稀土多氟化物一维纳米材料的合成与发光性质

发布时间：2018-12-11 19:35

【摘要】：稀土多氟化物因其具有低声子能和丰富的4f能级,而被作为一种重要高效发光基质,其在医学检测、太阳能电池、色彩显示、生物标记物、防伪油墨等领域均有广泛的应用前景,已经成为热点研究课题之一,目前研究者们已经制备出多种形貌的稀土多氟化物的微纳米材料,而对于一维纳米结构的稀土多氟化物的研究却鲜有报道。静电纺丝技术操作方便、重复性好和效率高等特点,是一种合成一维微纳米材料的主要方法。因此,静电纺丝方法合成稀土多氟化物一维纳米材料是具有创新性又很有挑战性的课题。本文中采取静电纺丝法制备出PVP/稀土硝酸盐/醋酸钡复合纳米纤维,经高温加热,得到中间产物;采用双坩埚氟化技术,得到BaYF_5:Er~(3+)、BaY_2F8:Er~(3+)和Ba_4Y_3F17:Er~(3+)纳米纤维。采用XRD、EDS、SEM、TEM和PL现代测试方法对样品进行表征。结果表明,所制备的Ba YF_5:Er~(3+)、BaY_2F8:Er~(3+)和Ba_4Y_3F17:Er~(3+)纳米纤维分别为四方相、单斜相和菱方相;其直径大约为110-160 nm;掺杂Er~(3+)的BaYF_5、BaY_2F8和Ba_4Y_3F17纳米纤维是很好的上转换发光材料;讨论了上转化发光机理,得到了有意义的结果,为深入了解稀土离子掺杂多氟化物一维纳米材料的性能及应用打下了重要基础。
[Abstract]:Rare earth polyfluoride has been used as an important high efficient luminescent matrix for its low energy level and rich 4f energy level. It is used in medical detection, solar cells, color display, biomarkers, etc. Anti-counterfeiting ink and other fields have a wide range of application prospects, has become one of the hot research topics, researchers have prepared a variety of morphology of rare earth polyfluoride micro-nano materials, However, the study of rare earth polyfluoride with one-dimensional nanostructure is rarely reported. Electrospinning is a main method for the synthesis of one-dimensional micro / nano materials because of its advantages such as easy operation, good repeatability and high efficiency. Therefore, the synthesis of rare earth polyfluoride one-dimensional nanomaterials by electrostatic spinning is an innovative and challenging subject. In this paper, PVP/ rare earth nitrate / barium acetate composite nanofibers were prepared by electrospinning method, and the intermediate products were obtained by heating at high temperature. BaYF_5:Er~ (3), BaY_2F8:Er~ (3) and Ba_4Y_3F17:Er~ (3) nanofibers were prepared by double crucible fluorination. The samples were characterized by XRD,EDS,SEM,TEM and PL. The results show that the prepared Ba YF_5:Er~ (3), BaY_2F8:Er~ (3) and Ba_4Y_3F17:Er~ (3) nanofibers are tetragonal, monoclinic and rhombohedral, respectively, and their diameters are about 110-160 nm;. BaYF_5,BaY_2F8 and Ba_4Y_3F17 nanofibers doped with Er~ (3) are good up-conversion luminescent materials. The mechanism of up-conversion luminescence was discussed, and the significant results were obtained, which laid an important foundation for further understanding the properties and applications of rare-earth ions doped polyfluoride one-dimensional nano-materials.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

【参考文献】