Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes

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

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

We show that new low-energy photoluminescence (PL) bands can be created in the spectra of semiconducting single-walled carbon nanotubes by intense pulsed excitation. The new bands are attributed to PL from different nominally dark excitons that are "brightened" because of a defect-induced mixing of states with different parity and/or spin. Time-resolved PL studies on single nanotubes reveal a significant reduction of the bright exciton lifetime upon brightening of the dark excitons. The lowest-energy dark state has longer lifetimes and is not in thermal equilibrium with the bright state.

Original languageEnglish
Pages (from-to)2010-2014
Number of pages5
JournalNano letters
Volume9
Issue number5
DOIs
Publication statusPublished - May 13 2009

    Fingerprint

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this