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

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/c8nr01769g· OSTI ID:1461497
 [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)

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Argonne National Laboratory, Center for Nanoscale Materials; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1461497
Alternate ID(s):
OSTI ID: 1434133
Journal Information:
Nanoscale, Vol. 10, Issue 15; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Cited By (1)


Figures / Tables (6)