Gong Guo, Xie Shaowen, Song Ya, Tan Haihu, Xu Jianxiong, Zhang Changfan, Xu Lijian
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, P. R. China.
College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, P. R. China.
J Nanosci Nanotechnol. 2018 Dec 1;18(12):8207-8215. doi: 10.1166/jnn.2018.15801.
Well-defined and mono-dispersed lanthanide-ion-doped NaYF4 up-conversion nanoparticles (UCNPs) were synthesized via thermal decomposition using lanthanide oleate as the precursor. By rational selecting the dopant pairs of the doped lanthanide ions (Y3+, Yb3+, Er3+ and Tm3+) with accurate molar ratios, three-primary-color (RGB) UCNPs which exhibited green (UCNPs-G), blue (UCNPs-B) and red (UCNPs-R) fluorescence, respectively, were prepared. The X-ray diffraction (XRD) patterns showed that the three UCNPs were purely hexagonal-phase NaYF4 crystals. Transmission electron microscopy (TEM) images revealed that the synthesized UCNPs exhibited well-defined nanosphere morphology with uniform size distribution. The average diameters were 23.95±3.35 nm for UCNPs-G, 20.63±2.59 nm for UCNPs-B, and 19.24±2.37 nm for UCNPs-R, respectively. After surface modification employing polyacrylic acid (PAA) as modifier, the obtained UCNPs were converted to be hydrophilic, which can be used as fillers to construct luminescent polymer films and luminescent ink in anti-counterfeiting application.
通过热分解法，以油酸镧为前驱体，合成了定义明确且单分散的镧系离子掺杂的NaYF4上转换纳米粒子（UCNPs）。通过合理选择掺杂镧系离子（Y3+、Yb3+、Er3+和Tm3+）的掺杂对，并精确控制其摩尔比，制备了分别发出绿色（UCNPs-G）、蓝色（UCNPs-B）和红色（UCNPs-R）荧光的三基色UCNPs。X射线衍射（XRD）图谱表明，这三种UCNPs均为纯六方相NaYF4晶体。透射电子显微镜（TEM）图像显示，合成的UCNPs呈现出定义明确的纳米球形态，尺寸分布均匀。UCNPs-G的平均直径为23.95±3.35 nm，UCNPs-B的平均直径为20.63±2.59 nm，UCNPs-R的平均直径为19.24±2.37 nm。采用聚丙烯酸（PAA）作为改性剂进行表面改性后，所得UCNPs转变为亲水性，可作为填料用于构建发光聚合物薄膜和防伪应用中的发光油墨。
