The polarized carbon nanotube thin film LED

Megumi Kinoshita, Mathias Steiner*, Michael Engel, Joshua P. Small, Alexander A. Green, Mark C. Hersam, Ralphxs Krupke, Emilio E. Mendez, Phaedon Avouris

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)25738-25745
Number of pages8
JournalOptics Express
Issue number25
StatePublished - Dec 6 2010
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'The polarized carbon nanotube thin film LED'. Together they form a unique fingerprint.

Cite this