Low-lying exciton states determine the photophysics of semiconducting single wall carbon nanotubes

Gregory D. Scholes, Sergei Tretiak, Timothy J. McDonald, Wyatt K. Metzger, Chaiwat Engtrakul, Garry Rumbles, Michael J. Heben

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

A combined experimental and theoretical study of the photophysical properties and excited-state dynamics of semiconducting single-wall carbon nanotubes (SWNTs) is reported. Steady-state and time-resolved fluorescence data as a function of temperature are explained on the basis of a manifold of four low-lying singlet exciton states with kinetically controlled interconversion. Relaxation among these levels is slow and therefore Kasha's rule is not obeyed. Quantum chemical calculations based on time-dependent density functional theory complement the experimental findings. The temperature-dependence of the radiative and nonradiative rate constants are examined.

Original languageEnglish
Pages (from-to)11139-11149
Number of pages11
JournalJournal of Physical Chemistry C
Volume111
Issue number30
DOIs
Publication statusPublished - Aug 2 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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