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. 2018 Oct 17;8(10):844. doi: 10.3390/nano8100844

Figure 4.

Figure 4

Optical characterizations of GQDs-1. (a) Combined UV-Vis absorption (black line), PLE spectrum with detection wavelength of 445 nm (red line) and PL spectrum excited at 325 nm (blue line) of the GQDs-1 dispersed in water. Inset of panel (a): the left is a photograph of the corresponding GQDs-1 aqueous solution under UV light with 365 nm excitation; the right is a photograph of the corresponding GQDs-1 aqueous solution taken under visible light. (b) PL spectra of the GQDs-1 solution under different excitation wavelengths.