Synthesis and luminescence properties of YF₃:Eu³⁺ hollow nanofibers via the combination of electrospinning with fluorination technique

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• 作者：Dan Li ; Wensheng Yu ; Xiangting Dong ; ^{dongxiangting888@163.com} ; Jinxian Wang ; Guixia Liu
• 关键词：Yttrium trifluoride ; Nanofibers ; Hollow nanofibers ; Electrospinning ; Luminescence properties
• 刊名：Journal of Fluorine Chemistry
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：145
• 期：Complete
• 页码：70-76
• 全文大小：1007 K

文摘

Y₂O₃:Eu³⁺ hollow nanofibers were prepared by calcination of the electrospun PVP/[Y(NO₃)₃ + Eu(NO₃)₃] composite nanofibers, and then YF₃:Eu³⁺ hollow nanofibers were successfully synthesized by fluorination of the as-prepared Y₂O₃:Eu³⁺ hollow nanofibers via a double-crucible method using NH₄HF₂ as fluorinating agent for the first time. X-ray diffraction (XRD) analysis showed that YF₃:Eu³⁺ hollow nanofibers were pure orthorhombic structure with space group Pnma. Transmission electron microscope (TEM) and scanning electron microscope (SEM) observations indicated that as-obtained YF₃:Eu³⁺ nanofibers were hollow-centered structure with the mean diameter of 197 ¡À 34 nm. Under the excitation of 394 nm ultraviolet light, YF₃:Eu³⁺ hollow nanofibers exhibited red emissions of predominant peaks at 587 nm and 593 nm originating from ⁵D₀ ¡ú ⁷F₁ transition of the Eu³⁺ ions, which suggested Eu³⁺ ion in YF₃ crystal is at a site of C₂ symmetry. Moreover, the emitting colors of YF₃:Eu³⁺ hollow nanofibers are located in the red region in CIE chromaticity coordinates diagram. The luminescent intensity of YF₃:Eu³⁺ hollow nanofibers was increased remarkably with the increasing doping concentration of Eu³⁺ ions and reached a maximum at 9 mol % of Eu³⁺. The possible formation mechanism of YF₃:Eu³⁺ hollow nanofibers was also discussed. This preparation technique could be applied to prepare other rare earth fluoride hollow nanofibers.