Details of Grant 

EPSRC Reference:	GR/M03634/01
Title:	POLYMERIC SEMICONDUCTORS FOR EFFICIENT LEDS
Principal Investigator:	Holmes, Professor AB
Other Investigators:	Cacialli, Professor F Friend, Professor Sir R Greenham, Professor N
Researcher Co-Investigators:
Project Partners:	Cambridge Display Technology Ltd (CDT) Philips
Department:	Chemistry
Organisation:	University of Cambridge
Scheme:	Standard Research (Pre-FEC)
Starts:	01 October 1998	Ends:	30 April 2002	Value (£):	212,362
EPSRC Research Topic Classifications:	Materials Characterisation Materials Synthesis & Growth
EPSRC Industrial Sector Classifications:	Electronics
Related Grants:
Panel History:
Summary on Grant Application Form
The programme consists of the joint efforts between a post doctoral (Melville Lab) and a PhD student (Cavendish Lab) to work in an interdisciplinary collaboration to synthesise and evaluate new materials for improvements in performance (efficiency and lifetimes) for polymer LEDs. Two priorities in new materials have been identified Polymers with good emission at short wavelength will be prepared and evaluated. Then attention will be directed to overall improvements in device performance by improving supramolecular order in emissive polymer materials. Short wavelength emissive materials will be prepared using the existing methodology (dehydrohalogenation condensation and organometallic cross coupling polymerisation). Excimer emission will be avoided by local steric disorder involving twisting of aromatic rings and by control of non-radiative decay pathways using blends of polymers carrying similar but not identical chromophores which will allow the emissive layer to be diluted in a semiconducting matrix. The device evaluation programme will evaluate the new materials with particular emphasis on measuring optical and electrical properties and fabrication of LED devices. Lifetime measurements will be carried out by the industrial partner.
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Organisation Website:	http://www.cam.ac.uk