La_6WO_(12):Eu^(3+)纳米荧光粉的合成及荧光纳米纤维膜的制备

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

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。将该荧光粉与聚乙烯醇(PVA)水溶液混合均匀,通过静电纺丝法可制得荧光纳米纤维膜,并分别采用SEM,荧光光谱和反射光谱对所得荧光纳米纤维膜进行了表征。结果表明La6WO12:Eu3+荧光纳米粉末可以复合PVA得到荧光纳米纤维膜,并可以被氮化铟镓(InGaN)或氮化镓(GaN)发光二极管有效激发而产生红色发光。

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.