Photoluminescence from disorder induced states in individual single-walled carbon nanotubes

Hayk Harutyunyan, Tobias Gokus, Alexander Green, Mark C. Hersam, Maria Allegrini, Achim Hartschuh

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We report on the generation of new low-energy photoluminescence (PL) bands in the spectra of semiconducting single-walled carbon nanotubes (SWNTs). The new bands, that are brightened because of local modifications of the nanotube structure or the metal adsorption on the SWNT surface, are attributed to PL from different nominally dark excitons that are "brightened" due to defect-induced mixing of states with different parity and/or spin. The effect of the created structural disorder on the dynamical properties of the emission is studied by time-resolved PL measurements revealing a significant reduction of the bright exciton lifetime. The lowest energy dark state has a longer lifetime and is not in thermal equilibrium with the bright state.

Original languageEnglish (US)
Pages (from-to)2679-2682
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume246
Issue number11-12
DOIs
StatePublished - Dec 2009
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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