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

68 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

Single-walled carbon nanotubes (SWCN)
Excitons
Photoluminescence
carbon nanotubes
excitons
photoluminescence
Defects
defects
life (durability)
dark energy
Nanotubes
nanotubes
parity
excitation
LDS 751
energy

ASJC Scopus subject areas

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

Cite this

Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes. / Harutyunyan, Hayk; Gokus, Tobias; Green, Alexander A.; Hersam, Mark C; Allegrini, Maria; Hartschuh, Achim.

In: Nano Letters, Vol. 9, No. 5, 13.05.2009, p. 2010-2014.

Research output: Contribution to journalArticle

Harutyunyan, Hayk ; Gokus, Tobias ; Green, Alexander A. ; Hersam, Mark C ; Allegrini, Maria ; Hartschuh, Achim. / Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes. In: Nano Letters. 2009 ; Vol. 9, No. 5. pp. 2010-2014.
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