摘要
采用低温燃烧合成法制备了Gd2O3∶Eu3+纳米晶。用X射线衍射仪(XRD)、高分辨透射电子显微镜(HRTEM)和荧光光谱仪分别对样品的结构、形貌和发光性能进行了研究。结果表明,改变甘氨酸与稀土离子的比例(G/M)、退火温度可以制备出不同结构和晶粒尺寸的Gd2O3∶Eu3+纳米晶。在退火温度为800℃,G/M等于0.83和1.0时,均得到了纯立方相的Gd2O3∶Eu3+纳米晶,随着G/M的增加,Gd2O3∶Eu3+从立方相逐渐向单斜相转变。粉末的晶粒尺寸随着退火温度的增高而增大,晶粒尺寸在10~30 nm之间。立方相的Gd2O3∶Eu3+纳米晶主发射峰位置在612 nm(5D0→7F2跃迁),激发光谱中电荷迁移态发生了红移。
Nanocrystalline Gd2O3 doped with europium was synthesized by the low-temperature combustion method, By using the X-ray diffraction （XRD）, high resolution transmission electron microscopy（HRTEM）, and fluorescence spectrophotometer, the structural, morphological and luminescence properties of the nanocrystal were investigated. The results show that by varying the glycine-to-metal nitrate （G/M） molar ratio and the annealing temperature, nanocrystalline Gd2O3：Eu^3＋ with different structure and grain size could be achieved. The structure changed from cubic to monoclinic with the increment of G/M ratio after the samples had been calcined at 800 ℃ for 0.5 hour, When the G/M ratio was 0.83 and 1, 0, the nanosized and pure cubic phase Gd2O3：Eu^3＋ was produced. The crystalline size became bigger with increasing the annealing temperature. The grain size was about 10-30 nm. The main emission peak in cubic Gd2O3：Eu^3＋ anocrystal was at 612 nm（the ^5D^0→^7F2 transition）. In addition, a red shift for charge transfer state occurred in the excitation spectrum.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期427-431,共5页
Spectroscopy and Spectral Analysis
基金
高等学校博士学科点专项科研基金(20050532013)资助项目
