ZnWO4∶Eu3+,Dy3+白色荧光粉的微波水热合成及其发光性能

Microwave Hydrothermal Synthesis and Luminescent Properties of ZnWO4:Eu3+,Dy3+ White Light-Emitting Phosphors

采用微波水热法快速合成了Zn0. 9975-xWO4∶0. 0025Eu3+,x Dy3+(x=0,0. 0025,0. 005,0. 01,0. 02)一系列单一基质白色荧光粉。通过X射线粉末衍射仪、扫描电镜、荧光分光光度计、光谱分析仪等对样品进行分析表征。结果表明:在180℃下仅用2 h即可合成单斜晶系黑钨矿结构的Zn WO4∶Eu3+,Dy3+纯相,且有较高的结晶度;样品颗粒为类球形,尺寸在50 nm左右。在303 nm的紫外光激发下,该荧光粉可以同时产生WO24-、Dy3+和Eu3+的特征发射,主峰分别位于472 nm、583 nm和617 nm。当样品组成为Zn WO4∶0. 0025Eu3+,0. 005Dy3+时,其色坐标为:x=0. 3359,y=0. 3064,接近理想白光,色温:5290 K。

A series of Zn 0.9975-x WO 4∶0.0025Eu 3+,x Dy 3+(x=0,0.0025,0.005,0.01,0.02)single host white light-emitting phosphors were successfully prepared by microwave hydrothermal method.The samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),fluorescence spectrophotometer and spectrum analyzer.The results show that the ZnWO 4∶Eu 3+,Dy 3+pure phase with monoclinic wolframite structure can be synthesized under the condition of 180℃/2 h.The particles of sample are approximately spherical in shape,and the particle size is about 50 nm in the diameter.Under the UV excitation of 303 nm,the phosphor generates the characteristic emissions of WO 2-4,Dy 3+and Eu 3+with the corresponding main peak located at 472 nm,583 nm and 617 nm,respectively.When the composition of the sample is ZnWO 4∶0.0025Eu 3+,0.005Dy 3+,its color coordinate is x=0.3359,y=0.3064,which is very close to the ideal white light point,and its color temperature is 5290 K.