摘要
采用静电纺丝技术结合高温煅烧工艺,制备了稀土铽离子掺杂的氧基磷灰石型硅酸盐[Ca2Y8(SiO4)6O2:Tb3+]荧光纳米纤维。利用XRD,FT-IR,TG-DTA,SEM,HRTEM和荧光光谱仪等分析测试手段对样品的组成、结构和性能进行了表征。结果表明:前驱体纤维经800℃煅烧4 h后,获得的Ca2Y8(SiO4)6O2:Tb3+荧光纳米纤维,属于六方晶系,P63/m空间群,其平均直径为100 nm。在245 nm的紫外光激发下,Tb3+的发射光谱由蓝光区和绿光区两部分组成,前者在382,417和438 nm处的发射峰对应于Tb3+的5D3→7FJ(J=6,5,4)跃迁;后者在489,545,590和622 nm处的发射峰对应5D4→7FJ(J=6,5,4,3)跃迁,其中以5D4→7F5(545 nm)跃迁的发射峰为最强,呈现绿光特性,Tb3+的光致发光衰减曲线符合单指数行为,其荧光寿命达2.65 ms。
Tb3＋ doped Ca2Y8 （SiO4 ）602 fluorescent nanofibers were synthesized via combination of high tempera- ture calcinations and electrospinning technique. The as prepared samples were characterized by X-ray diffraction （XRD）. Fourier transformed infrared spectroscopy （ FT-IR）, thermogravimetry-differential thermal analysis （ TG- DAT）, scanning electron microscopy（ SEM）, high-resolution transmission electron microscopy （HRTEM） and pho- toluminescence spectra （PL）. The pure phase of Ca2Ys （SiO4）602：Tb3＋ fluorescent nanofibers was obtained by calcination of the relevant composite fibers at 800 ~C for 4 h. They belong to hexagonal crystal system with space group P63/m and average diameters was 100 nm. The emission spectrum of Tb3＋ excited by ultraviolet light of 245 nm was composed of blue emission and green emission, the former could be ascribed to 5 D3_7 FJ （ J = 6, 5, 4 ） transition of Tb3＋ , located at 382, 417 and 438 nm respectively, while the latter was due of 5D4→TFJ（J =6, 5, 4, 3） transition of Tb3＋ , located at 489, 545, 590 and 622 nm respectively with the transition 5D4→7F5 （at 543 nm） being the most prominent group, characterized green emission. The luminescence decay curve of Ca2Ys （SiO4 ）602 ：Tb3＋ nanofibers showed single exponential behavior, and the lifetime was about 2.65 ms.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第6期657-663,共7页
Journal of the Chinese Society of Rare Earths
基金
吉林省自然科学基金项目(201205034
20140101118JC)
吉林省教育厅"十二五"科学技术研究项目(2012500)资助
