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Proceedings Paper

Enhanced brightness in organic light-emitting diodes using a carbon nanotube composite as an electron-transport layer
Author(s): Patrick Fournet; Jonathan N. Coleman; Diarmuid F. O'Brien; Bernd Lahr; Anna Drury; Hans-Heinrich Hoerhold; Werner J. Blau
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Paper Abstract

We have studied the effects of using a composite fabricated from carbon nanotubes and a host polymer, poly(m-phenylene-vinylene-co-2,5-dioctyloxy-p-phenylene-viny lene) (PmPV), as an electron-transport layer in organic light-emitting diodes. Double layer devices using this composite as an electron-transport layer, triple layer devices with a composite electron-transport layer and poly(9-vinylcarbazole) (PVK) as a hole-transport layer, as well as poly(2,5-dimethoxy-1,4-phenylene-vinylene-2-methoxy-5(2'-eth ylhexyloxy)-1,4-phenylene-vinylene (M3EH-PPV) single layer devices were prepared. Current-voltage-luminance and electroluminescent spectral measurements were performed using six different nanotube powder to polymer mass ratios (0, 2, 4, 8, 16, and 32%) for all device structures studied. DC transport and photoluminescence behavior of the polymer-nanotube composite were also investigated. Although a potential barrier is introduced at the M3EH-PPV/composite interface, a significant increase in efficiency was observed using the composite. The best efficiency was obtained for those devices with an electron-transport layer of mass ratio 8%. In addition, on doping with nanotubes, electron conductivity in the composite increased by over four orders of magnitude with little quenching of photoluminescence.

Paper Details

Date Published: 27 February 2002
PDF: 9 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457481
Show Author Affiliations
Patrick Fournet, Trinity College (Ireland)
Jonathan N. Coleman, Trinity College (Ireland)
Diarmuid F. O'Brien, Univ. College Dublin (Ireland)
Bernd Lahr, Trinity College (Ireland)
Anna Drury, Trinity College (Ireland)
Hans-Heinrich Hoerhold, Friedrich-Schiller-Univ. Jena (Germany)
Werner J. Blau, Trinity College (Ireland)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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