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. 2019 Feb 27;9(3):209–216. doi: 10.1016/j.jpha.2019.02.003

Fig. 4.

Fig. 4

(A) The integral overlap region (i), the riboflavin absorption (ii) and the CDs emission (iii) spectra. (B) Fluorescence spectra of CDs in the presence of different amounts of riboflavin, λex = 380 nm. (C) The efficiency of the FRET process as a function of the riboflavin concentration with the excitation wavelength of the CDs/riboflavin varying from 340 to 400 nm.