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Details of Grant 

EPSRC Reference: GR/L41752/01
Title: ADVANCED POLYMERS FOR LIGHT-EMITTING DIODES
Principal Investigator: Bradley, Professor DDC
Other Investigators:
Burn, Professor P
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 1997 Ends: 31 August 2000 Value (£): 83,689
EPSRC Research Topic Classifications:
Materials Processing
EPSRC Industrial Sector Classifications:
Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
One of the significant advances in recent years in electronic materials for displays was the discovery that conjugated polymers such as poly(1,4-phenylenevinylene) could be used as the light-emitting layer in light-emitting diodes (LEDs). Polymers have now been developed which emit light across the whole of the visible spectrum. Many of these polymers although highly luminescent in the solid state are soluble in their conjugated form. This makes fabrication of the multilayer devices required for efficient light emission difficult. Our proposal seeks to address this problem and describes the synthetic routes towards and characterisation of insoluble forms of the efficient soluble light-emitting polymers. Characterisation of these materials and their incorporation in multilayer LED structures will also be undertaken. The synthetic approach involves preparation of high molecular weight precursor polymers followed by conversion in the solid state to the required conjugated polymers. We will also extend this work to the formation of copolymers. As a second part of the project we will attach luminescent and charge transport dopants to conjugated polymers to enhance device stability and the efficiency of light output. The polymers will be designed so that they will be insoluble in their conjugated form for ease of manufacturability into multilayer devices. This approach, using dopants, has proven very successful with evaporated molecular films, allowing commercially viable devices to be fabricated.
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Organisation Website: http://www.shef.ac.uk