碱土铝酸盐长余辉发光材料的有机包覆及其表征

Organic Encapsulation on SrAl_2O_4∶Eu^(2+),Dy^(3+) Phosphors and Its Characterization

采用硅烷偶联剂(WAPS)改性,然后接枝甲基丙烯酸甲酯,对SrAl2O4∶Eu2+,Dy3+发光粉微粒进行表面包覆改性。IR、SEM和TEM测试结果表明,该有机包覆层由硅烷改性的聚甲基丙烯酸甲酯组成,是一种厚度为20～30nm的致密网状膜。耐水性、吸油量以及长余辉发光特性测试结果表明,有机包覆处理后的发光粉具有很好的耐水性能,较低的吸油量,同时依然保持较好的长余辉发光特性,荧光强度和余晖寿命分别约为包膜前的93%和95%。

Silane coupling agent(MAPS) was used to introduce polymerizable groups(MMA) on phosphors′ surface to form organic encapsulation for SrAl_ 2O_ 4∶Eu 2+,Dy 3+ phosphors. IR, SEM and TEM showed that the encapsulation film, which is composed of poly(methyl methacrylate) modified by silane, is a dense reticulation with a thickness of 20～30 nm. The water-resistance and oil absorption measurement results and persistent luminescent properties indicated that the encapsulated SrAl_ 2O_ 4∶Eu 2+,Dy 3+ phosphors had better water- resistance performance and lower oil absorption amount, and maintained good persistent photoluminescence properties. The fluorescence intensity and afterglow life of the phosphors were respectively reduced to 93% and 95% of that of the phosphor before organic encapsulation.