钠铝氟化物包覆BaF_2材料上转换发光性能  

Upconversion Properties of Sodium and Aluminum Fluorides Coated BaF_2 Material

作　　者：刘恩周[1] 樊君[1] 胡晓云[2] 叶岩溪[2] 侯文倩[1] 

机构地区：[1]西北大学化工学院,陕西西安710069 [2]西北大学物理学系,陕西西安710069

出　　处：《光谱学与光谱分析》2012年第1期61-64,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20876125);高等学校博士点基金项目(20096101110013);陕西省自然科学基金项目(2010JZ002);西北大学研究生交叉学科项目(09YJC24;09YJC27)资助

摘　　要：采用水热法合成了一种非稀土上转换发光材料,由钠铝氟化物和BaF2组成。采用X射线衍射(XRD)、傅里叶红外光谱(FTIR)和扫描电镜(SEM)对其进行了表征,分析表明,钠铝氟化物主要以NaF和Na3AlF6两种晶态存在于BaF2晶体表面,形成化学复合,呈现包覆结构。荧光光谱测试表明,样品在583nm可见光和863nm近红外光室温激发下,均能产生304和324nm的宽波段紫外光发射。时间分辨光谱表明,发光均有一个上升和衰减过程,衰减大约自15ms开始,磷光寿命大于18.4ms。借助上转换发光能量转换过程对发光机理进行了研究,分析表明,发光源于量子限制效应的带间光吸收和界面缺陷的光吸收,发光机制属于量子限制效应-界面发光中心复合发光。Sodium and aluminum fluorides coated BaF2 was synthesized by hydrothermal meth od.It was characterized by X-ray diffraction（XRD）,Fourier transform infrare d spectroscopy（FTIR）,scanning electron microscopy（SEM） and fluorescence spect rophotometer,respectively.The analysis results indicated that sodium and alum inum fluorides existed in the form of sodium fluoride and sodium fluoroaluminate,which combined with BaF2 surface via chemical bonds,and exhibited coated st ructure.Fluorescence spectroscopy testing showed that there were two wide upc onversion emission peaks with maxima at 304 and 324 nm under the excitation at 5 83 and 863 nm,respectively.Its phosphorescence life time was greater than 18.4 ms,and the emission intensity exhibited a rising process from the beginning and a decaying process after 15 ms.The luminescence mechanism was proposed ac cording to the energy conversion process of the upconversion emission,the resul ts showed that the upconversion emission belonged to the quantum confinement eff ect-interface light emission center radiative recombination.

关 键 词：氟化钡 包覆结构 上转换发光材料 磷光寿命 发光特性 

分 类 号：O482.3[理学—固体物理] O613.4[理学—物理]