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Exciton decay dynamics in individual carbon nanotubes at room temperature
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Confocal PL image of SWNT on glass using a detection range of (scalebar ). The excitation density was . (b) PL spectrum detected for one of the nanotubes in (a). Based on the emission energy of the nanotube chirality is identified as (6,4) (Ref. 16). (c) Semilogarithmic plot of the PL transient (solid line) detected for the (6,4) nanotube observed in (b) together with the independently recorded instrument response function (IRF, dotted line). A single-exponential fit function (dashed line) convoluted with the IRF describes the transient over four orders of magnitude clearly showing monoexponential decay dynamics with a lifetime . The quality of the fit can be seen from the residuum of measured transient and single-exponential fit in (d). Note. the second slope results from the IRF and is observed for all measured transients.

Image of FIG. 2.
FIG. 2.

(a) PL transients recorded for three different single (6,4) SWNT. Excited state decay times were obtained from monoexponential fits to the experimental data (solid lines) taking into account the measured instrument response. (b) Histogram of exciton decay times observed for 126 different (6,4) nanotubes. The distribution is centered at with an average lifetime of and a width of .

Image of FIG. 3.
FIG. 3.

(a) Decay times determined for two different (6,4) SWNT for increasing pump fluences. (b) Correlation between spectral width of detected (6,4) nanotube spectra and lifetimes. Slow decay is observed for narrow linewidth.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Exciton decay dynamics in individual carbon nanotubes at room temperature