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采用水热法,通过控制焙烧温度和PEG-1000用量制备了一系列不同发光强度的ZnWO_4荧光粉体,运用X射线粉末衍射仪、红外光谱仪、扫描电子显微镜和荧光分光光度计等对样品进行了分析和表征。结果表明:得到的ZnWO_4蓝色荧光粉均为黑钨矿纯相;水热产物为类球形小颗粒,经700℃焙烧后得到边缘清晰的短棒状结构;添加0.5 g PEG-1000且700℃焙烧后所得样品颗粒仍为短棒状结构,但其颗粒尺寸明显减小。ZnWO_4的发射光谱由一宽发射带组成,峰值位于465 nm处;水热法制备的ZnWO_4粉体经过焙烧可以提高荧光粉的结晶度和发光性能,最佳焙烧温度为700℃;表面活性剂PEG-1000的添加也使得荧光粉的发光强度明显提高,最佳用量为0.8 g。
A series of ZnWO_4 phosphors with different luminescence intensity were prepared by controlling the calcination temperature and the amount of PEG-1000 by hydrothermal method. The samples were characterized by X-ray powder diffraction, infrared spectroscopy, scanning electron microscopy and fluorescence spectrophotometer Analysis and characterization. The results show that all of the ZnWO_4 blue phosphors are pure phase of wolframite. The hydrothermal products are spheroidal small particles, which have a sharp edge and short rod-like structure after being calcined at 700 ℃. When 0.5 g PEG-1000 is calcined at 700 ℃ The resulting sample particles are still short rod-like structure, but the particle size is significantly reduced. The emission spectrum of ZnWO 4 consists of a broad emission band with the peak at 465 nm. The ZnWO 4 powder prepared by hydrothermal method can improve the crystallinity and luminescent properties of the phosphor powder. The optimal calcination temperature is 700 ℃. The surface active agent PEG The addition of -1000 also makes the luminous intensity of the phosphor significantly improved, the best dosage is 0.8 g.