Luminescence Decay and the Absorption Cross-Section of Individual Single-Walled Carbon Nanotubes

Details Luminescence Decay and the Absorption Cross-Section of Individual Single-Walled Carbon Nanotubes Luminescence Decay and the Absorption Cross-Section of Individual Single-Walled Carbon Nanotubes

2009-01-06

arxiv.org/abs/0901.0728v1

Phys. Rev. Lett. 101, 077402 (2008)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.101.077402

The absorption cross section of highly luminescent individual single-walled carbon nanotubes is determined using time-resolved and cw luminescence spectroscopy. A mean value of 1x10-17 cm2 per carbon atom is obtained for (6,5) tubes excited at their second optical transition, and corroborated by single tube photothermal absorption measurements. Biexponential luminescence decays are systematically observed, with short and long lifetimes around 45 and 250 ps. This behavior is attributed to the band edge exciton fine structure with a dark level lying a few meV below a bright one.

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