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Light-emitting Polymerizable Liquid Crystals: Micron Scale Photolithographic Patterning and Green Electroluminescence.

Published online by Cambridge University Press:  01 February 2011

Matthew P. Aldred ,
Adam E. A. Contoret ,
Peter E. Devine ,
Simon R. Farrar ,
Robert Hudson ,
Stephen M. Kelly ,
Gene C. Koch ,
Mary O'Neill ,
Wing C. Tsoi  and
Kai L. Woon
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Matthew P. Aldred
Affiliation:
Department of Chemistry, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Adam E. A. Contoret
Affiliation:
ZLX Techno Ltd., 3 Trinity Lane, Beverley, HU17 0DY, United Kingdom
Peter E. Devine
Affiliation:
ZLX Techno Ltd., 3 Trinity Lane, Beverley, HU17 0DY, United Kingdom
Simon R. Farrar
Affiliation:
Department of Physics, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Robert Hudson
Affiliation:
Department of Physics, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Stephen M. Kelly
Affiliation:
Department of Chemistry, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Gene C. Koch
Affiliation:
ZLX Techno Ltd., 3 Trinity Lane, Beverley, HU17 0DY, United Kingdom
Mary O'Neill
Affiliation:
Department of Physics, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Wing C. Tsoi
Affiliation:
Department of Physics, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Kai L. Woon
Affiliation:
Department of Physics, University of Hull, Cottingham Rd., Hull, HU6 7RX, United Kingdom
Panos Vlachos
Affiliation:
ZLX Techno Ltd., 3 Trinity Lane, Beverley, HU17 0DY, United Kingdom
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Abstract

We report the synthesis of photoreactive and light-emitting liquid crystals which can be patterned photolithographically to form polymer networks for use in organic light-emitting diodes. The resolution capability of the photopatterning is investigated using a phase mask of period one micron to spatially modulate the irradiance of ultraviolet light incident to the monomer thin film. A surface relief grating of the same period and depth 85 nm is formed on exposure and washing. An OLED incorporating a novel green light-emitting liquid-crystal has a luminous efficiency of 4.3 lm W-1 at 100 cd m-2 and gives a luminance of 990 cd m-2 at an operating voltage of 10 V.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 871: Symposium I – Organic Thin-Film Electronics , 2005 , I10.7
Copyright
Copyright © Materials Research Society 2005

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References

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