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Tytuł:
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Linearly Polarized Luminescence of Atomically Thin MoS 2 Semiconductor Nanocrystals.
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Autorzy:
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Granados Del Águila A; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371.
Liu S; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371.
Do TTH; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371.
Lai Z; Center for Programmable Materials, School of Materials Science and Engineering , Nanyang Technological University , Singapore , Singapore 639977.
Tran TH; Center for Programmable Materials, School of Materials Science and Engineering , Nanyang Technological University , Singapore , Singapore 639977.
Krupp SR; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371.
Gong ZR; College of Physics and Energy , Shenzhen University , Shenzhen 518060 , China.
Zhang H; Center for Programmable Materials, School of Materials Science and Engineering , Nanyang Technological University , Singapore , Singapore 639977.; Department of Chemistry , City University of Hong Kong , Kowloon , Hong Kong , China.
Yao W; Department of Physics , University of Hong Kong , Hong Kong , China.
Xiong Q; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371.; MajuLab , CNRS-UNS-NUS-NTU International Joint Research Unit , UMI 3654 , Singapore 639798.; NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering , Nanyang Technological University, Singapore 639798.
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Źródło:
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ACS nano [ACS Nano] 2019 Nov 26; Vol. 13 (11), pp. 13006-13014. Date of Electronic Publication: 2019 Oct 14.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Washington D.C. : American Chemical Society
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Contributed Indexing:
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Keywords: TMD nanocrystals; atomically thin colloidal semiconductors; electron−hole exchange interaction; in-plane confinement; optical alignment; spin−orbit coupling; valley pseudospin
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Entry Date(s):
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Date Created: 20191003 Latest Revision: 20200304
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Update Code:
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20240104
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DOI:
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10.1021/acsnano.9b05656
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PMID:
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31577129
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Atomically thin layers of transition-metal dichalcogenides semiconductors, such as MoS 2 , exhibit strong and circularly polarized light emission due to inherent crystal symmetries, pronounced spin-orbit coupling, and out-of-plane dielectric and spatial confinement. While the layer-by-layer confinement is well-understood, the understanding of the impact of in-plane quantization in their optical spectrum is far behind. Here, we report the optical properties of atomically thin MoS 2 colloidal semiconductor nanocrystals. In addition to the spatial-confinement effect leading to their blue wavelength emission, the high quality of our MoS 2 nanocrystals is revealed by narrow photoluminescence, which allows us to resolve multiple optically active transitions, originating from quantum-confined excitons (coupled electron-hole pairs). Surprisingly, in stark contrast to monolayer MoS 2 , the luminescence of the lowest-energy levels is linearly polarized and persists up to room temperature , meaning that it could be exploited in a variety of light-emitting applications.
