Observation of the β-phase in two short-chain oligofluorenes

Tsoi, Wing C.; Charas, Ana; Cadby, Ashley J.; Khalil, Gamal; Adawi, Ali M.; Iraqi, Ahmed; Hunt, Barry; Morgado, Jorge; Lidzey, David G.

Abstract

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 & beta-phase is (30 ±12) monomer-units, a value consistent with the persistence length of the molecular chain. © 2008 WILEY-VCH Verlag GmbH & . Co. KGaA.

Citation

Tsoi, W. C., Charas, A., Cadby, A. J., Khalil, G., Adawi, A. M., Iraqi, A., Hunt, B., Morgado, J., & Lidzey, D. G. (2008). Observation of the β-phase in two short-chain oligofluorenes. Advanced Functional Materials, 18(4), 600-606. https://doi.org/10.1002/adfm.200700530

• Journal Article Type: Article
• Online Publication Date: Feb 4, 2008
• Publication Date: Feb 22, 2008
• Journal: ADVANCED FUNCTIONAL MATERIALS
• Print ISSN: 1616-301X
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 18
• Issue: 4
• Pages: 600-606
• DOI: https://doi.org/10.1002/adfm.200700530
• Keywords: Structure-property relationships; Film morphology; Optical-spectra
• Public URL: https://hull-repository.worktribe.com/output/400136
• Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.200700530