利用Dy3+激活激光晶体输出的黄光波段激光可广泛用于医疗、计量、天文等领域。但是Dy3+黄光发射4F9/2→6H13/2跃迁强度受Dy3+局域结构影响显著，使得不同晶体中Dy3+黄光发射强度差异较大。前期研究表明：钨钼酸盐晶体中Dy3+呈现出较强的黄光发射，但对其机理缺乏有效认识。本项目以理论计算和实验测定为手段，从Dy3+与配位离子间配位结构、配位数、键长、键性等方面着手，研究不同含氧酸盐晶体中Dy3+局域结构变化情况，构建Dy3+局域结构的理论计算模型；系统分析各结构因素对Dy3+黄光发射跃迁几率、荧光分支比、峰值发射截面的影响，揭示钨钼酸盐中Dy3+高强度黄光发射机理，形成Dy3+局域结构与黄光发射强度间的规律性认识，在此基础上通过成分调控改变晶体中Dy3+局域结构，设计和制备Dy3+激活高性能黄光波段激光晶体。项目的实施为实现Dy3+激活高性能黄光波段激光提供理论依据和物质基础。

Yellow laser generating from Dy3+-doped crystal can be widely used in many fields such as medical, metrology, astronomy. However, due to the difference of the Dy3+ local structure caused by the different hosts, the intensities of Dy3+ yellow emission corresponding to 4F9/2→6H13/2 the transition are significant different. Through the preliminary research, the yellow emission of Dy3+-doped in tungsten molybdate crystals are stronger than that in other crystals. But the phenomenon of strong yellow emission in Dy3+-doped tungsten molybdate crystals is still lack of effective analysis. Therefore, the local structures of Dy3+-doped different crystals including the coordination structure, coordination number, bond length between Dy3+ and the coordination ion are analyzed though theoretical calculation and experimental measurement. The theoretical calculation model is constructed to analyzing the Dy3+ local structures. And the influences of the local structures to the transition probability, fluorescence branch ratio, peak emission cross section of Dy3+ yellow emission system analyze. Then the mechanism of high-performance yellow emission can be revealed and a regular understanding between the Dy3+ local structure and yellow emission strength in different crystals can be formed. On the basis of regularity, the high performance laser crystals operating in yellow band will be designed and obtained. The results of the project has potential application prospect in high performance laser crystals operating in yellow band.