摘要
采用静电纺丝技术制备了PVP/[Y(NO3)3+Er(NO3)3]复合纳米纤维,经过氧化焙烧得到Y2O3:Er3+纳米纤维,再通过双坩埚氟化法制得YF3:Er3+纳米纤维。通过XRD、SEM、EDS和荧光光谱分析对样品的形貌和性质进行了表征。结果表明所制得YF3:Er3+纳米纤维是纯正交相,带有空间群Pnma。YF3:Er3+纳米纤维的直径大约为(89±11)nm且分布均匀。上转换发射光谱分析显示,在980nm激发下,YF3:Er3+纳米纤维在526、543和653nm处发射出强的绿光和弱的红光,它们分别归属于Er3+的2 H11/2→4I15/2、4S3/2→4I15/2和4F9/2→4Il5/2能级跃迁;在532nm可见光激发下,YF3:Er3+纳米纤维能够在1.52μm处产生近红外发射。随着Er3+浓度的增加,YF3:Er3+纳米纤维发光强度逐渐增大。由色坐标(CIE)图可知,YF3:Er3+纳米纤维所发射的颜色位于色坐标的绿光区。此外,还提出了YF3:Er3+纳米纤维可能的形成机理。
YF3 ：Er^3＋ nanofibers have been successfully fabricated via fluorination of the relevant Y2O3 ：Er^3＋ nanofibers which were obtained by calcining the electrospun PVP/[Y（NO3 ）3 ＋Er（NO3 ）3] composite nanofibers. The morphology and properties of the products were investigated by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, energy dispersion spectrosco py （EDS） and fluorescence spectroscopy. The results showed that YF3 ：Era＋ nanofibers are pure orthorhombic phase with space group Pnma and the diameter of YF3 ：Era＋ nanofibers is （89 ± 11） nm. Upconversion emission spectrum analysis indicated that YF3 ： Era＋ nanofibers emit strong green and weak red light centered at 526, 543 and 653 nm, respectively, under the excitation of a 980 nm diode laser. The green emissions and the red emission are respectively attributed to ^2H11/2/^4 S3/2→4 I15/2 and 4 F9/2→4 I15/2 energy level transitions of the Era＋ ions. The YF3 ：Er3＋ nanofibers emit nea^infrared emission centered at 1.52 μm under the excitation of 532 nm laser. Moreover, the emitting colors of the YFa ：Era＋ nanofibers are located in the green region in CIE chroma ticity coordinates diagram. The luminescent intensity of the YF3： Er3＋ nanofibers increases remarkably with the increase of doping concentration of Era＋ ions. Moreover, the possible formation mechanism of YF3： Er3＋ nanofibers is also discussed.
出处
《中国科技论文》
CAS
北大核心
2014年第3期327-332,共6页
China Sciencepaper
基金
国家自然科学基金资助项目(50972020
51072026)
高等学校博士学科点专项科研基金资助项目(20102216110002
20112216120003)
吉林省科技发展计划重大项目(20130101001JC
20070402
20060504)
教育部科学技术研究重点项目(207026)
吉林省教育厅"十一五"科学技术研究项目(2010JYT01)
关键词
无机化学
氟化钇
静电纺丝
纳米纤维
上转换发光
inorganic chemistry
yttrium trifluoride
electrospinning
nanofibers
upconversion luminescence
