Fig. 3
a PL spectra of NCDs treated with different concentration of NaBH4 ranging from 0 to 0.04 g/mL, λex = 400 nm. b Digital photographs of NCDs treated with 0, 0.01, and 0.04 g/mL NaBH4 under an UV lamp. Deconvoluted PL spectra of NCDs treated with c 0.005 and d 0.04 g/mL NaBH4 separately with two emission bands of peak 1 and peak 2. e UV-vis absorption spectra of NCDs treated with 0 and 0.04 g/mL NaBH4. f The schematic illustration of the proposed emission process in the original and reduced NCDs