The interchain origin of the green emission band in oxidised poly(9,9-dioctylfluorene) (PFO)

Marc Sims, Marilu Ariu, Aristidis Asimakis, Mattijs Koeberg, Mathias Stouff, Mark Fox, Donal D.C. Bradley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

We report systematic measurements of the evolution of the emission characteristics of PFO whilst undergoing photo-oxidation. Pure PFO and highly diluted PFO/polystyrene blended films were prepared for the studies by spin-coating. Each film was oxidised by exposure to the 351 nm line of a cw Ar+ laser. Both the kinetics of the various spectral components and the photoluminescence intensity for each film was monitored as a function of oxidation time and their respective behaviours were compared. Our results demonstrate that there is a strong tendency for singlet intrachain excitons initially created on pristine PFO segments to migrate to the fluorenone moieties produced by photo-oxidation. However, we conclusively show that emission from states localised at these defect sites cannot account for the appearance of the broad green emission band (g-band) that is well-known to occur in degraded polyfluorenes. Instead, it is shown that the g-band must emanate from interchain states that are formed after energy has been transferred to the fluorenone moieties (either via energy transfer from non-defective PFO segments or by direct excitation).
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
DOIs
StatePublished - May 3 2004
Externally publishedYes

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