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Exciton Localization of Single-Walled Carbon Nanotubes Revealed by Femtosecond Excitation Correlation Spectroscopy

2006; American Physical Society; Volume: 97; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.97.257401

1092-0145

Hideki Hirori, Kazunari Matsuda, Yuhei Miyauchi, Shigeo Maruyama, Yoshihiko Kanemitsu,

Fullerene Chemistry and Applications

Photoluminescence (PL) dynamics in single-walled carbon nanotubes (SWNTs) has been studied by the femtosecond excitation correlation method with a 150 fs time resolution. The SWNT samples were synthesized by different methods and suspended in gelatin films or D2O solutions. The PL dynamics of SWNTs depends on the local environment surrounding the SWNTs rather than the synthesis methods. The very weak temperature dependence of tauPL and the environment-dependent tauPL reveal that the PL relaxation process is dominated by the interplay between free excitons and weakly localized excitons.