Lin Kuo-Min, Lin Chih-Cheng, Li Yuan-Yao
Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 621, Taiwan, Republic of China.
Nanotechnology. 2006 Mar 28;17(6):1745-51. doi: 10.1088/0957-4484/17/6/034. Epub 2006 Mar 3.
Gd2O3:Eu(3+) and Gd2Ti2O7:Eu(3+) films 10 nm in thickness were individually coated onto silica spheres (particle size of 150-170 nm) using the sol-gel method. The synthesized materials were addressed as Gd2O3:Eu(3+)@SiO2 and Gd2Ti2O7:Eu(3+)@SiO2 phosphors. An x-ray powder diffractometer (XRD), field emission scanning electron microscope (FE-SEM), high-resolution transmission electron microscope (HR-TEM), and photoluminescence spectrophotometer (PL) were employed to characterize the core-shell phosphors. Uniform core-shell phosphor particles were observed using FE-SEM. The XRD and HR-TEM results indicated that the coated-shell layer was well crystallized after sintering at 1000 °C. The Gd2O3:Eu(3+)@SiO2 PL measurement showed a red emission at the main 615 nm wavelength. The Gd2Ti2O7:Eu(3+)@SiO2 phosphor showed an orange-red emission at the 588 and 615 nm wavelengths. In comparison with the Gd2O3:Eu(3+) and Gd2Ti2O7:Eu(3+) bulk material results, the core-shell phosphors maintained the same emission ability as the bulk materials and the novel core-shell phosphors possessed great potential in quantum phosphor applications.
采用溶胶 - 凝胶法将厚度为10 nm的Gd2O3:Eu(3+)和Gd2Ti2O7:Eu(3+)薄膜分别涂覆在二氧化硅球体（粒径为150 - 170 nm）上。合成的材料分别称为Gd2O3:Eu(3+)@SiO2和Gd2Ti2O7:Eu(3+)@SiO2荧光粉。使用X射线粉末衍射仪（XRD）、场发射扫描电子显微镜（FE - SEM）、高分辨率透射电子显微镜（HR - TEM）和光致发光分光光度计（PL）对核壳结构荧光粉进行表征。通过FE - SEM观察到均匀的核壳结构荧光粉颗粒。XRD和HR - TEM结果表明，在1000 °C烧结后，包覆壳层结晶良好。Gd2O3:Eu(3+)@SiO2的PL测量显示在主要波长615 nm处有红色发射。Gd2Ti2O7:Eu(3+)@SiO2荧光粉在588和615 nm波长处显示橙红色发射。与Gd2O3:Eu(3+)和Gd2Ti2O7:Eu(3+)体材料的结果相比，核壳结构荧光粉保持了与体材料相同的发射能力，并且这种新型核壳结构荧光粉在量子荧光粉应用中具有巨大潜力。
