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Proceedings Paper

Thermodynamic constants for excimer formation and dissociation in oxidized poly(9,9-dioctylfluorene) (PFO)
Author(s): Marc Sims; Aristidis Asimakis; Marilu Ariu; Donal D.C. Bradley
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Paper Abstract

We have studied the temperature-dependent photoluminescence (PL) characteristics of oxidised PFO thin films at temperatures above 298K. We find the relative strength of the green emission band (g-band) to increase greatly at temperatures corresponding to the onset of crystallisation. Based on the proposal that the g-band arises from a fluorenone-based excimer, this finding would seem to indicate that a close approach of neighbouring fluorenone-containing segments may be energetically favourable. Finally, by successfully identifying diffusion-limited and dynamic equilibrium regimes within the temperature dependence of the ratio R=ID/IM, we extract an activation energy for excimer formation of ~ 0.05 eV and an excimer binding energy of ~ 0.51 eV. This is a relatively high binding energy for an excimer and lends credibility to the notion of an energetically favourable fluorenone:fluorenone coupling configuration, perhaps as a result of the considerable ground state dipole moments associated with the ketone group.

Paper Details

Date Published: 10 November 2004
PDF: 11 pages
Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); doi: 10.1117/12.567753
Show Author Affiliations
Marc Sims, Imperial College London (United Kingdom)
Aristidis Asimakis, Imperial College London (United Kingdom)
Marilu Ariu, Imperial College London (United Kingdom)
Donal D.C. Bradley, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 5519:
Organic Light-Emitting Materials and Devices VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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