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Title: Defects Enable Dark Exciton Photoluminescence in Single-Walled Carbon Nanotubes

Abstract

Variable temperature photoluminescence excitation spectroscopy of three (n,m) species of single-walled carbon nanotubes revealed that at resonant S22 excitation, in addition to allowed excitonic optical transitions, several sidebands that should be forbidden based on selection rules were observed and appeared to have a strong temperature dependence. In particular, we found that a sideband located approximately 130 meV away from the bright S11 exciton peak relating to the K-momentum dark exciton state, called X1, decreased in intensity five-fold as the samples were cooled. Direct optical excitation of this dark state is nominally forbidden, thus calling into question how the state is populated, and why it is so prominent in the photoluminescence spectrum. Interestingly, the ratio of the integrated photoluminescence intensities of X1 to S11 scales with a Boltzmann factor unrelated to the phonon that is thought to be responsible for depopulating the K-momentum dark exciton state: an in-plane transverse optical phonon, A1’. Furthermore, photoluminescence spectra from individual (7,5) nanotubes show that only a small fraction exhibit the X1 feature, with varying oscillator strength, thus suggesting that intrinsic processes such as phonon scattering are not responsible for populating the dark state. Alternatively, we suggest that populating the K-momentum dark exciton state requiresmore » scattering from defects, which is consistent with the increased magnitude of the X1 feature for samples with increased sample purification and processing. Thus, the presence of an X1 peak in photoluminescence is an extremely sensitive spectroscopic indicator of defects on single-walled carbon nanotubes.« less

Authors:
 [1];  [2];  [2];  [1]
  1. Univ. of Rochester, NY (United States)
  2. Rochester Inst. of Technology, Rochester, NY (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1417973
Grant/Contract Number:  
FG02-06ER15821
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 122; Journal Issue: 6; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Amori, Amanda R., Rossi, Jamie E., Landi, Brian J., and Krauss, Todd D. Defects Enable Dark Exciton Photoluminescence in Single-Walled Carbon Nanotubes. United States: N. p., 2018. Web. doi:10.1021/acs.jpcc.7b10565.
Amori, Amanda R., Rossi, Jamie E., Landi, Brian J., & Krauss, Todd D. Defects Enable Dark Exciton Photoluminescence in Single-Walled Carbon Nanotubes. United States. https://doi.org/10.1021/acs.jpcc.7b10565
Amori, Amanda R., Rossi, Jamie E., Landi, Brian J., and Krauss, Todd D. Wed . "Defects Enable Dark Exciton Photoluminescence in Single-Walled Carbon Nanotubes". United States. https://doi.org/10.1021/acs.jpcc.7b10565. https://www.osti.gov/servlets/purl/1417973.
@article{osti_1417973,
title = {Defects Enable Dark Exciton Photoluminescence in Single-Walled Carbon Nanotubes},
author = {Amori, Amanda R. and Rossi, Jamie E. and Landi, Brian J. and Krauss, Todd D.},
abstractNote = {Variable temperature photoluminescence excitation spectroscopy of three (n,m) species of single-walled carbon nanotubes revealed that at resonant S22 excitation, in addition to allowed excitonic optical transitions, several sidebands that should be forbidden based on selection rules were observed and appeared to have a strong temperature dependence. In particular, we found that a sideband located approximately 130 meV away from the bright S11 exciton peak relating to the K-momentum dark exciton state, called X1, decreased in intensity five-fold as the samples were cooled. Direct optical excitation of this dark state is nominally forbidden, thus calling into question how the state is populated, and why it is so prominent in the photoluminescence spectrum. Interestingly, the ratio of the integrated photoluminescence intensities of X1 to S11 scales with a Boltzmann factor unrelated to the phonon that is thought to be responsible for depopulating the K-momentum dark exciton state: an in-plane transverse optical phonon, A1’. Furthermore, photoluminescence spectra from individual (7,5) nanotubes show that only a small fraction exhibit the X1 feature, with varying oscillator strength, thus suggesting that intrinsic processes such as phonon scattering are not responsible for populating the dark state. Alternatively, we suggest that populating the K-momentum dark exciton state requires scattering from defects, which is consistent with the increased magnitude of the X1 feature for samples with increased sample purification and processing. Thus, the presence of an X1 peak in photoluminescence is an extremely sensitive spectroscopic indicator of defects on single-walled carbon nanotubes.},
doi = {10.1021/acs.jpcc.7b10565},
journal = {Journal of Physical Chemistry. C},
number = 6,
volume = 122,
place = {United States},
year = {2018},
month = {1}
}

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Works referencing / citing this record:

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