We enthusiastically thank William Barford for valuable discussions. This work was funded via the EU FP6 STREP project POLYCOM (FP6-026365) and by the UK EPSRC via research grant ‘Nanoscale organic-photonic structures’ (EP/D064767/1).
Observation of the β-Phase in Two Short-Chain Oligofluorenes†
Article first published online: 4 FEB 2008
Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 18, Issue 4, pages 600–606, February 22, 2008
How to Cite
Tsoi, W. C., Charas, A., Cadby, A. J., Khalil, G., Adawi, A. M., Iraqi, A., Hunt, B., Morgado, J. and Lidzey, D. G. (2008), Observation of the β-Phase in Two Short-Chain Oligofluorenes. Adv. Funct. Mater., 18: 600–606. doi: 10.1002/adfm.200700530
- Issue published online: 28 FEB 2008
- Article first published online: 4 FEB 2008
- Manuscript Revised: 6 SEP 2007
- Manuscript Received: 14 MAY 2007
- EU FP6 STREP project POLYCOM. Grant Number: FP6-026365
- UK EPSRC via research grant ‘Nanoscale organic-photonic structures’. Grant Number: EP/D064767/1
The polymer poly(9,9-dioctylfluorene) (PF8) can be driven into a morphological form termed the β-phase that has enhanced planarity and increased structural rigidity. We show that the β-phase can be generated in two different fluorene oligomers; a fluorene pentamer, and a short (statistical) oligomer composed of chains having a maximum length of 19 monomer units. By comparing the energy of the zero-zero phonon line in fluorescence from the β-phase oligomers with that in the PF8 polymer, we show that the electronic conjugation length of the β-phase is (30 ± 12) monomer-units, a value consistent with the persistence length of the molecular chain.