相位可控的氟钪纳米晶的合成及其上转换发光性能

Phase-Controlled Synthesis of Fluoride Scandium Nanocrystals with Properties of Upconversion Luminescence

控制反应条件如表面活性剂的组成、加入量或反应时间,可以制得不同形态、相结构且具有上转换发光(UCL)的氟钪纳米晶(NCs)。改变表面活性剂油酸(OA)/油胺(OM)的比例有利于晶体结构从立方相ScF3∶Yb,Er转变为具有上转换发光性能增强的正交相KSc2F7∶Yb,Er纳米晶,而纳米晶的形态会发生从小到大的转变。改变掺杂元素的种类及含量,在980nm光激发下,KSc2F7纳米晶的上转换发光可以从蓝色变到白色,再到主要发射紫色光。

The fluorine scandium nanocrystals (NCs) with different morphologies,phase structures and properties of upconversion luminescence (UCL) were synthesized through changing the reaction conditions such as the composition,the amount of the surfactant or the reaction time.The change of the ratio of surfactant oleic acid (OA)/oleylamine (OM) made the crystal structure change from cubic ScF3∶Yb,Er to orthorhombic KSc2F7∶Yb,Er NCs with the enhanced UCL,while the morphology transformed from small to bulky.The UCL of the KSc2F7 NCs could be tuned from blue through white,and then to dominant purple emissions by changing doped element under the excitation of 980 nm laser.