Invited Presentation: Photoluminescence Imaging Probes of Contrasting 1-D and 0-D Exciton Behavior in Doped Carbon Nanotubes

Tuesday, May 13, 2014: 11:20
Bonnet Creek Ballroom XII, Lobby Level (Hilton Orlando Bonnet Creek)
S. K. Doorn, H. Yamaguchi, S. Yalcin, X. Ma, and H. Htoon (Los Alamos National Laboratory)
Introduction of new photoluminescent (PL) states upon low-level covalent doping of carbon nanotubes1,2 is gaining interest due to their chemical stability and potential for tube brightening.  The nature of these optical states is not yet well-understood.  We present PL imaging and spectroscopic studies of oxygen-doped tubes1 at the single-tube and single-dopant site levels.  Dynamic and static emission behaviors will be presented as modulated by the relative dopant concentration.  Results will be discussed as the interplay of 1-D bright exciton behaviors and 0-D trap states introduced at the dopant sites.

1.  S. Ghosh, et al., Science, 330, 1656 (2010).

2.  Y. Piao, et al., Nature Chem., 5, 840 (2013).