State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, People's Republic of China.
Inorg Chem. 2013 Nov 18;52(22):12986-94. doi: 10.1021/ic401501t. Epub 2013 Nov 6.
Ln(3+) (Ln = Tb, Eu, Tm, Dy, Ho, Sm) nano-/microstructures with a variety of novel and well-defined morphologies, including nanospheres, nanorod bundles, and microspindles, have been prepared through a convenient modified urea-based homogeneous precipitation (UBHP) technique followed by a heat treatment. The sizes and morphologies of the YOF products could be easily modulated by changing the pH values and fluoride sources. XRD, TG-DTA, FT-IR, SEM, and TEM, as well as photoluminescence (PL) and cathodoluminescence (CL) spectra, were used to characterize the prepared samples. The YOF:Ln(3+) nanospheres show the characteristic f-f transitions of Ln(3+) (Ln = Tb, Eu, Tm, Dy, Ho, Sm) ions and give bright green, red, blue, yellow, blue-green, and yellow-orange emission, respectively, under UV light and low-voltage electron beam excitation. Furthermore, YOF:0.03Tb(3+) phosphors exhibit green luminescence with superior properties in comparison with the commercial phosphor ZnO:Zn to a degree, which is advantageous for improving display quality. Because of the simultaneous luminescence of Ln(3+) in the YOF host, the luminescence colors of YOF:Ln(3+) phosphors can be precisely adjusted by changing the doped Ln(3+) ions and corresponding concentrations, which makes these materials hold great promise for applications in field-emission displays.
采用一种简单的改进的基于尿素的均相沉淀（UBHP）技术，然后进行热处理，制备了具有各种新颖和定义明确的形态的 YOF：Ln（3+）（Ln = Tb、Eu、Tm、Dy、Ho、Sm）纳米/微米结构，包括纳米球、纳米棒束和微纺锤。通过改变 pH 值和氟源，很容易调节 YOF 产物的尺寸和形态。X 射线衍射（XRD）、热重-差热分析（TG-DTA）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）以及光致发光（PL）和阴极发光（CL）光谱用于表征制备的样品。YOF：Ln（3+）纳米球显示出 Ln（3+）（Ln = Tb、Eu、Tm、Dy、Ho、Sm）离子的特征 f-f 跃迁，分别在紫外光和低压电子束激发下发出明亮的绿色、红色、蓝色、黄色、蓝绿色和黄色橙色发射。此外，YOF：0.03Tb（3+）荧光粉表现出优于商用 ZnO：Zn 荧光粉的绿色发光性能，这有利于提高显示质量。由于 YOF 基质中 Ln（3+）的同时发光，通过改变掺杂的 Ln（3+）离子和相应的浓度，可以精确调整 YOF：Ln（3+）荧光粉的发光颜色，这使得这些材料在场发射显示器的应用中具有很大的前景。
