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Details of Grant 

EPSRC Reference: GR/L01916/01
Title: CONJUGATED POLYMER MICROCAVITIES: LIGHT EMITTING DIODES AND NEW PHYSICS
Principal Investigator: Bradley, Professor DDC
Other Investigators:
Richardson, Dr TH Skolnick, Professor M Whittaker, Professor DM
Whittaker, Dr D
Researcher Co-Investigators:
Project Partners:
Department: Physics and Astronomy
Organisation: University of Sheffield
Scheme: Standard Research (Pre-FEC)
Starts: 01 March 1996 Ends: 30 November 1999 Value (£): 242,794
EPSRC Research Topic Classifications:
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Manufacturing
Related Grants:
Panel History:  
Summary on Grant Application Form
This research proposal concerns the design, fabrication and investigation of conjugated polymer semiconductor microcavity structures. Conjugated polymers are of strong interest technologically due to their potential for use as electrically pumped light emitting diodes (LEDs) and for large area displays. The emmission from conventional conjugated polymer LEDs is generally very broad (typically of order 0.5eV) due to both inhomogeneity and strong coupling of electonic and vibronic degrees of freedom. Emission colours are thus far from saturated. These difficulties can be overcome by the use of Fabry-Perot microcavity structures. Such microcavity structures lead to significant spectral narrowing of the emission band, enhancement of the peak intensity and directionally modified output. We have shown this very successfully in both our initial photoluminescence and electroluminescence structures, which have a emitting layer of the conjucagted polymer poly (2,5-dialkocy-p-phenylene vinlene) [PDAOPV} deposited in the cavity, between a metallic mirror and a distributed Bragg reflector.In our proposed work we intend to (1) increase te efficiency of the modified emission from LEDs, by using the following: electron transport layers indium-tin-oxide as the anode, mirror with higher reflectivity and polymers with large Stokes shift between absorption and emission. (2) to develop new and novel devices, such as LEDs and (3) to investigate new aspects of microcavity physics, particularly that of triplet emission, with the possibility of developing a laser. Use of Langmuir Blodgett films will allow us to study the physics of the emission - photon coupling more precisely.
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Organisation Website: http://www.shef.ac.uk