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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
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
Copyright
Copyright © Materials Research Society 2005

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References

[1] Contoret, A. E. A., Farrar, S. R., Jackson, P. O., May, L., O'Neill, M., Nicholls, J. E., Richards, G. J., and Kelly, S. M., Adv. Mater., 12, 971 (2000).3.0.CO;2-J>CrossRefGoogle Scholar
[2] Contoret, A. E. A., Farrar, S. R., O'Neill, M., Nicholls, J. E., Richards, G. J., Kelly, S. M and Hall, A. W., Chem. Mater., 14, 1477 (2002).CrossRefGoogle Scholar
[3] Aldred, M. P., Eastwood, A. J., Kelly, S. M., Vlachos, P., Contoret, A. E. A., Farrar, S. R., Mansoor, B., O'Neill, M., and Tsoi, W. C., Chem. Mater. 16, 4928 (2004).CrossRefGoogle Scholar
[4] Aldred, M. P., Contoret, A. E. A., Farrar, S. R., Kelly, S. M., Mathieson, D., O'Neill, M., Tsoi, W. C. and Vlachos, P., Adv. Mater., 17, (2005) (in press).CrossRefGoogle Scholar
[5] Li, Z. H., Wong, M. S., Tao, Y. and Lu, J., Chem. Eur. J., (2005) (in press).Google Scholar
[6] Günter, R., Farrell, T., Scherf, U., Miteva, T., Yasuda, A. and Nelles, G., J. Mater Chem., 14, 2622 (2004).CrossRefGoogle Scholar
[7] Kelley, C. J., Ghiorghis, A. and Kauffman, J. M., J. Chem. Res. (M), 2710 (1997).Google Scholar
[8] Dyer, P. E., Farley, R. J., and Giedl, R., Opt. Commun. 115, 327 (1995).CrossRefGoogle Scholar

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