Fate of Excitations in Conjugated Polymers: Single-Molecule Spectroscopy Reveals Nonemissive "Dark" Regions in MEH-PPV Individual Chains.

Summary, in English

Single chains of the conjugated polymer MEH-PPV (poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene)) were studied with wide-field fluorescence microscopy (dispersion in inert polymer matrices) and with fluorescence correlation spectroscopy (chloroform solution). The fluorescence yield of individual molecules in matrices was found to be 1-2 orders of magnitude lower than that in solution and it decreased substantially with increasing chain length. It suggests that isolation of MEH-PPV molecules in polymer matrices creates favorable conditions for photogeneration of nonemissive primary excited states.

• Författare: Hongzhen Lin; Yuxi Tian; Karolina Zapadka; Gustav Persson; Daniel Thomsson; Oleg Mirzov; Per-Olof Larsson; Jerker Widengren; Ivan Scheblykin
• Avdelning/ar: Kemisk fysik; Tillämpad biokemi
• Publiceringsår: 2009
• Språk: Engelska
• Sidor: 4456-4461
• Publikation/Tidskrift/Serie: Nano Letters
• Volym: 9
• Länkar: http://dx.doi.org/10.1021/nl9027473
• Dokumenttyp: Artikel i tidskrift
• Förlag: The American Chemical Society (ACS)
• Ämne: Nano Technology
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1530-6992