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. 2016 Jan 13;6:19159. doi: 10.1038/srep19159

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Copyright © 2016, Macmillan Publishers Limited

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(a) WS₂ synthesized using recipe C repeatedly results in the highest intensity PL emission. The Raman peaks from WS₂ and the Si substrate are also measureable (inset). The large PL/Raman ratio demonstrates the high luminescent efficiency. Values for (b) PL intensity, (c) full width at half maximum, and (d) PL peak position are shown for multiple randomly selected monolayer locations on a given sample. (e–g) The corresponding Raman spectra are displayed. The E¹_2g and A_1g Raman peaks are observed at 357.5 cm⁻¹ and 419 cm⁻¹ for all WS₂, as indicated by dashed vertical lines.