会议专题

Phase Control of Nanosized NaYF4 Upconversion Particles

  The hexagonal phase NaYF4 (Na(Y1.5Na0.5)F6,β-NaYF4 type) is a kind of ideal host materials for upconversion luminescence with high efficiency.The synthesis of monophase hexagonal NaYF4∶Yb3+/Er3+ nanoparticles has been investigated by solvothermal processing under 200° for 24hrs.It was found that solvents adopted had a great impact on formation of β-NaYF4.X-ray diffraction patterns indicated that monophase α-NaYF4 and β-NaYF4 nanosized grains could be synthesized successfully under environment of ethanol and oleic acid respectively,whereas the mixture of α-NaYF4 and Na5Y9F32 phases were obtained when water was used as solvent.The synthesized pure β-NaYF4 nanoparticles were uniformly monodispersed in hexagonal shape with typical length of 150~200nm and diameter of 50~100nm.Selected area electron diffraction observation revealed that the as-prepared nanorods are of single crystalline nature.By co-doping (20%)Yb-(2%)Er,the β-NaYF4 nanosized grains exhibited bright green upconversion luminescence centered at 538nm under the radiation of near-infrared (NIR) laser(nm).The FTIR spectrum shows theβ-NaYF4 have the potential of water-solubility for the strong bands at around 3444 and 1634 cm-1.

NaYF4∶Yb3+/Er3+ Solvothermal synthesis Upconversion spectroscopy

Jing Guo Feizhong Ma Ying Shi Jianjun Xie

Department of Electronics and Information Materials,School of Material Science and Engineering,Shanghai University,Shanghai 200072,P.R.China

国际会议

The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

厦门

英文

235-238

2011-11-04(万方平台首次上网日期,不代表论文的发表时间)