Fabrication and Characterization of Y2O3∶Yb3+,Er3+ Upconversion Nanofibers by Electrospinning

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (1): 20.

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Fabrication and Characterization of Y₂O₃∶Yb³⁺,Er³⁺ Upconversion Nanofibers by Electrospinning

DONG Xiang-Ting*, LIU Li, WANG Jin-Xian, LIU Gui-Xia

School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China

Received:2009-02-23 Online:2010-01-10 Published:2010-01-10
Contact: DONG Xiang-Ting董相廷, 男, 博士, 教授, 博士生导师, 主要从事纳米材料研究. E-mail: dongxiangting888@yahoo.com.cn
Supported by:
吉林省科技发展计划重大项目(批准号: 20070402, 20060504)、教育部科学技术研究重点项目(批准号: 207026)、长春市科技计划项目(批准号: 2007045)、吉林省教育厅“十一五”科学技术研究项目(批准号: 2007-45, 2006JYT05)和吉林省环保局科技项目(批准号: 2006-24)资助.

Abstract

Abstract:

PVA/[Y(NO₃)₃+Yb(NO₃)₃+Er(NO₃)₃] composite nanofibers were fabricated by electrospinning. Y₂O₃∶Yb³⁺,Er³⁺ upconversion nanofibers were obtained by calcination of the relevant composite nanofibers. XRD analysis reveals that composite nanofibers are amorphous in structure, and Y₂O₃∶Yb³⁺,Er³⁺ upconversion nanofibers are cubic in structure with space group Ia3. SEM images indicate that the mean diameter of the composite nanofibers is ca. 150 nm, and the diameter of the fibers gradually decrease with the increase of calcinations temperature. Y₂O₃∶Yb³⁺,Er³⁺ upconversion nanofibers of 60 nm in average diameter were acquired at 600 ℃. TG-DTA analysis reveals that the water, organic compounds, nitrates in the composite nanofibers are decomposed and volatilized totally, and the mass of the sample kept constant when sintering temperature is above 600 ℃, and the total mass loss percentage is 83%. FTIR analysis manifest that the spectrum of the composite nanofibers is basically the same as that of the pure PVA, and Y₂O₃∶Yb³⁺,Er³⁺ upconversion nanofibers are formed above 600 ℃. The upconversion spectroscopic properties of the Y₂O₃∶Yb³⁺,Er³⁺ nanofibres were investigated under the excitation of a 980 nm continuous wave diode laser. Y₂O₃∶Yb³⁺, Er³⁺ nanofibres emitted strong green and red upconversion emissions centering at 521, 562 and 656 nm, respectively. The green emissions were attributed to the transitions of ²H_11/2/⁴S_3/2→⁴I_l5/2 energy levels of Er³⁺ ions, and the red emission was assigned to the transition of ⁴F_9/2→⁴I_l5/2 energy levels of Er³⁺ ions. The formation mechanism of Y₂O₃∶Yb³⁺,Er³⁺ upconversion nanofibers was advanced. The technique can be applied to fabrication of other rare earths composite oxides upconversion nanofibers.

Key words: Y2O3; Y2O3∶Yb3+,Er3+; Electrospinning; Upconversion nanofiber

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DONG Xiang-Ting*, LIU Li, WANG Jin-Xian, LIU Gui-Xia. Fabrication and Characterization of Y₂O₃∶Yb³⁺,Er³⁺ Upconversion Nanofibers by Electrospinning[J]. Chem. J. Chinese Universities, 2010, 31(1): 20.

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Fabrication and Characterization of Y₂O₃∶Yb³⁺,Er³⁺ Upconversion Nanofibers by Electrospinning

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