摘要
采用静电纺丝技术制备了Y2O3∶Eu3+纳米纤维,使用NH4HF2为氟化剂,经双坩埚法氟化和脱氨后得到YF3∶Eu3+纳米纤维,再采用静电纺丝技术制备了YF3∶Eu3+纳米纤维/PVP复合纳米纤维.XRD分析表明,立方相的Y2O3∶Eu3+氟化后,得到了正交相的YF3∶Eu3+纳米纤维,空间群为Pnma,YF3∶Eu3+纳米纤维/PVP复合纳米纤维具有明显的YF3∶Eu3+的衍射峰.SEM分析表明,YF3∶Eu3+纳米纤维与YF3∶Eu3+纳米纤维/PVP复合纳米纤维的直径分别为(91±11)和(319±43)nm,表面光滑.用Shapiro-Wilk方法检验,纤维直径属于正态分布.TEM分析表明,长度为500~1500 nm的YF3∶Eu3+纳米纤维被PVP包覆在内部,沿YF3∶Eu3+纳米纤维/PVP复合纳米纤维走向分布.荧光光谱分析表明,YF3∶Eu3+纳米纤维和YF3∶Eu3+纳米纤维/PVP复合纳米纤维的最强发射峰均位于588和595 nm,属于Eu3+的5D0→7F1跃迁,表明Eu3+占据YF3基质中Y3+晶格点的C2对称格位.PVP对YF3∶Eu3+发光峰位无影响,但发光强度降低;YF3∶Eu3+的含量与YF3∶Eu3+纳米纤维/PVP复合纳米纤维的发光强度呈线性关系.
Y2O3∶Eu3＋ nanofibers were prepared by electrospinning,and then YF3∶Eu3＋ nanofibers were obtained by fluorination of the relevant Y2O3∶Eu3＋ nanofibers followed by deammoniation process via double-crucible method using NH4HF2 as fluorinating agent.YF3∶Eu3＋ nanofibers/PVP composite nanofibers were fabricated using electrospinning technique again.XRD analysis indicate that orthorhombic YF3∶Eu3＋ nanofibers with space group Pnma were acquired through fluorination of the cubic Y2O3∶Eu3＋ nanofibers.YF3∶Eu3＋ nanofibers/PVP composite nanofibers possess obvious diffraction peaks of YF3∶Eu3＋.SEM reveal that diameters of YF3∶Eu3＋ nanofibers and YF3∶Eu3＋ nanofibers/PVP composite nanofibers are（91±11） and（319±43） nm,respectively,and the surface of these fibers are smooth.The diameters of fibers analyzed by Shapiro-Wilk method are normal distribution.TEM analysis show that YF3∶Eu3＋nanofibers with length of 500—1500 nm are embedded in PVP and distributed along with the length direction of the YF3∶Eu3＋ nanofibers/PVP composite nanofibers.Fluorescence spectra analysis manifest that YF3∶Eu3＋ nanofibers and YF3∶Eu3＋ nanofibers/PVP composite nanofibers emit the strongest emission peaks at 588 and 595 nm originating from the transition 5D0→7F1 of Eu3＋,which suggests Eu3＋ ion in YF3 crystal is at a site of C-2 symmetry.PVP has no effects on the wavelength of the emission peaks of YF3∶Eu3＋,but the luminescent intensity is decreased.Relationship between YF3∶Eu3＋ contents and luminescence intensity for YF3∶Eu3＋ nanofibers/PVP composite nanofibers presents linearity.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第2期225-230,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金项目(批准号:50972020)
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:200745
2005109)资助
关键词
氟化钇
静电纺丝
纳米纤维
复合纤维
发光材料
Yttrium trifluoride
Electrospinning
Nanofibers
Composite fibers
Phosphors
