Phonon-Assisted Electroluminescence from Metallic Carbon Nanotubes and Graphene

• DOI: 10.1021/nl9039795
• Publication Date: 2010-04-20T12:23:10Z
• Authors: S. Essig; C. W. Marquardt; A. Vijayaraghavan; M. Ganzhorn; S. Dehm; F. Hennrich; F. Ou; A. A. Green; C. Sciascia; F. Bonaccorso; K.-P. Bohnen; H. v. Löhneysen; M. M. Kappes; P. M. Ajayan; M. C. Hersam; A. C. Ferrari; R. Krupke
• Keywords: Luminescent Measurements: methods; ddc:500; info:eu-repo/classification/ddc/540; Crystallization: methods; Macromolecular Substances: chemistry; Macromolecular Substances; Surface Properties; ddc:540; Chemistry & allied sciences; Carbon: chemistry; phonons; Molecular Conformation; Metals: chemistry; 02 engineering and technology; 7. Clean energy; electroluminescence; Materials Testing; Electrochemistry; Nanotechnology; Particle Size; NATURAL sciences & mathematics; Nanotechnology: methods; Photons; Nanotubes; carbon nanotubes; Nanotubes, Carbon; graphene; 500; 540; Carbon; Electrochemistry: methods; Graphite: chemistry; Metals; Luminescent Measurements; Graphite; Crystallization; 0210 nano-technology; info:eu-repo/classification/ddc/500

We report on light emission from biased metallic single-wall carbon nanotube (SWNT), multiwall carbon nanotube (MWNT) and few-layer graphene (FLG) devices. SWNT devices were assembled from tubes with different diameters in the range 0.7-1.5 nm. They emit light in the visible spectrum with peaks at 1.4 and 1.8 eV. Similar peaks are observed for MWNT and FLG devices. We propose that this light emission is due to phonon-assisted radiative decay from populated pi* band states at the M point to the Fermi level at the K point. Since for most carbon nanotubes as well as for graphene the energy of unoccupied states at the M point is close to 1.6 eV, the observation of two emission peaks at approximately 1.6 +/- approximately 0.2 eV could indicate radiative decay under emission or absorption of optical phonons, respectively.