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Details of Grant 

EPSRC Reference: GR/R05116/01
Title: Optical Excitations In Semiconducting Polymers
Principal Investigator: de Mello, Professor J
Other Investigators:
Researcher Co-Investigators:
Project Partners:
University of Cambridge
Department: Chemistry
Organisation: Imperial College London
Scheme: Fast Stream
Starts: 01 September 2000 Ends: 28 February 2003 Value (£): 59,865
EPSRC Research Topic Classifications:
Complex fluids & soft solids
EPSRC Industrial Sector Classifications:
Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
The nature of the primary photo-excitation is of central importance in the field of polymer semiconductor research and has far reaching implications for a wide range of electronic devices, including emissive displays, photocells and electrically pumped organic lasers. The strenght of binding between photoexcited electron-hole pairs (the excition binding energy) is particularly important in this respect as it places theoretical limits on the efficiencies of many optoelectronic devices.To date, measurements of the binding energy have been inconclusive, and its magnitude is the subject of continuing debate. Field-induced fluorescence quenching measurements have been successfully used to investigate binding energy in a wide range of molecular materials, but attempts to extend their use to polymeric systems have proved problematic. In this proposal, we describe a revised approach to fluorescence quenching which, in conjunction with electroabsorption spectroscopy, offers a reliable means of investigating excition binding energy in polymeric systems.The findings of the research programme are expected to provide a detailed insight into the ways in which the structural conformational properties of the host polymer determine the properties of the excition. This in turn should provide a strong basis for improving the performance of optoelectronic devices by chemically 'tuning' the properties of the polymer. (Key words:Optoelectronic devices)
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Organisation Website: http://www.imperial.ac.uk