Journal article
Film morphology and photophysics of polyfluorene
Physical review. B, Condensed matter and materials physics, Vol.62(23), pp.15604-15609
12/15/2000
DOI: 10.1103/PhysRevB.62.15604
Abstract
We have studied the interplay between photophysics and film morphology of poly(9,9-dioctyl)fluorene (PFO) using a variety of optical probes. Upon slowly warming a spin-cast PFO film from 80 to 300 K, a fraction of the sample is transformed into a different solid phase, the beta phase. Absorption and electroabsorption measurements show that the beta phase has more extended conjugation than the glassy phase. As a consequence, excited states of the beta phase are redshifted and have higher polarizability. The photoinduced absorption spectrum of a glassy PFO film is dominated by tripler excitons, whereas both polarons and triplet excitons are seen in a sample containing a fraction of the beta phase. The dependence of the photoinduced absorption and photocurrent upon the excitation wavelength shows that there is a clear link between polaron and triplet photogeneration.
Details
- Title: Subtitle
- Film morphology and photophysics of polyfluorene
- Creators
- A J Cadby - University of SheffieldP A LaneH Mellor - University of SheffieldS J MartinM Grell - University of SheffieldC Giebeler - University of SheffieldDDC Bradley - University of SheffieldM Wohlgenannt - University of UtahC An - University of UtahZ V Vardeny - University of Utah
- Resource Type
- Journal article
- Publication Details
- Physical review. B, Condensed matter and materials physics, Vol.62(23), pp.15604-15609
- DOI
- 10.1103/PhysRevB.62.15604
- NLM abbreviation
- Phys Rev B Condens Matter Mater Phys
- ISSN
- 1098-0121
- eISSN
- 1550-235X
- Publisher
- American Physical Society
- Number of pages
- 6
- Language
- English
- Date published
- 12/15/2000
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428832002771
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