated polymer single molecule fluorescence at low temperature

Summary, in English

The conductive polymer poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4- phenylene vinylene) (MEH-PPV) was investigated by means of single molecule spectroscopy at 15 K. MEH-PPV single chains were deposited onto a surface from a toluene solution and covered with a polymer cap layer spin-coated from an aqueous solution for protection from air. The MEH-PPV molecules exhibited large fluorescence spectral diffusion with the range reaching 1000 cm(-1). We concluded that conformational changes, affecting dispersive interactions and conjugation length, is the most probable mechanism of the observed effect. It is the matrix-free environment that allows the MEH-PPV chains to undergo sufficiently large conformational changes even at low temperature. (c) 2005 Elsevier B.V. All rights reserved.

• Author: Oleg Mirzov; Tönu Pullerits; F Cichos; C von Borczyskowski; Ivan Scheblykin
• Department/s: Chemical Physics
• Publishing year: 2005
• Language: English
• Pages: 317-321
• Publication/Series: Chemical Physics Letters
• Volume: 408
• Issue: 4-6
• Links: http://dx.doi.org/10.1016/j.cplett.2005.04.044
• Document type: Journal article
• Publisher: Elsevier
• Topic: Atom and Molecular Physics and Optics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0009-2614