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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