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Interchain photoluminescence in substituted polyfluorenes
Dept. of Organ. Chem. and Polymer T., Chalmers University of Technology, S-412 96 Göteborg, Sweden.
Department of Chemical Physics, Chemical Center, Lund University, S-221 00 Lund, Sweden.
Department of Chemical Physics, Chemical Center, Lund University, S-221 00 Lund, Sweden.
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2001 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 119, no 1-3, 615-616 p.Article in journal (Refereed) Published
Abstract [en]

We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.

Place, publisher, year, edition, pages
2001. Vol. 119, no 1-3, 615-616 p.
Keyword [en]
Photoluminescence, Polyfluorenes and derivatives, Time-resolved fast spectroscopy, UV-Vis-Nir absorption
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47442DOI: 10.1016/S0379-6779(00)00788-8OAI: oai:DiVA.org:liu-47442DiVA: diva2:268338
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Inganäs, Olle

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