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. 2019 Apr 12;10:1709. doi: 10.1038/s41467-019-09781-y

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Emission spectra and tunability at T = 5 K. Pulsed EL from a WSe₂ and b WS₂. In WSe₂, a narrow emission (linewidth ∼2.8 meV FWHM) is found for both the charged biexciton and the dark exciton. Colormap of EL spectra at 5 K plotted as function of pulse offset V₀ in c WSe₂ and d WS₂ (V_p = 7.5 V). Colormap of charged doping control of PL emission in e WSe₂ and f WS₂, for different exciton species acquired at an excitation of P_d = 5 × 10³ Wcm⁻²