Skip to main content
Article thumbnail
Location of Repository

Defect-Induced Photoluminescence from Dark Excitonic States in Individual Single-Walled Carbon Nanotubes

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

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.

Topics: Chemie und Pharmazie, ddc:540
Year: 2009
DOI identifier: 10.1021/nl9002798
OAI identifier: oai:epub.ub.uni-muenchen.de:14510
Provided by: Open Access LMU

Suggested articles

Citations

  1. (2006). Carbon Based Magnetism; Elsevier: doi
  2. (2008). Carbon Nanotubes; doi
  3. (2007). Science doi
  4. (2007). Today doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.