Figure 1.

UV–Vis absorption spectra and fluorescence spectra of three kinds of GQDs. (a) The UV–Vis absorption spectra of three kinds of GQDs. (b) The fluorescence spectra of aGQDs excited from 320 to 580 nm. (c) The fluorescence spectra of cGQDs independent on the excitation wavelength. (d) The fluorescence spectra of dGQDs.

Yuan et al. Nanoscale Research Letters 2014 9:108   doi:10.1186/1556-276X-9-108
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