▎ 摘　　要

In this paper, the photoluminescence (PL) behavior of reduced graphene quantum dots (rGQDs) was investigated. The rGQDs with different reduced level were obtained by after-reduced electrochemical prepared GQDs using sodium borohydride solution (NaBH4) as reductant. The reduced degree, surface oxygen functional groups, surface defect changes and band gap were detailed investigated through Transmission electron microscopy (TEM), high resolution TEM (HRTEM), Atomic force microscopy (AFM), Ultraviolet-visible spectroscopy (UV-Vis), Photoluminescence excitation (PLE), Fourier transform infrared spectroscopy (FT-IR), Raman spectrum, zeta potential analysis and X-ray photo-electron spectroscopy (XPS). The rGQDs showed higher PL emission and improved quantum yields than GQDs. But as the degree of reduction increased, PL emission decreased. Based on these result, we proposed that the PL change result from the surface hybridization state of GQDs. Our work could help to further understanding of PL behavior and mechanism of GQDs.