泡沫塑料包覆SrAl2O4:Eu2+, Dy3+长余辉材料的耐水性能

利用废弃聚苯乙烯泡沫塑料作为包覆材料，采用简单的物理包覆技术对SrAl2O4∶Eu2+,Dy3+长余辉发光材料进行表面包覆。 X射线粉末衍射、傅里叶红外光谱、激发发射光谱、热重分析、透射电子显微镜观察和耐水性能测试等实验结果表明，包覆层薄，厚度为5~10 nm，聚苯乙烯泡沫塑料的包覆质量分数为4.9%，包覆没有改变材料的内部结构，对材料的发光性能影响较小。 包覆能有效改善材料的防水性能，经过15 h浸水后，材料初始发光强度依然达到5.02 cd/m2，余辉时间达到10 h以上。

Water Durability of Long Afterglow SrAl2O4∶Eu2+,Dy3+ Phosphor Encapsulated with Foamed Plastic

The long afterglow luminescent material of SrAl2O4∶ Eu2+,Dy3+ was encapsulated with polystyrene foamed plastic via a simple physical technology,and charaeterized by means of X-ray diffraction patterns,fourier transform infrared spectroscopy,excitation and emission spectra,thermogravimetric analysis,and transmission electron microscopy observation.Its water durability was investigated.The results show that the encapsulated layer has a thickness of about 5~10 nm and the mass fraction of encapsulation amount is about 4.9%.The encapsulation does not change the inner structure of the phosphor and has barely influence on their photoluminescence.The encapsulation can effectively improve the water durability of the phosphors with initial intensity of 5.02 cd/m2.The decay time can reach up to over 10 h after immersed in water for 15 h.