本课题针对目前钨钼酸盐负热膨胀材料微纳米化困难、结构探测手段单一、热缩机制不明确等问题，选择A2M3O12（A=Ln3+，M=W/Mo）型化合物为研究主体，采用软化学制备方法致力于基于稀土离子高灵敏光学跃迁的结构探针设计、光物理及热缩机制研究。依据晶体场理论和分子轨道理论对A、M格位进行组分的选择性调整和探针离子的定向引入，准确分析温度变化对稀土探针离子的光学特性的影响，从共价性、电子云密度、极化率及化学键有效价电子数等角度讨论键长、键角、对称性等晶体场参数的变化在负热膨胀特性中扮演的角色，阐释随温度升高晶格收缩的详细物理过程，为热缩机理的完善和新观点的提出提供科学数据。

Nowadays, negative thermal expansion materials have some shortcomings of single structural detection means and unclear mechanism. Based on crystal field theory and molecular orbital theory, this project aims to synthesis ultrasensitive fluorescent probe ions doped A2M3O12 micro/nano materials through soft chemical method. It is desired to explore the subtle relationship between their properties and structure by introducing the doping ions into the purpose sites. With the variation of the temperature, the change rules of luminescence, negative thermal expansion coefficient and electronic density microstructure will be analyzed. Based on the above work, the mechanisms on negative thermal expansion will be discussed in detail. And on this basis, we further try to develop an effective mean of luminescence amplification by the modulation and combination of pump photosources and physics simulation. We expect to be able to enrich the photophysical mechanism and provide some scientific data and theoretic guidance.