Organic light-emitting materials may have an impact on the human body or the environment. In addition, they also have the disadvantages of high production cost, easy quenching of lighting, and difficult control of lighting intensity and color. Therefore, it is of great significance to explore rare earth luminescent materials with superior properties and find their application value. The rare earth ion Er3+, Eu3+ co-doped LaOF phosphors were prepared by the hydrothermal-assisted solid-phase method. The phase composition, particle size, morphology and fluorescence spectrum of LaOF∶Eu3+ phosphors doped with Er3+ at different concentrations were characterized and analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM) and fluorescence analyzer. The results show that the precursor LaF3 of phosphors is well transformed into tetragonal LaOF after calcining at 900 ℃, and with the increase of Er3+ doped concentration, the luminescent properties of the phosphors show a good rule at the excitation wavelengths of 365 nm and 393 nm. Among them, the excitation at 365 nm shows the transition from orange light to yellow light, while the excitation at 393 nm shows the transition from orange light to magenta light. Finally, Er3+, Eu3+ co-doped LaOF phosphor is made into ink and printed into patterns, and when it is excited at 365 nm and 395 nm, the orange and purple emission is visible, respectively, which shows that they can be used in the field of anti-counterfeiting.