Enhanced brightness in organic light-emitting diodes using a carbon nanotube composite as an electron-transport layer

Patrick Fournet; Jonathan N. Coleman; Diarmuid F. O'Brien; Bernd Lahr; Anna Drury; Hans-Heinrich Hoerhold; Werner J. Blau

doi:10.1117/12.457481

27 February 2002 Enhanced brightness in organic light-emitting diodes using a carbon nanotube composite as an electron-transport layer

Patrick Fournet, Jonathan N. Coleman, Diarmuid F. O'Brien, Bernd Lahr, Anna Drury, Hans-Heinrich Hoerhold, Werner J. Blau

Author Affiliations +

Proceedings Volume 4464, Organic Light-Emitting Materials and Devices V; (2002) https://doi.org/10.1117/12.457481
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

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Patrick Fournet, Jonathan N. Coleman, Diarmuid F. O'Brien, Bernd Lahr, Anna Drury, Hans-Heinrich Hoerhold, and Werner J. Blau "Enhanced brightness in organic light-emitting diodes using a carbon nanotube composite as an electron-transport layer", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457481

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