材料期刊网

采用高温固相法制备了夜光纤维用Sr2MgSi2O7∶Eu^2＋,Dy^3＋蓝色长余辉发光材料,结合夜光纤维对发光材料性能的要求,通过X射线衍射图谱、荧光光谱、余辉衰减曲线及热释光谱对材料的结构、发光性能和陷阱能级分布进行了表征,重点分析了稀土离子Eu2＋和Dy3＋的掺量及比例的变化对材料余辉过程和陷阱能级分布的影响。结果表明适中的Dy3＋掺量能产生合适的陷阱能级,从而获得较好的余辉效果,Dy3＋掺量不同但衰减规律相似,经拟合余辉衰减包括快衰减、中衰减、慢衰减3个过程。而当Dy3＋掺量不变,Eu2＋掺量达到0.05mol时,发光强度骤然下降,出现发光淬灭。随着Dy3＋掺量的增加,陷阱能级的深度E值逐渐变大,当Dy3＋掺量增加到0.06mol时,E值反而大幅降低。

The blue long afterglow photoluminescent materials Sr2MgSi2O7∶Eu^2+,Dy^3+ for luminescent fiber were prepared by solid sintering technology.According to the luminous fibers requirements for luminescent materials,the phase structure,luminescent properties and trap level distribution were characterized XRD patterns,fluorescence spectrum,afterglow decay curves and thermoluminescence spectrum.It was mainly analyzed that the content and proportion change of rare-earth ion Eu2+ and Dy3+ affected the afterglow process and trap level distribution of luminescent materials.The results indicated that the moderate content of Dy3+ can form the suitable trap level and obtain the better afterglow effect.The decay laws of samples with different additions of Dy3+ were similar,which was consist of a fast initial decay,inter-mediate decay and long decay by using the fitting function.When the content of Eu2+ was 0.05mol,the luminescent intensity was declined evidently and showed the phenomenon of luminescent quench.The depth of trap level E was deepened following by the increasing of addition of Dy3+.When it was reaching to 0.06mol,the value of E was instead dropped dramatically.