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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 25 — Dec. 6, 2010
  • pp: 25738–25745

The polarized carbon nanotube thin film LED

Megumi Kinoshita, Mathias Steiner, Michael Engel, Joshua P. Small, Alexander A. Green, Mark C. Hersam, Ralph Krupke, Emilio E. Mendez, and Phaedon Avouris  »View Author Affiliations

Optics Express, Vol. 18, Issue 25, pp. 25738-25745 (2010)

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We demonstrate a light emitting p-i-n diode made of a highly aligned film of separated (99%) semiconducting carbon nanotubes, self-assembled from solution. By using a split gate technique, we create p- and n-doped regions in the nanotube film that are separated by a micron-wide gap. We inject p- and n-type charge carriers into the device channel from opposite contacts and investigate the radiative recombination using optical micro-spectroscopy. We find that the threshold-less light generation efficiency in the intrinsic carbon nanotube film segment can be enhanced by increasing the potential drop across the junction, demonstrating the LED-principle in a carbon nanotube film for the first time. The device emits infrared light that is polarized along the long axes of the carbon nanotubes that form the aligned film.

© 2010 OSA

OCIS Codes
(160.6000) Materials : Semiconductor materials
(230.3670) Optical devices : Light-emitting diodes
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:
Optical Devices

Original Manuscript: October 4, 2010
Revised Manuscript: November 10, 2010
Manuscript Accepted: November 10, 2010
Published: November 23, 2010

Megumi Kinoshita, Mathias Steiner, Michael Engel, Joshua P. Small, Alexander A. Green, Mark C. Hersam, Ralph Krupke, Emilio E. Mendez, and Phaedon Avouris, "The polarized carbon nanotube thin film LED," Opt. Express 18, 25738-25745 (2010)

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