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16 February 2004 The interchain origin of the green emission band in oxidized poly(9,9-dioctylfluorene) (PFO)
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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 oxidized 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 behaviors 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 localized 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 form non-defective PFO segments or by direct excitation).
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marc Sims, Marilu Ariu, Aristidis Asimakis, Mattijs Koeberg, Mathias Stouff, Mark Fox, and Donal D. C. Bradley "The interchain origin of the green emission band in oxidized poly(9,9-dioctylfluorene) (PFO)", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004);

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