NaYF4:Yb, Er with N-GQDs mixture: One-pot hydrothermal synthesis and its luminescent film

Abstract NaYF4:Yb, Er with nitrogen-doped graphene quantum dots (N-GQDs) mixture was synthesized by a simple one-pot hydrothermal method. The as-obtained mixture shows green color under the irradiation of infrared light (980 nm), and exhibits blue color by means of ultraviolet excitation (365 nm). The luminescence of NaYF4:Yb, Er and N-GQDs are not affected by each other. And the synthesized mixture directly incorporated into a polyvinyl alcohol (PVA) matrix can obtain a transparent luminescent film. The luminescent film also shows different luminescent colors under different light irradiation (980 nm or 365 nm). This result indicates that it has a potential application value in anti-counterfeiting packaging.