Mn:ZnSe/ZnS核-壳结构纳米晶的无膦法制备和光学性质  

Phosphine-free synthesis and optical properties of Mn:ZnSe/ZnS core/shell nanocrystals

作　　者：申怀彬[1] 赵慧玲[2] 王洪哲[2] 刘成柏[1] 邢茗[1] 齐晓娟[1] 李林松[2] 陈霞[1] 

机构地区：[1]吉林大学生命科学学院,长春130021 [2]河南大学特种功能材料教育部重点实验室,开封475004

出　　处：《中国科学：化学》2011年第5期834-839,共6页SCIENTIA SINICA Chimica

基　　金：河南省创新型科技人才队伍建设工程(084200510013);教育部留学回国人员科研启动基金(2008-890)资助

摘　　要：以溶于十八烯的Se作为Se前驱体,在无膦条件下制备得到了具有较高量子产率的Mn:ZnSe纳米晶.为了进一步提高纳米晶的稳定性和发光强度,运用外延生长的方法进行ZnS壳层包覆并得到了具有核-壳结构的Mn:ZnSe/ZnS纳米晶.X射线衍射、透射电子显微镜及吸收和荧光光谱测试结果表明,该方法合成的Mn:ZnSe纳米晶以及核-壳结构Mn:ZnSe/ZnS纳米晶均为闪锌矿结构,具有良好的单分散性,包覆ZnS外壳层后量子产率可达到60%以上.此外,对ZnS壳层厚度和Mn2+的掺杂量对Mn:ZnSe/ZnS纳米晶发光强度的影响及发光机制也进行了初步讨论.High quality Mn：ZnSe/ZnSe nanocrystals were successfully synthesized using an environmentally friendly method. Selenium powder was dissolved directly into octadecene to form Se precursor without the assistance of phosphine complexes. To improve the quantum yield （QY） and stability of as-synthesized nanocrystals, ZnS shell was introduced by epitaxy growth technique to form Mn：ZnSe/ZnS core-shell nanocrystals. Absorption spectroscopy, photoluminescence （PL） spectroscopy, X-ray diffaraction, and transmission electron microscopy were used to characterize the property and structure of as-synthesized nanocrystals. The results demonstrated that both Mn：ZnSe and Mn：ZnSe/ZnS have a good monodispersity with cubic zinc blende structures. The PL QY of as-synthesized Mn：ZnSe/ZnS nanocrystals could reach as high as 60%. The fundamental mechanism and effects of ZnS shell thickness and Mn2＋ dopant concentration on the PL emission were also discussed preliminarily.

关 键 词：无膦法 纳米晶 Mn:ZnSe/ZnS 发光性质 

分 类 号：TB383.1[一般工业技术—材料科学与工程]