title: Electroluminescence from chirality-sorted (9,7)-semiconducting carbon nanotube devices.
abstract: We have measured the electroluminescence and photoluminescence of (9,7)-semiconducting carbon nanotube devices and demonstrate that the electroluminescence wavelength is determined by the nanotube's chiral index (n,m). The devices were fabricated on Si₃N₄-membranes by dielectrophoretic assembly of tubes from monochiral dispersion. Electrically driven (9,7)-devices exhibit a single Lorentzian-shaped emission peak at 825 nm in the visible part of the spectrum. The emission could be assigned to the excitonic E22 interband-transition by comparison of the electroluminescence spectra with corresponding photoluminescence excitation maps. We show a linear dependence of the EL peak width on the electrical current, and provide evidence for the inertness of Si₃N₄ surfaces with respect to the nanotubes optical properties.
authors: Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors: Martin H P
authors: MH
authors: Pfeiffer
authors: Ninette
authors: N
authors: Stürzl
authors: Christoph W
authors: CW
authors: Marquardt
authors: Michael
authors: M
authors: Engel
authors: Simone
authors: S
authors: Dehm
authors: Frank
authors: F
authors: Hennrich
authors: Manfred M
authors: MM
authors: Kappes
authors: Uli
authors: U
authors: Lemmer
authors: Ralph
authors: R
authors: Krupke