Figure 5

Photoluminescence spectra of CQD with and without nitrogen doping measured using excitation wavelengths in the range of 300 to 500 nm, (a) g-CQDs (without nitrogen doping); (b) N-0.25; (c) N-2.5, (d) N-10.

Photoluminescence spectra of CQD with and without nitrogen doping measured using excitation wavelengths in the range of 300 to 500 nm, (a) g-CQDs (without nitrogen doping); (b) N-0.25; (c) N-2.5, (d) N-10.