通过水热共沉淀方法制备了亚微米长余辉发光材料Sr2MgSi2O7∶Eu2+,Dy3+, 使用X射线衍射、扫描电镜、光致发光以及热释发光光谱对所合成的材料进行了研究。结果表明: 在1 000 ℃下烧结4 h的样品为四方晶系单相, 结晶度随着烧结温度的升高而进一步改善, 所制备的材料分散性良好, 尺寸在200～300 nm之间。在399 nm激发下, 样品呈现出主峰位于467 nm的蓝光发射, 来自于Eu2+的5d-4f跃迁。在1 100 ℃烧结获得的样品的长余辉发光优于1 000 ℃烧结的样品。样品的热释光谱为一个不对称分布的宽带, 主峰位于330～340 K之间, 热释光谱对应的峰值范围有利于产生长余辉发光。

Long-lasting phosphors Sr2MgSi2O7∶Eu2+,Dy3+ were synthesized via hydrothermal-precipitation route. X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), as well as thermoluimnescence (TL) were utilized to characterize the long-lasting phosphors. XRD analysis indicates the obtained Sr2MgSi2O7 ∶Eu2+,Dy3+ sample annealed at 1 000 ℃ for 4 h is tetragonal crystal phase. The crystallinity increases with temperature. The obtained phosphors consist of well dispersed submicron particles with a narrow size distribution of 200～300 nm, and these phosphor particles show blue emission corresponding to 5d-4f (467 nm) of Eu2+ under the excitation of visible light (399 nm). The afterglow time of sample synthesized at 1 100 ℃ is longer than those synthesized at 1 000 ℃ and 1 050 ℃. The thermoluminescence spectra of samples show broad bands centering at 330～340 K, which is suitable for the generation of long-lasting phosphorescence.