BaAl₂Si₂O₈:Cr³⁺, Er³⁺ series phosphors were synthesized by high-temperature solid-phase method. The effects of Cr³⁺ and Er³⁺ doping on the light-emitting properties of BaAl₂Si₂O₈ materials were studied. The BaAl₂Si₂O₈:Er³⁺ fluorescence sample exhibited only green fluorescence with a peak value of 550 nm at an excitation wavelength of 393 nm, which is derived from the superposition of ²H_11/2→⁴I_15/2 and ⁴S_3/2→⁴I_15/2 transitions. The BaAl₂Si₂O₈:Cr³⁺ fluorescence sample exhibits red fluorescence with a peak value of 694 nm at an excitation wavelength of 550 nm, which is derived from the ²E→⁴A₂ transition. In the co-doped samples BaAl₂Si₂O₈:Cr³⁺, Er³⁺, 380 nm is used as the excitation light at the groove of the Cr³⁺ excitation peak, and the obtained emission peaks include not only the emission peak position of Er³⁺, but also the emission peak position of Cr³⁺, which indicates that there may be radiant energy transfer between them; the fluorescence spectra of the co-doped BaAl₂Si₂O₈:1% Cr³⁺, x% Er³⁺ samples were tested. With the increase of x, the intensity of the excitation and emission spectra of Cr³⁺ increased, and when x=0.5, the spectral intensity is 4 times the original. In addition, when the concentration of Cr³⁺ is fixed, the fluorescence lifetime of Cr³⁺ gradually increases as the concentration of Er³⁺ increases; when the concentration of Er³⁺ is fixed, the fluorescence lifetime of Er³⁺ decreases gradually as the concentration of Cr³⁺ increases. These phenomena indicate the existence of resonance energy transfer between Er³⁺ and Cr³⁺. The critical energy distance between Er³⁺ and Cr³⁺ is 4.5 nm, which is an electric dipole-dipole (d-d) interaction.