β-NaYF_4∶Yb^(3+),Ho^(3+)@SiO_2纳米复合材料的合成及上转换发光性质  

Synthesis and upconversion luminescence property of β-NaYF_4∶Yb^(3+),Ho^(3+)@SiO_2 nanocomposite

作　　者：张国[1] 郭卫华[1] 江元汝[1] 柴瑞涛[1] 苗波波[1] 

机构地区：[1]西安建筑科技大学理学院,西安710055

出　　处：《化工新型材料》2016年第5期127-129,共3页New Chemical Materials

基　　金：国家自然科学青年基金(21205092);陕西省自然科学基金面上项目(2014JM2044);陕西省重点实验室开放基金资助项目(2014SKYWK004);西安建筑科技大学人才建设(RC1213;RC1306;QN1434)

摘　　要：利用高温溶剂热法合成NaYF_4∶Yb^(3+),Ho^(3+)上转换纳米粒子(UCNPs),并利用反相微乳液法在纳米颗粒上包覆一层SiO_2,形成NaYF_4∶Yb^(3+),Ho^(3+)@SiO_2核壳结构(UCNPs@SiO_2)。通过XRD、TEM、傅里叶转换红外光谱及荧光光谱对所合成的材料进行表征。结果表明,UCNPs晶相为纯六方相,粒径约45nm,SiO_2成功包覆在UCNPs上,壳层厚约15nm;在980nm近红外光激发下发射542nm绿光。UCNPs@SiO_2上转换发光材料在生物成像中有潜在的应用。NaYF_4∶Yb3＋,Ho3＋nanoparticles（UCNPs）with upconversion luminescence were synthesized via high temperature solvent-thermal method,and NaYF_4∶Yb3＋,Ho3＋@SiO_2（UCNPs@SiO_2）core-shell nanocomposites were synthesized with reverse microemulsion method to form a layer of SiO_2 onto the surface of the nanoparticles.The as-synthesized nanocomposites were characterized by X-ray diffraction（XRD）,transmission electron microscope（TEM）,fouriertransform infrared（FT-IR）spectrum and fluorescence spectroscopy.The results showed that UCNPs were pure hexagonal phase with the diameter of about 45 nm,SiO_2 was successfully coated onto the surface of UCNPs,and the shell size was about 15 nm.UCNPs and UCNPs@SiO_2nanocomposites emited 542 nm green light under the excitation of 980 nm infrared light,which may have potential applications in bioimaging.

关 键 词：上转换发光纳米材料 稀土离子 核壳结构 表面修饰 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ422[化学工程]