Analysis of photoluminescence from solubilized single-walled carbon nanotubes

Marcus Jones, Chaiwat Engtrakul, Wyatt K. Metzger, Randy J. Ellingson, Arthur J. Nozik, Michael J. Heben, Garry Rumbles

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Abstract

The functional form of the photoluminescence (PL) line shape from individual single-walled carbon nanotube (SWNT) species is found to contain a significant Lorentzian component and the Stokes shift is observed to be very small (<8 meV), which suggests an excitonic dephasing mechanism that is largely decoupled from surrounding solvent and surfactant molecules. The PL quantum yield (PLQY) of two SWNT species is determined to be ∼5×10 -4, and it is suggested that this is lower than the "true" value due to quenching of the PL in bundles by metallic tubes. Time-resolved PL measurements reveal a dominant, luminescence lifetime component of 130 ps that, when combined with a predicted natural radiative lifetime of ∼20 ns, suggests that the true PLQY is ∼6.5×10 -3. Finally, deconvoluted PL excitation spectra are produced for eight SWNT species, and the appearance of a higher-energy excitonic subband is discussed.

Original languageEnglish
Article number115426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number11
DOIs
Publication statusPublished - Mar 15 2005

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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