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. 2019 Nov 28;9:17781. doi: 10.1038/s41598-019-54406-5

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© The Author(s) 2019

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(a) PL spectrum as a function of temperature. (b) Multi-peak fitting of PL spectrum at 10 K. (c) Photoemission energy (blue squares and red circles) as a function of temperature. The dashed lines represent the fitting curve based on the empirical Varshni equation.