In order to improve the red luminescent properties, Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺ was selected as a blue persistent luminescent donor phosphor, while light conversion agent was utilized to tune the persistent luminescent spectra from blue to red. Composite red luminescent material Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺/light conversion agent (SMED/LCA) was fabricated with light conversion agent and Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺ at a certain mass ratio. SiO₂ (Al₂O₃ or MgF₂) were coated on the surface of SMED/LCA through heterogeneous deposition method. The structural and optical characteristics of the resulting samples were launched in terms of X-ray diffraction and emission spectrum as well as afterglow brightness. The results demonstrate that the emission spectrum exhibits two emission bands, and the peaks are located at around 470 and 615 nm. SiO₂, Al₂O₃ and MgF₂ are coated on the surface of SMED/LCA like a protective shell to maintain its stability and luminescent properties, the afterglow initial brightness is still up to 0.37 cd/m² and the afterglow color purity calculated from CIE color coordinates is basically unchanged.

为了提高红色发光性能，选择Sr ₂ MgSi ₂ O ₇ :Eu ²⁺ ,Dy ³⁺作为蓝色持续发光供体荧光粉，同时利用光转换剂将持续发光光谱从蓝色调到红色。复合红色发光材料的Sr ₂ MgSi系₂ ö ₇：Eu的²⁺，镝³⁺ /光转换剂（SMED / LCA）与光转换剂和Sr制成₂ MgSi系₂ ö ₇：Eu的²⁺，镝³⁺在一定的质量比。SiO ₂ (Al₂ O ₃或MgF ₂ )通过异相沉积法涂覆在SMED/LCA表面。在 X 射线衍射和发射光谱以及余辉亮度方面发射了所得样品的结构和光学特性。结果表明，发射光谱呈现出两个发射带，峰值位于 470 和 615 nm 附近。SiO ₂、Al ₂ O ₃和MgF ₂像保护壳一样包覆在SMED/LCA的表面以保持其稳定性和发光性能，余辉初始亮度仍高达0.37 cd/m ² CIE色坐标计算的余辉色纯度基本不变。