均相共沉淀及凝胶燃烧法制备Yb:GGG纳米粉的比较(英文)

A COMPARISON OF PREPARATION OF Yb:GGG NANOPOWDERS BY THE HOMOGENOUS PRE-CIPITATION AND GEL COMBUSTION METHOD

用均相沉淀法和凝胶燃烧法分别合成了掺镱钆镓石榴石粉体(Yb^(3+)Gd_3Ga_5O_(12),gadolinium gallium garnet doped with ytterbium,Yb:GGG)。借助X射线衍射、透射电镜、热分析、红外光谱及荧光光谱等手段对制备粉体的结构、形貌、热分解过程及光谱特性进行对比分析。结果表明:在900℃煅烧8h后,2种方法均能获得单相立方的Yb:GGG纳米粉体。均相沉淀法及凝胶燃烧法得到的粉体平均粒径分别约为80nm和47nm。在488nm激发波长下,2种方法获得的Yb:GGG粉体的荧光光谱相似,荧光发射的最强峰位于1 027nm处,是Yb^(3+)的~2F_(7/2)→~2F_(5/2)谱相导致的荧光发射。

Gadolinium gallium garnet doped with ytterbium（Yb^3＋Gd3Ga5O12, Yb：GGG） nanopowders doped with ytterbium ions were synthesized by the homogeneous precipitation and gel combustion. The structure and the morphology, the processing of heat decomposition and the spectral characteristics of the powders were analyzed and compared by X-ray diffraction, transmission electron microscope, thermal analysis, infrared spectroscopy, and fluorescence spectra. The results show that single phase cubic Yb：GGG nanopowders are successfully synthesized by both preparation methods at 900℃ for 8 h. The average particle sizes of the powders are about 80 um （by the homogeneous precipitation method） and 47 nm （by the gel combustion method）, respectively. The Yb：GGG nanopowders obtained by these two methods show similar luminescence spectra at 488 nm. The strongest fluorescence emission peak is 1 027 nm for Yb：GGG powders; this is the fluorescence emission of 2F7/2→^2F5/2.