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Coupling between Emissive Defects on Carbon Nanotubes: Modeling Insights

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [4];  [4];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Rochester, NY (United States); North Dakota State Univ., Fargo, ND (United States); North Dakota State University
  2. Army Research Lab., Adelphi, MD (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. North Dakota State Univ., Fargo, ND (United States)

Covalent functionalization of single-walled carbon nanotubes (SWCNTs) with organic molecules results in red-shifted emissive states associated with sp3-defects in the tube lattice, which facilitate their improved optical functionality, including single-photon emission. The energy of the defect-based electronic excitations (excitons) depends on the molecular adducts, the configuration of the defect, and concentration of defects. In this work, we model the interactions between two sp3-defects placed at various distances in the (6,5) SWCNT using time-dependent density functional theory. Calculations reveal that these interactions conform to the effective model of J-aggregates for well-spaced defects (>2 nm), leading to a red-shifted and optically allowed (bright) lowest energy exciton. H-aggregate behavior is not observed for any defect orientations, which is beneficial for emission. The splitting between the lowest energy bright and optically forbidden (dark) excitons and the pristine excitonic band are controlled by the single-defect configurations and their axial separation. These findings enable a synthetic design strategy for SWCNTs with tunable near-infrared emission.

Research Organization:
North Dakota State Univ., Fargo, ND (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0021287; AC02-05CH11231
OSTI ID:
1839862
Alternate ID(s):
OSTI ID: 2483989
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 32 Vol. 12; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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