微波等离子体法合成SrAl_2O_4:Eu~(2+),Dy~(3+)中激活剂的浓度猝灭研究

采用微波等离子体法合成SrAl_2O_4:Eu~(2+),Dy~(3+)长余辉发光材料,通过对掺杂不同激活剂浓度的产物的光谱性能、余辉性能、相组成结构的分析以及晶胞常数的计算,探讨了微波等离子体法合成srAl_2O_4:Eu~(2+),Dy~(3+)时,激活剂Eu~(2+)的浓度猝灭特性.XRD测试结果表明,Eu~(2+)离子的掺入对基质晶格畸变影响很小;光谱和余辉性能测试表明Eu~(2+)的掺杂浓度对产物的瞬时发光强度影响较大,相对而言对余辉性能的影响程度不大.产物的发光性能随Eu~(2+)摩尔浓度的增大呈现先增强后减弱的趋势,发光中心Eu~(2+)离子的猝灭浓度为4%.结合EDX结果说明,与高温固相法以及其他一些方法相比,采用微波等离子体合成技术可在一定程度上提高Eu~(2+)离子的临界猝灭浓度,从而为进一步提高长余辉发光材料的发光性能提供了可能.

Concentration Quenching of Eu~(2+) in SrAl_2O_4 :Eu~(2+),Dy~(3+) Long Persistence Phosphors Synthesized by Microwave Plasma

SrAl_2O_4 :Eu~(2+),Dy~(3+) long persistence phos-phors were synthesized by microwave plasma. The concentration quenching character of activator Eu~(2+) was investigated. The XRD results indicated that the effects of Eu~(2+) on lattice distortion was little, however the spectra and afterglow properties showed that the luminescent intensity and the afterglow properties of phosphors were improved by increasing Eu~(2+) content, but suppressed by excessive doping. The quenching concentration of Eu~(2+) was 4%, which was higher than the ones of high temperature solid state method and other methods. Combining the above results and EDX results, it was concluded that the microwave plasma synthesis can improve concentration quenching charac-ter of Eu~(2+) to some extent, so it provided a possibility to further enhance the long afterglow luminescent in-tensity.