钕镱共掺钇铝石榴石纳米粉体

SYNTHESIS AND CHARACTERISTICS OF NEODYMIUM AND YTTERBIUM-DOPED YTTRIUM ALUMINUM GARNET NANO-POWDERS

采用溶胶–凝胶燃烧法,制备了钕镱共掺钇铝石榴石(Nd3+/Yb3+:YAG)透明陶瓷纳米粉体,并用热分析、X射线衍射、红外光谱、透射电镜、吸收及荧光光谱等测试方法对其结构、形貌及性能进行分析。结果表明:经900℃煅烧,Nd3+/Yb3+:YAG透明陶瓷的质量损失为49.56%,所得到的Nd3+/Yb3+:YAG纳米粉体结晶好,烧结性好,纯度较高,形状规则,粒径均匀,均在60～100nm之间。在808nm处具有较强的吸收带,对应于Nd离子4I9/2-4F7/2跃迁,有利于对808nm激光二级管泵浦光的吸收。在1064nm处,Nd3+/Yb3+:YAG的发射峰要强于Nd3+:YAG,说明在Nd3+/Yb3+:YAG中,通过[(4F3/2)Nd,(2F7/2)Yb]→[(4I9/2)Nd,(2F5/2)Yb]离子间的交叉弛豫,产生了有效的Yb3+到Nd3+的能量转移,从而实现激光的高效输出。

Nd^3＋/yb^3＋-co-doped YAG transparent ceramic nano-powders were prepared by sol-gel combustion method, and their structure, morphology and properties were also analyzed by thermogravimetric-differential thermal analysis, X-ray diffraction, trans-mission electron microscopy, infrared spectrum, absorption and fluorescence spectra. The results show that the mass loss of the powder calcined at 900℃ for 3 h is about 49.56%. Well-crystallized Nd^3＋/Yb^3＋：YAG nano-powders are obtained with higher sintering performance and purity, and the panicle shapes are regular with average diameter in the range of 60-100 nm. The nano-powder samples exhibit a stronger absorption waveband at 808 nm, corresponding to the 4^I9/2-^4F7/2 transition of Nd^3＋ ions, which is suitable to absorb 808nm laser diode source. The emission peak of the Nd^3＋/yb^3＋：YAG sample is stronger than Nd^3＋：YAG at 1064nm. The resuits illustrate that the absorption energy of Yb^3＋ ions from the LD source can be transmitted to Nd^3＋ ions based on the cross relaxation process of [（^4F3/2）Nd,（^2F7/2）Yb]→[（^4I9/2）Nd,（^2F5/2）Yb].