纳米 Sr2MgSi2O7: Eu2+, Dy3+的长余辉发光行为

无机材料学报, 2005, 20(1): 220-224.

纳米 Sr₂MgSi₂O₇: Eu²⁺, Dy³⁺的长余辉发光行为

The State Key Lab of etal Matrix composites, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China)

关键词：硅酸盐 , luminescent material , long lasting , thermal stimulated luminescence

Long Lasting Behavior of Nano-sized Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺ Phosphor

MAO Da-Li , ZHAO Li , CHANG Cheng-Kang , FEI Qin , JIANG Lin

Keywords： silicate , 长余辉 , 发光材料 , 热释光

使用溶胶-凝胶技术合成纳米尺度的Sr₂MgSi₂O₇: Eu²⁺,Dy³⁺长余辉发光材料, 比较了该方法与固相法获得的长余辉粉体的光致发光行为和长余辉性能. 溶胶-凝胶获得的纯
相Sr₂MgSi₂O₇: Eu²⁺,Dy³⁺+长余辉粉体是由纳米尺度的微晶形成的团聚颗粒, 具有光致发光行为和长余辉发光特性. 其发射峰位于465nm. 而固相合成的粉体具有两个发射
峰, 分别位于404nm和459nm. 产生这些差别的原因在于Eu²⁺在基质晶格中的不同配位情况. 固相合成的粉体的余辉发光性能高于溶胶-凝胶粉体, 其原因在于高温固相合成在基质内部产
生了更高浓度的电子陷阱.

Nano-sized Sr₂MgSi₂O₇: Eu²⁺,Dy³⁺ phosphor with long lasting behavior was synthesized by a sol-gel method. The chemical reaction process during calcination, and the luminescent property
of the obtained phosphor, were investigated in detail. The result indicated that the phosphor obtained by the sol-gel method, which showed photoluminescence and long lasting behavior, was consisted
of nano-sized grains about 50nm. The sol-gel-derived phosphor gave out a visible light upon UV illumination peaking at 465nm, while the phosphor obtained by solid reaction showed two emission peaks upon
UV irradiation at 404nm and 459nm respectively. The difference in emission spectra can be ascribed to the different coordinators formed within the silicate matrix. The phosphor synthesized by solid
reaction exhibited a better afterglow character than the phosphor obtained by the sol-gel method, due to a higher trap concentration which was formed by a higher reaction temperature.

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