| EPSRC Reference: |
GR/M45115/02 |
| Title: |
EXPERIMENTAL AND THEORETICAL STUDIES OF ELECTRICAL TRANSPORT IN ORGANIC ELECTROLUMINESCENT DEVICES |
| Principal Investigator: |
Bradley, Professor DD |
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| Project Partners: |
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| Department: |
Physics |
| Organisation: |
Imperial College London |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 March 2001 |
Ends: |
30 November 2002 |
Value (£): |
97,297
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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Summary on Grant Application Form |
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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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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.imperial.ac.uk |