Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3006436
Keywords
carbon nanotubes; electrochemical electrodes; indium compounds; nanotube devices; organic light emitting diodes; polymers
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Funding
- AFOSR [FA-9550-05-1-04-09]
- Houston Advanced Research Center HARC
- NSF [DMI-0609115]
- Office of Naval Research MURI [N00014-08-1-0654]
- Robert A. Welch Foundation [AT-0029, AT 1617]
- CONACYT-UTD Ph.D. Scholarship
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We have fabricated efficient organic light emitting diodes using strong, transparent carbon nanotube (CNT) sheets as the hole-injecting anode. These devices show a brightness of 4500 cd/m(2) and current efficiency near 2.5 cd/A, which is close to the efficiency we achieve with a similar device, which uses indium tin oxide (ITO) as the anode. We demonstrate that proper planarization of the electrode using the water-soluble polymer poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) is necessary for achieving high efficiency and can be accomplished by spin casting multiple layers. We believe that increased conductivity of the sheets could lead to CNT-based devices with efficiencies exceeding those on ITO.
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