▎ 摘　　要

The development of multicolor tunable emission graphene quantum dots (GQDs) is important for their application in photoelectric devices and multicolor anticounterfeiting. Herein, we synthesize blue (B-GQDs), green (G-GQDs), and red GQDs (RGQDs) via a solvothermal reaction. The B-, G-, and R-GQDs exhibit and exceptional photostability. The relative quantum yields (QYs) for the B-, G-, and R-GQDs are 68, 62, and 27%, respectively. Structural characterization and theoretical calculations indicate that the quantum size effect adjusts the red shift of emission from BGQDs to G-GQDs, and the increased content of oxygen and C=N bonds are answerable for the red emission of R-GQDs. Then, we apply the prepared multicolor GQDs as a fluorescent ink for pattern printing and multicolor anticounterfeiting. Moreover, B-, G-, and R-colors and white light-emitting diodes (LEDs) are fabricated by ultraviolet radiation as excitation. The white LEDs exhibit a color coordinate of (0.335, 0.343), a high color rendering index of 95, and a correlated color temperature of 4835 K. This research successfully expands the potential application of GQDs in the reliable anticounterfeiting, information security, and high color rendering index GQD-based LEDs.