硼酸铝钕[NdAl_3(BO_3)_4]晶体的晶场能级与发光特性

Crystal-field energy levels and fluorescent characteristic of crystal NdAl_3(BO_3)_4

本文利用晶场理论分析了NdAl_3(BO_3)晶体的光谱特性和相应的能级结构。计算出该晶体的晶场参数,并由此得到了在晶场作用下4~F_(3/2),4~I_(11/2)和4~I_(9/2)三个谱项的所有斯塔克(Stark)子能级的本征波函数。利用所得的波函数和荧光分支比的实验值,用Judd-Ofelt理论估算了4~F_(3/2)→4~I_(11/2)的子能级间跃迁几率的相对值,并讨论了相应的偏振特性,较好地说明了激光和荧光实验的结果。

Spectral oharaoteristios and energy structure of crystal NdAl3 (BO3) 4 have been analyed by the crystal-field theory to calculate its crystal-field parameters. By using these parameters, the stark sub-level wave-functions of 4F3/2, 4I11/2 and 4I9/2 manifolds have been obtained. Based on Judd-Ofelt theory, the relative transition probabilities of 4F3/2 to 4I11/2 manifolds have been calculated approximately by means of experimental data of fluorescent braching ratio, and the palorization of these transitions is discussed. In this way, the experimental results of fluorescence and laser emission can be well explained.