La6WO12：Eu3+纳米荧光粉的合成及荧光纳米纤维膜的制备

采用Pechini法合成了La6WO12:Eu3+纳米荧光粉.分别用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、热重分析(TG-DTG)、反射光谱,荧光光谱和发光衰减曲线对样品进行了表征.该荧光粉可以被395nm的近紫外光有效激发,进而得到峰值波长位于615 nm(电偶极跃迁5D0→7F2)左右的红光发射.将该...

Preparation and Luminescence Properties of La_6WO_(12):Eu~(3+)/PVA Nanofibers by Pechini/Electrospinning Process

The 20% concentrated Eu³⁺-doped red-emitting phosphor, nano-sized La₆WO₁₂ ∶ Eu³⁺ was prepared by the Pechini method. X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), scanning electron microscopy (SEM), fluorescence spectrum, diffuse reflectance spectrum and decay curves were used to characterize the resulting samples. The phosphor can be efficiently excited by near UV light and exhibits an intense red luminescence corresponding to the electric dipole transition ⁵D₀→⁷F₂ at 615 nm. When the phosphor was mixed into poly (vinyl alcohol) aqueous solution, the fluorescent nanofibers could be prepared by electrospinning process. It was suggested that the La₆WO₁₂ ∶ Eu³⁺ phosphor would be a promising red component for solid-state lighting devices based on InGaN or GaN white-light-emitting diodes.