反相微乳液法制备EDTA-Eu掺杂SiO_2粒子及其荧光特性  

Synthesis and Fluorescence Properties of Europium(Ⅲ) Chelate-doped Fluorescent Silica Particles by Reverse Microemulsion Method

作　　者：陈野[1] 李飞[1] 郭艳宏[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《稀土》2010年第4期25-28,共4页Chinese Rare Earths

基　　金：教育部博士点基金(20050217019)

摘　　要：采用反相微乳液法,制备了稀土配合物EDTA-Eu掺杂的SiO2荧光粒子。x射线衍射分析表明所得粒子为非晶态,红外光谱分析表明EDTA中的羰基以双齿配位的形式与Eu3+配位。荧光光谱分析表明,在396nm处没有出现Eu3+的本征激发峰,而在310nm处出现一较强激发峰,表明配合物的激发谱由配体EDTA吸收能量引起,并将能量传递给Eu3+使之发出特征荧光,在310nm光激发下,发射波长位于615nm处,对应于Eu3+离子电偶极跃迁5D0-7F2,发射光谱中没有出现磁偶极跃迁5D0-7F1表明Eu3+的配合物中稀土离子处于不对称中心,掺杂的ED-TA-Eu与SiO2摩尔比在1:120～1:15之间时,随着EDTA-Eu的掺杂量的增加SiO2粒子的最大发射荧光强度成指数函数增长。Europium （Ⅲ） chelate-doped fluorescent silica particles were synthesized by reverse microemulsion method and Characterized with XRD,IR spectrum and fliorescence spectrocopy.The results show that the particles were noncrystalline the coordination forms of carbonyl with Eu3＋is double coordination.The intrinsic excitation peak at 396nm was not observed,and appeared at 310nm.The excitation spectrum of the complex was caused by EDTA absorbing energy and the energy was transfered to Eu3＋to make it to issue characteristic fluorescentce.Under excitation of 310 nm radiation,the emission wavelength is 615nm.The strong emission band of Eu3＋at 615 nm belongs to （5D0-7F2） electric dipole transition.As magnetic dipole transition（5D0-7F2 ）of Eu3＋was not observed,the Eu3＋in the complex was at the asymmetric center.Furthermore,when the molar ratio of EDTA-Eu to SiO2 was between 1：120 to 1：15,the fluorescence intensity will increase with the concentration of europium,and the growth is exponential growth.

关 键 词：荧光 稀土配合物 反相微乳法 SiO_2 

分 类 号：O657.3[理学—分析化学]