Energy transfer dynamics in polyfluorene-based polymer blends

The Förster energy transfer mechanisms in polyfluorene-based polymer blends have been investigated by picosecond time-resolved photoluminescence spectroscopy. Blends of poly(9,9-dioctylfluorene), (F8), and poly(9,9-dioctylfluorene-co-benzothiadiazole), (BT), ranging from 50% to 0.01% BT have been in...

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Bibliographic Details
Published in:Chemical physics letters 2001-05, Vol.339 (5), p.331-336
Main Authors: Buckley, A.R., Rahn, M.D., Hill, J., Cabanillas-Gonzalez, J., Fox, A.M., Bradley, D.D.C.
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:The Förster energy transfer mechanisms in polyfluorene-based polymer blends have been investigated by picosecond time-resolved photoluminescence spectroscopy. Blends of poly(9,9-dioctylfluorene), (F8), and poly(9,9-dioctylfluorene-co-benzothiadiazole), (BT), ranging from 50% to 0.01% BT have been investigated from room temperature down to 12 K. In high concentration BT/F8 films, nearest neighbour transfers from F8 to BT, characterised by an F8 fluorescence lifetime of 12 ps, totally dominate. In low concentration BT/F8 films energy transfer between F8 and BT still occurs at nearest neighbour sites, but exciton migration to these sites amongst F8 chain segments now also contributes to the measured dynamics.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(01)00359-1