纳米晶(Gd,Lu)_2O_3:Eu粉体的合成及发光性能(英文)

Synthesis and Luminescence Properties of Nanocrystalline (Gd, Lu)_2O_3:Eu Powders

通过燃烧法制备得到(Gd,Lu)203:Eu纳米粉体。利用傅里叶红外光谱仪,x射线衍射仪,高分辨透射电镜,激发和发射光谱来表征样品的结构和发光性质。结果表明,将燃烧法制备得到的粉体在800℃煅烧1h后,(Gd,Lu)203:Eu纳米粉体结晶为立方结构。通过增加硝酸盐(N)和甘氨酸(G)的摩尔比,经过煅烧的粉体颗粒的尺寸从15 nm增加到50nm,后又减小到40nm。而且发射光谱和激发光谱的性质比较依赖样品的颗粒尺寸。同时也发现,在此条件下制备得到的粉体非常适合制备(Gd,Lu)203:Eu的透明陶瓷。

Nanoscale (Gd,Lu)2O3:Eu powders were synthesized by a combustion method. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and excitation and emission spectra were employed to characterize the structures and luminescent properties of the samples. The XRD pattern indicates pure cubic structure for the as-prepared powders calcined at 800 ℃ for 1 h. With the increase of the molar ratio of nitrate (N) to glycine (G) in the combustion process, the particle size of the calcined powder increased firstly from 15 ran to 50 nm with subsequent decrease to 40 nm. Moreover, the emission and excitation spectra strongly depend on the particle sizes of samples. It is also found that this kind of powder is suitable for fabricating the (Gd,Lu)2O3:Eu transparent ceramic.