Skip to main content
. 2018 Jan 31;19(1):76–100. doi: 10.1080/14686996.2017.1422224

Figure 3.

Figure 3.

Changes in the optical properties of GQDs-based on size and surface state. (a) UV–vis spectra of GQDs A, B, and C, correspond to synthesis reaction temperatures of 120, 100, and 80 °C, respectively. (b) PL spectra of GQDs with different emission color. Reproduced with permission from [47]. Copyright 2012, American Chemical Society. (c) Size-dependent PL spectra excited at 325 nm for 5–35 nm GQDs in deionized (DI) water. Inset: different colors of luminescence from GQDs depending on their average size for three typical GQDs of 12, 17, and 22 nm. Reproduced with permission from [56]. Copyright 2012, American Chemical Society. (d) Bandgap changes for GQDs, m-GQDs, and r-GQDs. Reproduced with permission from [59]. Copyright 2012, Wiley-VCH. (e) Normalized PL (black lines) and PL excitation (red lines) spectra from aqueous amino-functionalized GQDs (afGQDs) solutions prepared under different conditions. (f) PL image of an aqueous afGQDs solution under excitation from a blue light-emitting diode (LED) (410 nm). Reproduced with permission from [57]. Copyright 2015, Royal Society of Chemistry.