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Single molecule spectroscopy of red- and green-emitting fluorene-based copolymers

Khalil, G. E.; Adawi, A. M.; Fox, A. M.; Iraqi, A.; Lidzey, D. G.


G. E. Khalil

A. M. Fox

A. Iraqi

D. G. Lidzey


Single molecule fluorescence spectroscopy is used to study the optical properties of two polymers: a fluorene-based statistical copolymer that contains a low fraction (10%) of a red-emitting thiophene group, and the green-emitting polymer poly(9,9-dioctylfluorene-alt-benzothiadiazole). These polymers were studied when isolated at a low concentration in a polymer matrix (either polynorbornene or polystyrene). For the red-emitting polymer, we compare the relative emission intensity from the green-emitting benzothiadiazole groups with the red-emitting thiophene. We find that red emission from the thiophenes is significantly suppressed in the single molecule regime, suggesting that interchain energy transfer dominates intrachain processes in such polyfluorene copolymers. We then use fluorescence spectroscopy and polarization anisotropy measurements to show that the conformations of both polymers are dependent on their host matrix, adopting a more collapsed, globular conformation in polystyrene and a more extended chain conformation in polynorbornene.

Journal Article Type Article
Publication Date Feb 9, 2009
Print ISSN 0021-9606
Electronic ISSN 1089-7690
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 130
Issue 4
Article Number ARTN 044903
Pages 044903
APA6 Citation Khalil, G. E., Adawi, A. M., Fox, A. M., Iraqi, A., & Lidzey, D. G. (2009). Single molecule spectroscopy of red- and green-emitting fluorene-based copolymers. The Journal of chemical physics, 130(4), 044903. doi:10.1063/1.3054142
Keywords Physical and Theoretical Chemistry; General Physics and Astronomy