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Title: Modelling ultrafast exciton transfer in fluorene-based organic semiconductors
Author: Denis, Jean-Christophe H.
ISNI:       0000 0004 6494 5847
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2014
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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.
Supervisor: Galbraith, Ian Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available