钪的氟化物纳米晶的可控合成与上转换发光调控

稀土元素由于其独特的电子结构而在照明、催化、生物医药等领域发挥着关键作用。近年来稀土纳米材料也引起了科研工作者的高度重视，但关于稀土家族17个成员中钪的研究却几乎是一片空白。钪具有最小的离子半径，又处在元素周期表中的独特位置，即第三副族的最顶端与过渡元素的最开始，这使得它的氟化物纳米晶具有不同于传统的Y/Ln的氟化物纳米晶的新颖特性。申请人课题组的研究成果证明（JACS 2012，132，8340），Yb/Er掺杂的钪的氟化物纳米晶不仅其化学组成与晶体结构对合成环境非常敏感，它的六方相纳米晶更是给出非常强的红色上转换荧光，而传统的Y/Ln的六方相纳米晶则给出强的绿光。为了加快开发钪的纳米晶的独特性能，本项目拟系统研究钪的氟化物纳米晶的可控合成、上转换发光机理及精确调控。本项目的顺利完成，不仅将填补关于钪的纳米晶的基础研究的空白，还将为全面开发钪的纳米材料的应用提供理论支持。

Due to the unique electronic structures, rare earth elements are widely used in lighting, catalysis and biomedicine. Recently rare earth-based nanomaterials have raised more and more interest, however studies on Sc-based nanomaterials are almost empty. Sc has the smallest ionic radius, it also sits in a unique position in the periodic table, i.e., the very top of the group IIIB and the very beginning of the transitional metals, which have imparted its fluoride nanocrystals novel properties. Our latest research (JACS 2012, 132, 8340) has proved that not only the chemical composition and crystal structure of Sc-based fluoride nanocrystals (doped with Yb/Er) are very sensitive to the synthetic environment, its hexagonal nanocrystals even give very strong red upconversion luminescence, while the counterparts of Y/Ln give strong green upconversion luminescence. In order to discover more unique properties of Sc-based fluoride nanocrystals, we plan to carry out systematic studies of this series of nanocrystals,the upconversion mechanism and its fine-tuning. This study will not only fill the blank of the fundamentals of Sc-based nanocrystals, it will also provide theoretical support for comprehensive exploration of Sc- and rare earth-based nanomaterials.