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Towards full-colour tunable photoluminescence of monolayer MoS2/carbon quantum dot ultra-thin films

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Abstract

Due to the limitations of excitonic energy and band structure, monolayer (1L) MoS2 can only emit a narrow band of red light. Herein, we bypassed this restriction by coating 1L-MoS2 with an ultra-thin layer of highly luminescent carbon quantum dots (CQDs). These novel 1L-MoS2/CQD ultra-thin films exhibit multiple emission bands, including red light bands belonging to MoS2 and tunable bands belonging to the CQDs. A balanced intensity of these bands can be obtained by optimizing the thickness of the CQDs to ∼10 nm. By varying the excitation wavelength, the emission band of these 1L-MoS2/CQD ultra-thin films can be modulated from 550–700 nm to 450–700 nm, resulting in tunable light emission from orange (CIE0.5149, 0.3766) to yellow-green (CIE0.3175, 0.4509). These tunable emission bands are much broader than those of 1L-MoS2. However, to date, this full-color tunable emission has not been observed in other 1L-MoS2/QD thin films prepared using graphene oxide quantum dots (GOQDs) or graphene quantum dots (GQDs).

Graphical abstract: Towards full-colour tunable photoluminescence of monolayer MoS2/carbon quantum dot ultra-thin films

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Publication details

The article was received on 24 Apr 2017, accepted on 25 May 2017 and first published on 30 May 2017


Article type: Paper
DOI: 10.1039/C7TC01773A
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Towards full-colour tunable photoluminescence of monolayer MoS2/carbon quantum dot ultra-thin films

    W. Su, Y. Wang, W. Wu, H. Qin, K. Song, X. Huang, L. Zhang and D. Chen, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC01773A

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