压力对硼酸盐纳米材料的结构和光学性质调控研究

The properties of borate nanomaterials are strongly related with their sizes and dimensions, which determine the atomic structure and electronic state of nano-systems. By modulating the structrue, size, dimensions and morphologies of nanomaterials with high pressure technique, we can not only study the influence of pressure on both crystal structure and optical properties of the material, but also explore novel materials. In this project, using in situ high presusre techniques, we study the effect of borate nanomaterials' size, morphology, surface energy, doping on the structural phase transition and optical properties under high pressure. We explore the mechanism of structural phase transition and optical properties to determine hgih pressure structure and stable conditions, to establish the relation between high-pressure structure and excellent optical propeties. From the studies of the project, it can provide technical and theoretical support for the applications of borate nanomaterials and the design of new functional materials.

硼酸盐纳米材料的发光性质与其尺寸、维度、形貌密切相关，它们决定着纳米体系的原子结构以及相应的电子状态。利用高压技术对硼酸盐纳米材料的结构、尺寸、维度、形貌的调控，既可以探究压力对材料的结构、发光性质的影响，又有助于开发具有新颖特性的新材料。本项目采用原位高压实验技术，研究硼酸盐纳米材料的尺寸、形貌、表面能、掺杂对其高压下结构相变和光学性能的影响，探索高压结构相变和光学性能的变化机制，确定高压相的结构和稳定条件，建立高压相和优良光学性质的联系。通过本项目研究，为硼酸盐纳米材料的应用和新型功能材料的设计提供科学依据和理论指导。

温度、压力可有效地调制材料的微观结构与宏观性质，是改善材料性能、寻找新材料的极为快捷、有效手段。项目主要研究稀土掺杂硼酸盐、钒酸盐和钼酸盐等荧光粉的结构与光学性质。系统研究了材料基质结构、组成成分、发光强度、能量传递通道与机制。利用温度、压力来有效调制材料的晶体结构、晶体场、稀土离子激发态，实现对荧光粉的发光强度及色纯度的有效改善。建立了荧光材料的成分-结构-发光性能的构效关系及白光的匹配耦合规律，封装了近紫外光激发荧光粉的白光LED器件。发表学术论文11篇。