Abstract:

The Y2O3:Eu red-emitting nanophosphors were prepared by microwave-assisted sol-gel process. The heating mechanism for microwave irradiation was studied to rough observation FTIR spectra of precursor and sample. The results of XRD, TEM and PL indicate that the  Y₂O₃:Eu powder annealed [KG*4]at 700 ℃ for 2 h [KG*4]has [KG*4]optimal [KG*4]comprehensive [KG*4]properties [KG*4]and 96.3% of particles was distributed in the range of 15~27 nm with better fluorescence intensity. The photoshop of SEM show that agglomeration size of  Y₂O₃:Eu powder is smaller than 100 nm with scanty sphere distribution. Moreover, the nucleation, fluorescence, and dispersion of  Y₂O₃:Eu ultra-fine powder in polymer materials was investigated. The results show that small amount of  Y₂O₃:Eu ultra-fine powder in polypropylene can induces the crystallization into β- spherulitic structure, and small amount of that is beneficial for the dispersion of powder in polypropylene, but the fluorescence intensity is enhanced with the increase of additive.

Key words: Microwave irradiation,   , Ultra-fine powder,      Y₂O₃:Eu,   ,  Dispersion,   , Polypropylene

摘要： 利用微波辅助溶胶凝胶法得到纳米Y₂O₃ :Eu 红色荧光粉。对前驱体和试样进行了红外(FTIR)微结构分析, 从试样显微结构分析了微波辐射加热机制。借助X 射线衍射仪(XRD)、透射电镜(TEM)和荧光光谱(PL), 对所得粉体进行了表征。结果表明, 在700 ℃的温度下保温2 h 所得Y₂O₃ :Eu 粉体具有较佳的综合性能, 96.3%的颗粒分布在15 ～ 27 nm , 且具有较好的荧光强度。扫描电镜(S EM)照片表明, Y2O3 :Eu 粉体呈疏松状分布, 其表观软团聚尺寸小于100 nm 。考察了Y₂O₃ :Eu 粉体在聚丙烯(pp)中的成核、荧光和分散效果。结果表明, 所添加的微量的Y2O3 :Eu 粉体具有成核作用, 有利于粉体在pp 中均匀分散, 但pp 样品荧光强度随着粉体添加量的增加而提高。

关键词: 微波辐射 , 超细粉体 ,  Y₂O₃ :Eu , 分散 , 聚丙烯