Skip to main content

Research Repository

Advanced Search

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.


Wing C. Tsoi

Ana Charas

Ashley J. Cadby

Gamal Khalil

Ahmed Iraqi

Barry Hunt

Jorge Morgado

David G. Lidzey


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.


Tsoi, W. C., Charas, A., Cadby, A. J., Khalil, G., Adawi, A. M., Iraqi, A., …Lidzey, D. G. (2008). Observation of the β-phase in two short-chain oligofluorenes. Advanced Functional Materials, 18(4), 600-606.

Journal Article Type Article
Online Publication Date Feb 4, 2008
Publication Date Feb 22, 2008
Print ISSN 1616-301X
Electronic ISSN 1616-3028
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 18
Issue 4
Pages 600-606
Keywords Structure-property relationships; Film morphology; Optical-spectra
Public URL
Publisher URL