Length-dependent photoluminescence lifetimes in single-walled carbon nanotubes

Yuhei Miyauchi, Kazunari Matsuda, Yuki Yamamoto, Naotoshi Nakashima, Yoshihiko Kanemitsu

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28 Citations (Scopus)

Abstract

We describe the length-dependent exciton dynamics in DNA-wrapped single-walled carbon nanotubes (SWNTs) using time-resolved photoluminescence (PL) excitation correlation spectroscopy. We demonstrate that the effective PL lifetimes have substantial upper limits in longer SWNTs. Our results suggest that the exciton diffusion to the ends of the nanotube has only a limited contribution to the net nonradiative relaxation rate, and the nonradiative processes that occur before the excitons reach the ends of SWNT are the dominant contribution to the nonradiative lifetime. From the length-dependent PL lifetimes and relative intensities in DNA-wrapped SWNTs, the exciton diffusion length was found to be ∼50 nm, and the diffusion coefficient was ∼1 cm2/s.

Original languageEnglish
Pages (from-to)12905-12908
Number of pages4
JournalJournal of Physical Chemistry C
Volume114
Issue number30
DOIs
Publication statusPublished - Aug 5 2010

All Science Journal Classification (ASJC) codes

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

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    Miyauchi, Y., Matsuda, K., Yamamoto, Y., Nakashima, N., & Kanemitsu, Y. (2010). Length-dependent photoluminescence lifetimes in single-walled carbon nanotubes. Journal of Physical Chemistry C, 114(30), 12905-12908. https://doi.org/10.1021/jp1027492