Sr3SiO5:Eu2+和Sr3SiO5:Eu2+, Dy3+荧光粉的黄色长余辉性质

摘要

用高温固相法制备了Sr3SiO5:Eu2+和Sr3SiO5:Eu2+, Dy3+荧光粉.在紫外光辐照后, Sr3SiO5:Eu2+和Sr3SiO5:Eu2+, Dy3+荧光粉具有明亮的黄色长余辉,源于Eu2+的4f65d - 4f7的跃迁.紫外光激发停止后,Sr3SiO5:Eu2+的余辉时间是4 h以上.余辉衰减曲线和热释光曲线说明了引入Dy3+离子可以产生大量的深陷阱和浅陷阱.产生的深陷阱使余辉时间延长到6 h以上.由热释发光曲线,根据热释光的通用级公式拟合了陷阱深度.Sr3SiO5:Eu2+和Sr3SiO5:Eu2+, Dy3+荧光粉是有应用前景的黄色长余辉材料.%Sr3SiO5:Eu2+ and Sr3SiO5:Eu2+, Dy3+ phosphors have been synthesized through the solid-state reaction technique. We observed long lasting yellow phosphorescence in Sr3SiO5:Eu2+ and Sr3SiO5:Eu2+, Dy3+ phosphors, originating from 4f65d-4f7 transition of Eu2+, after UV exposure. The phosphorescence in Sr3SiO5:Eu2+ can be observed by naked eyes for more than 4 hours after the termination of excitation light. The decay patterns of phosphorescence and thermoluminescence curves demonstrate that introduction of Dy3+ into Sr3SiO5:Eu2+ can generate lots of shallow traps and deep traps. The generated deep traps prolong the phosphorescence up to 6 hours after UV irradiation. The depths of traps are obtained by fitting the thermoluminescence experimental data to the general order kinetics formula.