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Details of Grant 

EPSRC Reference: GR/K57428/01
Title: CHARACTERISATION OF DEFECT STATES IN ELECTROLUMINESCENT CONJUGATED POLYMERS AND OLIGOMERS
Principal Investigator: Bradley, Professor DDC
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Sharp Laboratories of Europe Ltd
Department: Physics and Astronomy
Organisation: University of Sheffield
Scheme: Standard Research (Pre-FEC)
Starts: 01 September 1995 Ends: 31 August 1998 Value (£): 182,671
EPSRC Research Topic Classifications:
Materials Characterisation
EPSRC Industrial Sector Classifications:
Manufacturing
Related Grants:
Panel History:  
Summary on Grant Application Form
The project will focus on detailed characterisation of the trap states and defect recombination centres found within conjugated polymer and oligomer films and the effects that they have on carrier injection, carrier transport, carrier combination, and subsequent exciton decay in electroluminescent diodes. This area has been little addressed in previous studies, though it is of great importance in establishing the suitability of new materials for device application, and in determining the optimal material processing and device fabrication protocols. It will also provide feedback to new and modified synthesis procedures. The studies to be undertaken will address the energetic positions, abundance spatial distribution and uniformity of distribution and charge state of traps and recombination centres and the dependence of their formation and nature on the processing and device fabrication procedures. The experimental methodology on which we propose to focus, namely Deep Level Transient Spectroscopy (DLTS) and related optical techniques, is one that is well established for inorganic semiconductors but it has not been used to study conjugated polymers before. The resulting insights will be of widespread interest to those working on the development of organic EL devices.
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Organisation Website: http://www.shef.ac.uk