Length-dependent photoluminescence lifetimes in single-walled carbon nanotubes

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

    Research output: Contribution to journalArticlepeer-review

    31 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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