<p>A variety of Dy³⁺/Eu³⁺ co-doped Sr₉Gd₂W₄O₂₄ phosphors were synthesized via solid-phase method. Firstly, the samples' structure and composition were analyzed to confirm the synthesis of high-purity Sr₉Gd₂W₄O₂₄: Dy³⁺/Eu³⁺ phosphors. Secondly, the luminescence properties of the samples were characterized mainly by photoluminescence spectra, and the energy transfer from Dy³⁺ to Eu³⁺ was discussed. In Sr₉Gd_2-<i>x</i>W₄O₂₄: <i>x</i>Dy³⁺ phosphors, as the doping concentration of Dy³⁺ increases, the emission intensity of Dy³⁺ first increases and then decreases. The concentration quenching point of Dy³⁺ is 0.1. In Sr₉Gd_1.9-<i>y</i>W₄O₂₄: 0.1Dy³⁺/<i>y</i>Eu³⁺ phosphors, as the doping concentration of Eu³⁺ increases, the emission intensity of Dy³⁺ gradually decreases, while the emission intensity of Eu³⁺ gradually increases. The emission spectra and decay curve of Sr₉Gd_1.9-<i>y</i>W₄O₂₄: 0.1Dy³⁺/<i>y</i>Eu³⁺ phosphors indicate that there is energy transfer from Dy³⁺ to Eu³⁺, and as the Eu³⁺ doping concentration increases, the energy transfer efficiency from Dy³⁺ to Eu³⁺ increases. By altering the doping ratio of Dy³⁺/Eu³⁺, the emission intensity of Dy³⁺ and Eu³⁺ can be adjusted, thereby achieving the tunable luminescence properties of the phosphors. Finally, when the Sr₉Gd_1.7W₄O₂₄: 0.1Dy³⁺/0.2Eu³⁺ phosphor combined with commercial LED chips, warm white light emission can be obtained. The findings imply that the prepared phosphors provide a viable option for color conversion materials in solid-state lighting applications.</p>