Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-13T22:16:37.317Z Has data issue: false hasContentIssue false
  • English
  • Français

LECs Made of m-Lppp

Published online by Cambridge University Press:  10 February 2011

F. P. Wenzl ,
S. Tasch ,
J. Gao ,
L. Holzer ,
U. Scherf ,
A.J. Heeger  and
G. Leising
F. P. Wenzl
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
S. Tasch
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
J. Gao
Affiliation:
Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara,California 93106-5090, USA
L. Holzer
Affiliation:
Max-Planck-Institut für Polymerforschung, Ackermannweg 10, D-55128, Mainz, Germany
U. Scherf
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
A.J. Heeger
Affiliation:
Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara,California 93106-5090, USA
G. Leising
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
Get access

Abstract

We report the application of the blue light emitting conjugated polymer m-LPPP (methyl substituted laddertype poly(paraphenylene) ) in light emitting electrochemical cells. The active layer of the LEC consists of a blend of m-LPPP with the ionically conductive polymer PEO and LiCF3SO3 as ionic salt. Investigations of different concentrations of PEO and salt showed that the best LECs made of m-LPPP up to now where realised with an active layer consisting of a blend of m-LPPP:PEO:salt in the range of 20:10:3. In this case we are able to realise LECs with response times in the range of 30 μs. The I/U characteristics show low turn on voltages both for current and electroluminescence, but only in the case of ITO biased as a cathode. The initial electroluminescence spectra are quite the same as those for LEDs made of m-LPPP but turn into green after some time of operation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 57
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Burroughes, J. H., Bradley, D. D. C., Brown, A. R., Marks, R. N., Mackay, K., Friend, R. H., Burn, P. L., Kraft, A., Holmes, A. B., Nature 347, 539 (1990).Google Scholar
2. Braun, D., Heeger, A. J., Appl. Phys. Lett. 68, 1982 (1991).Google Scholar
3. Grem, G., Leditzky, G., Ullrich, B., Leising, G., Adv. Mater. 4, 36 (1992).Google Scholar
4. Greenham, N. C., Moratti, S. C., Bradley, D. D. C., Friend, R. H., Holmes, A. B., Nature 365, 628 (1993).Google Scholar
5. Ohmori, Y., Uchido, M., Muro, K., and Yoshino, K., Jpn. J. Appl. Phys. 30, L1938 (1991).Google Scholar
6. Tang, C. W., Williams, D. J., Chang, J. C., US-Patent 5,294,870 (1994).Google Scholar
7. Matsura, M., Tokailin, H., Eida, M., Hosokawa, C., Hironaka, Y. and Kusumoto, T., Proc. Asia Diplay '95, 269 (1995).Google Scholar
8. Tasch, S., Brandstätter, C., Meghdadi, F., Leising, G., Froyer, G., Athouel, L., Adv. Mater. 9, 33(1997)Google Scholar
9. Pei, Q., Yu, G., Zang, C., Yang, Y., Heeger, A. J., Science 269, 1086 (1995).Google Scholar
10. Pei, Q., Yang, Y., Yu, G., Zhang, C., and Heeger, A.J., J. Am. Chem. Soc. 118,3922 (1996).Google Scholar
11. Pei, Q., Yang, Y., Synth. Met. 80, 131 (1996).Google Scholar
12. Cao, Y., Yu, G., Heeger, A.J., Yang, C.Y., Appl. Phys. Lett. 68, 3218 (1996).Google Scholar
13. Tasch, S., Niko, A., Leising, G., Scherf, U., Appl. Phys. Lett. 68, 1090 (1996)Google Scholar
14. Meinhard, G., Horvath, A., Weiser, G., Leising, G., Syth. Met. 84, 669 (1997)Google Scholar
15. Yang, Y., Q. Pei,J. Appl. Phys. 81,3294 (1997)Google Scholar
16. Tasch, S., Gao, J., Wenzl, F.P., Scherf, U., Müllen, K., Leising, G., A.J. Heeger (unpublished)Google Scholar