水相合成技术制备ZnS∶Eu^(3+)量子点及其光谱研究  

ZnS∶Eu^(3+)Quantum Dots Synthesized in Aqueous Solution and Its Optical Properties

作　　者：安海萍[1] 李岚[1] 张晓松[1] 王达健[1] 韩旭[1] 

机构地区：[1]天津理工大学材料物理所天津市光电显示材料与器件重点实验室,天津300191

出　　处：《液晶与显示》2006年第6期620-624,共5页Chinese Journal of Liquid Crystals and Displays

基　　金：天津市科技创新能力与环境建设平台项目(No.DTXTJJC14600);天津市自然科学基金;天津市教委基金资助;天津理工学院科技发展基金资助项目(No.Lg04032)

摘　　要：采用水相合成技术制备了不同Eu3+浓度掺杂的ZnS∶Eu3+量子点,经透射电子显微镜(TEM)和X射线粉末衍射(XRD)分析显示合成的量子点粒度分布均匀,平均粒径约4nm左右且分散性好,晶体结构为闪锌矿结构。荧光光谱表明铕离子的两个特征峰(591nm和614nm)呈窄带高斯分布,且强度之比随浓度的变化呈现不同的增强趋势,分析认为铕离子的浓度会影响其处于ZnS晶格不同对称中心位置的几率分布,铕离子的场对称性随着其浓度的增加而减弱。另外还对该产物发光强度的稳定性进行了分析。ZnS quantum dots doped with different concentrations of Eu^3＋ were synthesized in aqueous solution. The TEM and XRD showed that ZnS：Eu^3＋ quantum dots obtained have good dispersity with average size about 4 nm and belong to the cubic structure, the same structure as the bulk ZnS materials. Photoluminescence emission spectrum shows that there are two narrow and symmetrical emission peaks at 614 nm and 519 nm respectively, and the ratio of intensity of these two emissions will increase as the increasing of Eu^3＋. This phenomenon reveals that the distribution of probability of Eu^3＋ in different symmetrical center of ZnS crystal were affected by the concentration of Eu^3＋, and the site symmetry of Eu^3＋ reduces as the increasing of Eu^3＋. Stability of fluorescent intensity for ZnS：Eu^3＋ quantum dots was also discussed.

关 键 词：光致发光 ZnS:Eu^3+ 量子点 水相合成 

分 类 号：O472[理学—半导体物理]