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Title: Lifetime and linewidth of individual quantum dots interfaced with graphene

Here, we report on luminescence lifetimes and linewidths from an array of individual quantum dots (QDs) that were either interfaced with graphene surface guides or dispersed on aluminum electrodes. The observed fluorescence quenching is consistent with screening by charge carriers. Fluorescence quenching is typically mentioned as a sign that chromophores are interfacing with a conductive surface (metal or graphene); we find that the QDs interfaced with the metal film exhibit shortened lifetime and line-broadening but not necessarily fluorescence quenching as the latter may be impacted by molecular concentration, reflectivity and conductor imperfections. We also comment on angle-dependent lifetime measurements, which we postulate depend on the specifics of the local density-of-states involved.
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [1]
  1. New Jersey Institute of Technology (NJIT), Newark, NJ (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 10; Journal Issue: 15; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Argonne National Laboratory, Center for Nanoscale Materials; USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY
OSTI Identifier:
1461497

Miao, Xin, Gosztola, David J., Sumant, Anirudha V., and Grebel, Haim. Lifetime and linewidth of individual quantum dots interfaced with graphene. United States: N. p., Web. doi:10.1039/c8nr01769g.
Miao, Xin, Gosztola, David J., Sumant, Anirudha V., & Grebel, Haim. Lifetime and linewidth of individual quantum dots interfaced with graphene. United States. doi:10.1039/c8nr01769g.
Miao, Xin, Gosztola, David J., Sumant, Anirudha V., and Grebel, Haim. 2018. "Lifetime and linewidth of individual quantum dots interfaced with graphene". United States. doi:10.1039/c8nr01769g.
@article{osti_1461497,
title = {Lifetime and linewidth of individual quantum dots interfaced with graphene},
author = {Miao, Xin and Gosztola, David J. and Sumant, Anirudha V. and Grebel, Haim},
abstractNote = {Here, we report on luminescence lifetimes and linewidths from an array of individual quantum dots (QDs) that were either interfaced with graphene surface guides or dispersed on aluminum electrodes. The observed fluorescence quenching is consistent with screening by charge carriers. Fluorescence quenching is typically mentioned as a sign that chromophores are interfacing with a conductive surface (metal or graphene); we find that the QDs interfaced with the metal film exhibit shortened lifetime and line-broadening but not necessarily fluorescence quenching as the latter may be impacted by molecular concentration, reflectivity and conductor imperfections. We also comment on angle-dependent lifetime measurements, which we postulate depend on the specifics of the local density-of-states involved.},
doi = {10.1039/c8nr01769g},
journal = {Nanoscale},
number = 15,
volume = 10,
place = {United States},
year = {2018},
month = {3}
}

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