DataVXACS NanoPaper
journal article·2019-11-26

Linearly Polarized Luminescence of Atomically Thin MoS2 Semiconductor Nanocrystals

Andrés Granados del Águila, Sheng Liu, T. Thu Ha Do, Zhuangchai Lai, Thu Ha Tran, Sean Ryan Krupp, Zhi-Rui Gong, Hua Zhang, Wang Yao, Qihua Xiong

ACS Nano· Volume 13· Issue 11
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Source abstract

Abstract

Atomically thin layers of transition-metal dichalcogenides semiconductors, such as MoS2, 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 MoS2 colloidal semiconductor nanocrystals. In addition to the spatial-confinement effect leading to their blue wavelength emission, the high quality of our MoS2 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 MoS2, 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.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371

Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore 639977

College of Physics and Energy, Shenzhen University, Shenzhen 518060, China

Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China

Department of Physics, University of Hong Kong, Hong Kong, China

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

Funding

Research Grants Council, University Grants Committee · Ministry of Education - Singapore · National Research Foundation Singapore · Innovation and Technology Commission · Croucher Foundation · City University of Hong Kong · National Natural Science Foundation of China · Nanyang Technological University

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