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Direct observation of deep excitonic states in the photoluminescence spectra of single-walled carbon nanotubes

Kiowski, Oliver and Arnold, Katharina and Lebedkin, Sergei and Hennrich, Frank and Kappes, Manfred M. (2007) Direct observation of deep excitonic states in the photoluminescence spectra of single-walled carbon nanotubes. PHYSICAL REVIEW LETTERS, 99 (23).

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Official URL: http://link.aps.org/abstract/PRL/v99/e237402

Abstract

Low-energy, dark excitonic states have recently been predicted to lie below the first bright (E-11) exciton in semiconducting single-walled carbon nanotubes [Phys. Rev. Lett. 93, 157402 (2004)]. Decay into such deep excitonic states is implicated as a mechanism which reduces photoluminescence quantum yields. In this study we report the first direct observation of deep excitons in SWNTs. Photoluminescence (PL) microscopy of suspended semiconducting single-walled carbon nanotubes (SWNTs) reveals weak emission satellites redshifted by similar to 38-45 and similar to 100-130 meV relative to the main E-11 PL emission peaks. Similar satellites, redshifted by 95-145 meV depending on nanotube species, were also found in PL measurements of ensembles of SWNTs in water-surfactant dispersions. The relative intensities of these deep exciton emission features depend on the nanotube surroundings.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Photonics
ID Code:255
Deposited By:Lesley Tobin
Deposited On:26 Nov 2008 16:31
Last Modified:09 Feb 2009 15:24

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