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

Abstract

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:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Argonne National Laboratory, Center for Nanoscale Materials; USDOE Office of Science (SC)
OSTI Identifier:
1461497
Alternate Identifier(s):
OSTI ID: 1434133
Grant/Contract Number:  
AC02-06CH11357
Resource 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
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

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., 2018. 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. Mon . "Lifetime and linewidth of individual quantum dots interfaced with graphene". United States. doi:10.1039/c8nr01769g. https://www.osti.gov/servlets/purl/1461497.
@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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: (a) Schematics of the graphene covered configuration. (b) SEM image of a QD-filled hole array in anodized aluminum oxide (the black dots within the pores, some are marked by blue circles). Occasionally one may find QDs, marked by a yellow circle, between the holes. (c) Top view ofmore » the sample: the metal electrode, used for anodization, is situated right next to the AAO region. The graphene was covering a part of the QD embedded AAO region. The sample was rotated as shown and the incident polarization was p-pol. with respect to the sample axis.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.