title: The polarized carbon nanotube thin film LED.
abstract: 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.
authors.affiliation: IBM TJ Watson Research Center, Yorktown Heights, NY 10598, USA.
authors.forename: Megumi
authors.initials: M
authors.lastname: Kinoshita
authors.forename: Mathias
authors.initials: M
authors.lastname: Steiner
authors.forename: Michael
authors.initials: M
authors.lastname: Engel
authors.forename: Joshua P
authors.initials: JP
authors.lastname: Small
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Green
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hersam
authors.forename: Ralph
authors.initials: R
authors.lastname: Krupke
authors.forename: Emilio E
authors.initials: EE
authors.lastname: Mendez
authors.forename: Phaedon
authors.initials: P
authors.lastname: Avouris
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D036103:Nanotechnology / Q000295:instrumentation*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D012031:Refractometry / Q000295:instrumentation*; D012666:Semiconductors
chemical_list: D037742:Nanotubes, Carbon