KZnF3：Ce^3＋,Tb^3＋纳米粒子合成与发光  

Synthesis and Fluorescence of KZnF_3:Ce^(3+),Tb^(3+) Nanoparticles

作　　者：朱国贤[1] 李永大[1] 闫景辉[1] 石春山[2] 

机构地区：[1]长春理工大学理学院 [2]中国科学院稀土化学与物理重点实验室,吉林长春130022

出　　处：《光谱学与光谱分析》2008年第3期534-537,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(90201032)资助

摘　　要：采用微乳液法合成了Ce3+,Tb3+单掺和双掺KZnF3纳米晶。分析了样品的结构与形态,结果表明,所合成的样品均为单相,颗粒粒度分布均匀。讨论了光谱特性,并与高温固相法合成的产物作了对比。研究发现,KZnF3:Ce3+纳米晶的发射光谱与体相多晶相比,最强峰位置红移约35nm;在KZnF3纳米晶双掺体系中存在Ce3+→Tb3+能量传递,尤其是Tb3+的5D4→7F5跃迁发射显著增强,有望成为一种有发展前途的绿色荧光材料。Phosphors of KZnF3：Ce^3＋,KZnF3：Tb^3＋ and KZnF3：Ce^3＋,Tb^3＋ nanoparticles were synthesized in a cetyltrimethylammonium bromide（CTAB）/2-octanol/water microemulsion system.X-ray diffraction（XRD） pattern was used to identify the formation of KZnF3 phase without detectable impurity.Environment scanning electron microscopy（ESEM） image showed that the average sizes of the KZnF3：Ce^3＋,Tb^3＋ nanocrystals were 30 nm in diameter.Photoluminescence characteristics of the rare earth ions doped nanoparticles were investigated and compared with that of the sample prepared by solid state reaction at a high temperature.The emission peak of the KZnF3：Ce^3＋ nanoparticles showed an obvious red shift as compared to that of polycrystalline powder.In a co-doped system of KZnF3 nanoparticles,the emission band of Ce^3＋ even could hardly be observed and the luminescence intensity of Tb^3＋ was increased much compared with that Tb-doped singly.This showed that the emission of the Tb^3＋ was sensitized by Ce^3＋.The experimental results indicated that there was an effective energy transfer from Ce^3＋ to Tb^3＋ in KZnF3 nanoparticles.

关 键 词：微乳液 稀土离子 KZnF3纳米晶 光致发光 能量传递 

分 类 号：O614.3[理学—无机化学]