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Details of Grant 

EPSRC Reference: GR/M45115/02
Title: EXPERIMENTAL AND THEORETICAL STUDIES OF ELECTRICAL TRANSPORT IN ORGANIC ELECTROLUMINESCENT DEVICES
Principal Investigator: Bradley, Professor DDC
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Sharp Laboratories of Europe Ltd
Department: Physics
Organisation: Imperial College London
Scheme: Standard Research (Pre-FEC)
Starts: 01 March 2001 Ends: 30 November 2002 Value (£): 97,297
EPSRC Research Topic Classifications:
Materials Characterisation
EPSRC Industrial Sector Classifications:
Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
Organic light emitting diodes (OLEDs) based on electroluminescent small molecules and polymers have been proposed as the emissive element in displays and lighting. Despite the progress made in improving device performance, fundamental questions remain about the nature of the conduction mechanisms in OLEDs and the relationship between current, voltage and luminance. This proposal will address these issues by a joint experimental and theoretical study of one and two layer OLEDs made from a well characterised fluorene and aryl-amine polymers. Carrier mobility, extrinsic dopant density, bulk trap/interface state energy and density measurements will be made on single layer films and more complex structures. The measured current-voltage-luminance characteristics will then be modelled with a drift-diffusion code using these measurements as input parameters. The transport mechanisms, free and trapped carrier density profiles and recombination rate profiles can then be obtained. These can be correlated with impedance and internal field measurements. Once a successful model is available, the effect on device performance of varying such parameters as the mobility can be explored. Additional results for small molecular devices will be supplied by the industrial collaborator (SLE) for validation and subsequent exploitation of the model.
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Organisation Website: http://www.imperial.ac.uk