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Modelling ultrafast exciton transfer in fluorene-based organic semiconductors

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DenisJC_0214_eps.pdf (16.83Mb)
Date
2014-02
Author
Denis, Jean-Christophe H.
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Abstract
We present a theoretical study of exciton dynamics in solutions and films of fluorene-based molecules, complemented by experimental work carried out by our colleagues at the University of St Andrews. We start by introducing the importance and relevance of such a study, and the methods we use to model ultra-fast (picoand sub-picosecond) exciton photo-physics in these systems. We then demonstrate that exciton transfer in solution of some branched star-shaped oligofluorene-based molecules arises from molecular geometry relaxation, and, at a slower time-scale, from F¨orster hopping between the arms. Straight oligofluorenes do not exhibit ultra-fast exciton transfer in solution. Finally, we introduce improvements to the standard line-dipole theory which we use to build a microscopic model for ultra-fast exciton dynamics in polyfluorene films. Our results show very good agreement with experiments and enable us to gain fundamental insight into the exciton transfer processes in these materials.
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http://hdl.handle.net/10399/3247
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©Heriot-Watt University, Edinburgh, Scotland, UK EH14 4AS.

Maintained by the Library
Tel: +44 (0)131 451 3577
Library Email: libhelp@hw.ac.uk
ROS Email: open.access@hw.ac.uk

Scottish registered charity number: SC000278

  • About
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AboutCopyright
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