期刊
NANO LETTERS
卷 16, 期 4, 页码 2328-2333出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b05012
关键词
Energy transfer; quantum dots; graphene; MoS2; transition metal dichalcogenides; dielectric screening
类别
资金
- National Science Foundation MRSEC program through the Center for Precision Assembly of Superstratic and Superatomic Solids [DMR-1420634]
- W. M. Keck Foundation
- Air Force Office of Scientific Research [FA9550-14-1-0268]
- AMOS program, Chemical Sciences, Geosciences, and Biosciences Division, Basic Energy Sciences, Office of Science, US Department of Energy [DE-AC02-76-SFO0515]
We report efficient nonradiative energy transfer (NRET) from core shell, semiconducting quantum dots to adjacent two-dimensional sheets of graphene and MoS2 of single- and few-layer thickness. We observe quenching of the photoluminescence (PL) from individual quantum dots and enhanced PL decay rates in time-resolved PL, corresponding to energy transfer rates of 1-10 ns(-1). Our measurements reveal contrasting trends in the NRET rate from the quantum dot to the van der Waals material as a function of thickness. The rate increases significantly with increasing layer thickness of graphene, but decreases with increasing thickness of MoS2 layers. A classical electromagnetic theory accounts for both the trends and absolute rates observed for the NRET. The countervailing trends arise from the competition between screening and absorption of the electric field of the quantum dot dipole inside the acceptor layers. We extend our analysis to predict the type of NRET behavior for the near-field coupling of a chromophore to a range of semiconducting and metallic thin film materials.
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