摘要
首次研究了以Nd3+离子为辅助激活剂,对Eu2+掺杂的发光材料Sr4Al14O25∶Eu2+余辉性能的影响。用溶胶凝胶法合成了Eu2+,Nd3+共掺杂的Sr4Al14O25∶Eu2+,Nd3+发光粉末,并用扫描电镜、X射线衍射计、荧光分光光度计、余辉亮度测试仪、热释光剂量计等手段对粉末样品进行了表征。结果表明,在1350℃得到了单一的Sr4Al14O25相,粉末颗粒平均粒度在1μm左右。Eu2+,Nd3+共掺杂的Sr4Al14O25∶Eu2+,Nd3+发光粉末有402和485nm两个发射峰,与Eu2+单掺杂的Sr4Al14O25∶Eu2+相比,发射峰位置没有变化,但适量的掺杂可以大大提高余辉时间和余辉亮度,余辉时间可达18h以上。最后通过对热释光谱的分析解释了双掺杂发光粉余辉性能增强的原因,适宜深度的陷阱可以有效存储光能,增强余辉的时间和强度。
The modification effect of the doping of Nd3＋ ions, as an auxiliary activator, onto the long afterglow properties of Eu2＋ doped Sr4AI14 O25 ： Eu2＋ phosphor was studied for the first time. Eu2＋, Nd3＋ co-doped Sr4Al14O25： Eu2＋ ,Nd3＋ phosphors were prepared by sol-gel method, and the target powders were investigated by SEM, XRD, fluorescence spectrophotometer, digital phosphorophotometer and thermoluminescenee tester. The experimental results indicate that the single-phase Sr4Al14O25 was formed at 1350℃ ; the average particle size of the Sr, Al14O25 ： Eu2＋ , Nd3＋ phosphor is about 1μm. Eu2＋ , Nd3＋ co-doped Sr4Al14 O25： Eu2＋ , Nd3＋ phosphor has two emission peaks at 402 and 485nm, no change was found when compared with that of Eu2＋ doped Sr4Al14O25： Eu2＋ phosphor, hut the appropriate doping concentration largely improves phosphorescence of the phosphors with more intense luminescence, higher brightness. The afterglow time can persist more than 18h. Finally, the cause of the enhancement of co-doped phosphor＇s long-lasting properties was explained by the analysis of phosphor＇s thermoluminescence spectra that the trap which has appropriate depth ean conserve energy effectively, and enhance afterglow time and intensity.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第11期1783-1786,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(60477034)
