Synthesis and luminescence properties of nanocrystalline Gd_3Ga_5O_(12):Eu^(3+) by a homogeneous precipitation method  

作　　者：Li Yanhong Lu Haiyan Zhang Yongming Ma Jing Song Guoyi 

机构地区：[1]Shenyang Univ Chem Technol, Sch Mat Sci & Engn, Shenyang 110142, Peoples R China

出　　处：《Rare Metals》2012年第6期599-603,共5页稀有金属（英文版）

基　　金：financially supported by the Science and Technology Research Project of Department of Education of Liaoning Province,China(No.L2011063)

摘　　要：Nanocrystalline Gd3Ga5O12:Eu3+ with cubic phase was prepared by a urea homogeneous precipitation method. X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric and differential thermal analysis (TG-DTA) and photoluminescence spectra were used to characterize the samples. The effects of the initial solution pH value and urea content on the structure of the sample were studied. The XRD results show that pure phase Gd3Ga5O12 can be obtained at pH =6 and pH =8 of the initial solution. The average crystallite size can be calculated as in the range of 24~33 nm. The average crystallite size decreases with increasing molar ratio of urea to metal ion. The results of excitation spectra and emission spectra show that the emission peaks are ascribed to 5D0→7FJ transitions of Eu3+, and the magnetic dipole transition originated from 5D0 →7F1 of Eu3+ is the strongest; the broad excitation bands belong to change transfer band of Eu?O and the host absorption of Gd3Ga5O12. An efficient energy transfer occurs from Gd3+ to Eu3+.

关 键 词：Gd3Ga5O12:Eu3+ nanocrystal urea homogeneous precipitation method LUMINESCENCE 

分 类 号：TB3[一般工业技术—材料科学与工程]