异价离子掺杂调控上转换氟化物纳米晶结构及构效关系研究

项目名称： 异价离子掺杂调控上转换氟化物纳米晶结构及构效关系研究

项目编号： No.21271170

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 陈大钦

作者单位： 中国科学院福建物质结构研究所

项目金额： 80万元

中文摘要： 近年来，上转换发光纳米晶由于在生物标记、太阳电池和固态三维显示等领域具有广阔的应用前景而受到材料学界的广泛关注。在传统的纳米晶液相合成方法中，一般是通过精细调整表面活性剂、反应溶剂、前驱物含量、反应温度与时间等条件来实现对产物显微结构的调控。本项目拟通过异价离子掺杂实现对氟化物纳米晶结构的"宽幅"调控，进而优化材料的上转换发光性能。重点研究液相反应体系中异价离子掺杂对氟化物纳米晶成核与生长过程的影响，并探明其微观机理，从而实现单分散、具有特定相结构、组分、尺度和形状的上转换氟化物纳米晶的可控合成；在此基础上，研究材料的显微结构（包括相结构、组分、尺度和形状等）对其光学性能的影响，建立构效关系，再进一步指导材料制备与结构调控，实现上转换发光性能的优化。通过项目实施，一方面可进一步丰富纳米材料合成化学和稀土光谱学，另一方面还有望开发出高量子效率的新型上转换发光纳米材料。

中文关键词： 掺杂；稀土离子；上转换；发光材料；核-壳结构

英文摘要： Recently, upconversion nanocrystals have been extensively studied inspired by their potential applications in biomedical imaging, solar cell and solid-state three-dimensional display. Conventionally, the control of nanocrystal microstructure in solution system was achieved by varying capping ligand, solvent, reactant concentration, reaction temperature and time, etc. In this project, a novel synthesis strategy (i.e., heterovalent ion doping), which involves doping of an impurity with a different valence than the cation in the nanophase, was adopted to modify the microstructure of some upconversion fluoride nanocrystals, and thus to improve their upconversion performance. The impact of heterovelent ion doping on the nucleation and growth of fluoride nanocrystals in solution system was systematically investigated, and their modification mechanisms were clarified. In this way, the controllable synthesis of monodisperse upconversion fluoride nanocrystals with specific phase structure, composition, size and shape can be achieved. Furthermore, the relationship between nanocrystal microstructure (such as phase structure, composition, size as well as shape) and upconversion properties is going to be carefully studied, which will be used to optimize upconversion properties of the synthesized fluoride nanocrystals. In a w

英文关键词： doping；rare earth ions；upconversion；luminescent materials；core-shell nanoarchitecture