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Phonon-Assisted Electroluminescence from Metallic Carbon Nanotubes and Graphene

Essig, S. and Marquardt, C. W. and Vijayaraghavan, A. and Ganzhorn, M. and Dehm, S. and Hennrich, F. and Ou, F. and Green, A. A. and Sciascia, C. and Bonaccorso, F. and Bohnen, K.-P. and Löhneysen, H. v. and Kappes, M. M. and Ajayan, P. M. and Hersam, M. C. and Ferrari, A. C. and Krupke, R. (2010):
Phonon-Assisted Electroluminescence from Metallic Carbon Nanotubes and Graphene.
In: Nano Letters, pp. 1589-1594, 10, (5), ISSN 1530-6984, [Online-Edition: http://dx.doi.org/10.1021/nl9039795],
[Article]

Abstract

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 π* 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 1.6 ± 0.2 eV could indicate radiative decay under emission or absorption of optical phonons, respectively.

Item Type: Article
Erschienen: 2010
Creators: Essig, S. and Marquardt, C. W. and Vijayaraghavan, A. and Ganzhorn, M. and Dehm, S. and Hennrich, F. and Ou, F. and Green, A. A. and Sciascia, C. and Bonaccorso, F. and Bohnen, K.-P. and Löhneysen, H. v. and Kappes, M. M. and Ajayan, P. M. and Hersam, M. C. and Ferrari, A. C. and Krupke, R.
Title: Phonon-Assisted Electroluminescence from Metallic Carbon Nanotubes and Graphene
Language: English
Abstract:

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 π* 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 1.6 ± 0.2 eV could indicate radiative decay under emission or absorption of optical phonons, respectively.

Journal or Publication Title: Nano Letters
Volume: 10
Number: 5
Uncontrolled Keywords: Carbon nanotubes; graphene; electroluminescence; phonons
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Nov 2011 11:48
Official URL: http://dx.doi.org/10.1021/nl9039795
Identification Number: doi:10.1021/nl9039795
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