Liu Chenglu, Wang Fang, Jia Peiyun, Lin Jun, Zhou Zhiqiang
School of Sciences, Northeast Forestry University, Harbin (150040), PR China.
J Nanosci Nanotechnol. 2012 Mar;12(3):1938-45. doi: 10.1166/jnn.2012.5175.
Eu3+ and Dy(3+)-doped YVO4 nanocrystallites were successfully prepared at 400 degrees C in equal moles of NaNO3 and KNO3 molten salts. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electronic microscopy (TEM), photoluminescence (PL) spectrum and lifetime were used to characterize the nanocrystallites. XRD results demonstrate that NaOH concentration and annealing temperature play important roles in phase purity and crystallinity of the nanocrystallites, the optimum NaOH concentration and annealing temperature being 6:40 and 400 degrees C respectively. TEM micrographs show the nanocrystallites are well crystallized with a cubic morphology in an average grain size of about 18 nm. Upon excitation of the vanadate group at 314 nm, YVO4:Eu3+ and YVO4:Dy3+ nanocrystallites exhibit the characteristic emission of Eu3+ and Dy3+, which indicates that there is an energy transfer from the vanadate group to the rare earth ions. Moreover, the structure and luminescent properties of the nanocrystallites were compared with their bulk counterparts with same composition in detail.
在400摄氏度下于等摩尔的硝酸钠和硝酸钾熔盐中成功制备了铕离子（Eu3+）和镝离子（Dy3+）掺杂的钒酸钇（YVO4）纳米微晶。利用X射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱、透射电子显微镜（TEM）、光致发光（PL）光谱和寿命来表征这些纳米微晶。XRD结果表明，氢氧化钠浓度和退火温度对纳米微晶的相纯度和结晶度起着重要作用，最佳氢氧化钠浓度和退火温度分别为6:40和400摄氏度。TEM显微照片显示，纳米微晶结晶良好，呈立方形态，平均晶粒尺寸约为18纳米。在314纳米处激发钒酸根基团时，YVO4:Eu3+和YVO4:Dy3+纳米微晶表现出Eu3+和Dy3+的特征发射，这表明存在从钒酸根基团到稀土离子的能量转移。此外，还详细比较了纳米微晶与其相同组成的块状材料的结构和发光性能。
