title: Luminescence decay and the absorption cross section of individual single-walled carbon nanotubes.
abstract: 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 approximately 1 x 10(-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.
authors.affiliation: Centre de Physique Moléculaire Optique et Hertzienne, Université de Bordeaux and CNRS, 351 cours de la Libération, Talence, F-33405, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Berciaud
authors.forename: Laurent
authors.initials: L
authors.lastname: Cognet
authors.forename: Brahim
authors.initials: B
authors.lastname: Lounis