Y2O2S:Eu3+,Zn2+,Ti4+荧光体的缺陷及红色长余辉发光性质

采用高温固相法合成了红色长余辉材料Y2O2S:Eu3+,Zn2+,Ti4+,实现了余辉发光中心和缺陷中心之间的能量传递。通过XRD、荧光发射和激发光谱、余辉发射光谱与衰减曲线、色坐标和热释光谱测试手段对Y2O2S:Eu3+,Zn2+、Y2O2S:Eu3+,Ti4+、Y2O2S:Eu3+,Zn2+,Ti4+和Y2O2S:Eu3+,Mg2+,Ti4+进行了结构与性能的表征,发现其荧光发射与余辉发射基本一致,红色余辉发光主峰位于625 nm附近,来源于Eu3+的5D0→7F2跃迁发射。相比而言,Y2O2S:Eu3+,Zn2+,Ti4+余辉发光性能最好,可持续1.5 h左右。

Red Long Lasting Phosphorescence Properties of Y2O2S: Eu3 +, Zn2 + , Ti4 +

A novel long afterglow phosphor Y₂O₂S:Eu³⁺,Zn²⁺,Ti⁴⁺ was synthesized by the solid state method. The energy transfer between persistent luminescence centers and defect centers occurs. The structures and optical properties of Y₂O₂S:Eu³⁺,Zn²⁺, Y₂O₂S:Eu³⁺,,Ti⁴⁺, Y₂O₂S:Eu³⁺,Zn²⁺,Ti⁴⁺and Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺ materials were characterized by X-ray diffraction (XRD), photoluminescence and excitation spectra, persistent luminescence spectra and decay curves and thermoluminescence. The results showed that their fluorescence properties were similar with the persistent luminescence. Their emission peaks all located at 625 nm due to ⁵D₀→⁷F₂ transition of Eu³⁺ions. In comparison, the persistent luminescence performance of Y₂O₂S:Eu³⁺,Zn²⁺,Ti⁴⁺ sample was the best, maintaining about 1.5 h.