Extrinsic and intrinsic effects on the excited-state kinetics of single-walled carbon nanotubes

Marcus Jones, Wyatt K. Metzger, Timothy J. McDonald, Chaiwat Engtrakul, Randy J. Ellingson, Gary Rumbles, Michael J. Heben

Research output: Contribution to journalArticle

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Abstract

We characterized the photoluminescence (PL) decay of 15 different, solubilized single-walled carbon nanotubes with tube diameters that ranged from 0.7 to 1.1 nm using time-correlated single photon counting. Each anotube species was excited resonantly at the second excited state, E2, and PL was detected at the lowest energy exciton emission, E1. In a 10 ns window, the PL decays were described well by a biexponential fitting function with two characteristic time constants, suggesting that at least two kinetically distinct relaxation processes were observed. The dominant decay component increased from 60 to 200 ps with increasing tube diameter, while the lesser component, which contributed up to 8% of the total decay, increased from 200 ps to 4.8 ns. The observation of the second, longer decay time component is examined in terms of two possible models: an extrinsic behavior that implicates sample inhomogeneity and an intrinsic process associated with interconversion between kinetically distinct bright and dark exciton states. A common conclusion from both models is that nonradiative decay controls the PL decay by a process that is diameter dependent.

Original languageEnglish
Pages (from-to)300-306
Number of pages7
JournalNano Letters
Volume7
Issue number2
DOIs
Publication statusPublished - Feb 2007

Fingerprint

Single-walled carbon nanotubes (SWCN)
Excited states
Photoluminescence
carbon nanotubes
Kinetics
kinetics
decay
Excitons
excitation
photoluminescence
Relaxation processes
excitons
tubes
Photons
time constant
counting
inhomogeneity
photons
LDS 751

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Chemistry (miscellaneous)

Cite this

Jones, M., Metzger, W. K., McDonald, T. J., Engtrakul, C., Ellingson, R. J., Rumbles, G., & Heben, M. J. (2007). Extrinsic and intrinsic effects on the excited-state kinetics of single-walled carbon nanotubes. Nano Letters, 7(2), 300-306. https://doi.org/10.1021/nl0622808

Extrinsic and intrinsic effects on the excited-state kinetics of single-walled carbon nanotubes. / Jones, Marcus; Metzger, Wyatt K.; McDonald, Timothy J.; Engtrakul, Chaiwat; Ellingson, Randy J.; Rumbles, Gary; Heben, Michael J.

In: Nano Letters, Vol. 7, No. 2, 02.2007, p. 300-306.

Research output: Contribution to journalArticle

Jones, M, Metzger, WK, McDonald, TJ, Engtrakul, C, Ellingson, RJ, Rumbles, G & Heben, MJ 2007, 'Extrinsic and intrinsic effects on the excited-state kinetics of single-walled carbon nanotubes', Nano Letters, vol. 7, no. 2, pp. 300-306. https://doi.org/10.1021/nl0622808
Jones, Marcus ; Metzger, Wyatt K. ; McDonald, Timothy J. ; Engtrakul, Chaiwat ; Ellingson, Randy J. ; Rumbles, Gary ; Heben, Michael J. / Extrinsic and intrinsic effects on the excited-state kinetics of single-walled carbon nanotubes. In: Nano Letters. 2007 ; Vol. 7, No. 2. pp. 300-306.
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