新型结构稀土硼磷酸盐材料的设计合成及光功能研究

Exploring optical materials with high-efficiency and stability is a hot issue in the current rare earth borophosphate research. The urgent scientific problem, in order to effectively avoid concentration fluorescence quenching and acquire novel structure with specific optical function, to be resolved is how to assemble structural units BO4, BO3 and PO4. This project focuses on the structure-property relationship of new inorganic substance and aims to synthesize novel rare earth borophosphate inorganic materials with optical function. Firstly, rare earth borophosphate compounds are synthesized by the high temperature solid state reaction. In the structure, Ce, Eu, Gd or Tb………… is imported respectively, and anionic group is composed of units BO4, BO3 and PO4. Secondly, the relationship between the structural group and property regulation is researched by means of the combination of different structure determination and optical performance. Finally, the connection and arrangement of units BO4, BO3 and PO4 is regulated by theological calculation. The distance between rare earth ions is changed, and concentration fluorescence quenching is effectively avoided. According to structure optimization, rare earth borophosphate optical crystals are designed and synthesized. The project will lay a solid foundation for both structural chemistry of rare earth borophosphate and development of new optical crystalline materials.

在稀土硼磷酸盐体系中，寻找高效稳定的光功能材料是当今研究的热点。如何组装结构单元BO4、BO3和PO4，有效避免荧光淬灭效应，获得新颖结构和特定光功能，是一个亟待解决的关键科学问题。本项目着眼于无机新物质的结构与性能的关系研究，以稀土硼磷酸盐光功能材料为研究对象。首先，通过高温固相法合成结构新颖的稀土硼磷酸盐化合物，分别引入稀土元素Ce、Eu、Gd、Tb…………参与构筑结构的同时，获得由BO4、BO3和PO4相连形成的阴离子基团。然后，通过性能测试及不同晶体结构的比较分析，研究结构和光功能之间的关系。最后，通过理论计算结构优化调控结构单元BO4、BO3和PO4的连接方式及其空间排列，改变稀土离子间的距离，有效避免荧光淬灭效应，指导实验合成，高效设计制备稀土硼磷酸盐光功能晶体。本项目的开展可为稀土硼磷酸盐的结构化学研究以及新型光功能材料的开发打下坚实的基础。

按照项目计划，围绕研究目标，聚焦硼磷酸盐基质，例如碱金属硼磷酸盐Li2NaBP2O8、LiNa2B5P2O14和KNa4B2P3O13，具有类金刚石结构的碱金属-碱土金属硼磷酸盐RbBaBP2O8和KSrBP2O8，镧基硼磷酸盐La7O6(BO3)(PO4)2，研究了激活稀土离子的取代占据格位、非等价取代和等价取代等对发光特性的影响，研究了荧光浓度猝灭和热猝灭效应，以及他们的白光LED应用分析，共发表学术论文13篇，均为SCI收录。授权国家发明专利3项。