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. 2017 Mar 23;7:322. doi: 10.1038/s41598-017-00068-0

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© The Author(s) 2017

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(a) PL spectra of WS₂/hBN measured with excitation power ranging from 0.37 to 6.6 μJ/cm² at 80 K. (b,c) Plots of PL intensities of trion, P₁ and P₂ verses that of exciton. Green, blue and red filled squares correspond to PL intensities of P₁, trion and P₂, respectively. Solid lines corresponds to fitted lines based on the relation of I ∞ I _ex ^α.