La2O3对Yb:Y2O3透明陶瓷光谱性能的影响

研究了La₂O₃对Yb：Y₂O₃透明陶瓷光谱性能的影响，添加适量La₂O₃以后，Yb：Y₂O₃透明陶瓷的吸收峰和发射峰的位置不变，但由于La³⁺的离子半径大于Y³⁺的离子半径，在Y₂O₃中引入La³⁺离子后，导致Y₂O₃晶格常数变大，晶场强度变弱，同时降低了Y₂O₃晶体的有序度，致使发射峰强度有所下降，发射截面变小.过量的La₂O₃（x=0.16）造成Yb³⁺激活离子发射强度明显下降；其荧光寿命在添加La₂O₃后总体增大45%—60%. 关键词： 氧化镧 氧化钇 透明陶瓷 光谱性能

Effect of La2O3 doping on the spectroscopic properties of transparent Yb:Y2O3 laser ceramics

The effect of La₂O₃ doping on the spectroscopic properties of transparent Yb：Y₂O₃ ceramics was studied. After doping La₂O₃，the shapes and positions of the absorption and emission peaks of transparent (Yb_0.05Y_0.95-xLa_x)₂O₃ ceramics were almost the same as those of Yb：Y₂O₃. When La₂O₃ was added into Yb：Y₂O₃，the lattice constant of (Yb_0.05Y_0.95-xLa_x)₂O₃ became large and the crystal field strength weaker due to introducing of larger radius of La³⁺ ion, simultaneously its degree of order is decreased, which results in the decrease of the emission intensities and the emission cross-sections. The emission intensities were reduced greatly for the excessive doping of La₂O₃ (16at%) in (Yb_0.05Y_0.95-xLa_x)₂O₃ ceramics. On the whole the fluorescent lifetimes of the samples are increased by 45%—60% after doping La₂O₃.