Details of Grant 

EPSRC Reference:	GR/L98756/01
Title:	MODELLING OF POLYMER LIGHT-EMITTING DIODES
Principal Investigator:	Greenham, Professor N
Other Investigators:	Friend, Professor Sir R Cacialli, Professor F
Researcher Co-Investigators:
Project Partners:	Cambridge Display Technology Ltd (CDT)
Department:	Physics
Organisation:	University of Cambridge
Scheme:	Standard Research (Pre-FEC)
Starts:	01 October 1998	Ends:	30 June 2002	Value (£):	176,698
EPSRC Research Topic Classifications:	Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:	Electronics
Related Grants:
Panel History:
Summary on Grant Application Form
Polymer light-emitting diodes (LEDs) operate by recombination of charges injected from opposite electrodes in a thin-film device. Despite polymer LEDs being close to commercialisation in large-area displays, there is currently no well-accepted model to predict their electrical and optical characteristics based on the physical processes occurring in the device. In this project, we intend to develop a detailed model for polymer LEDs, taking into account both injection processes and the redistribution of electric fields due to internal space charge. The model will be developed and refined by comparison with the results of experiments on device structures designed to elucidate the important physical processes limiting device performance. Optical models to predict the efficiency and spectrum of radiative decay of molecules in dielectric structures will be extended to in include birefringent materials, and to quantify the coupling of light to waveguide modes. These models will then be used in conjunction with the recombination distributions calculated from the electrical modelling to study the spectrum and efficiency of emission from polymer LEDs. Electrical and optical modelling will be carried out in close collaboration with dedicated experimental measurements, taking advantage of state-of-the-art materials and device fabrication techniques provided by Cambridge Display Technology.
Key Findings
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Potential use in non-academic contexts
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Organisation Website:	http://www.cam.ac.uk