表面活性剂对ZnWO4:Tb3+绿色荧光粉发光性能的影响

Effect of surfactant on the luminescence properties of ZnWO4: Tb3+ green phosphor

  • 摘要: 采用水热法合成应用于荧光灯的绿色荧光粉ZnWO4:Tb3+.通过X射线粉末衍射分析仪(XRD), 扫描电子显微镜(SEM)和荧光光谱仪, 系统考察不同表面活性剂条件下合成的ZnWO4:Tb3+绿色荧光粉.结果表明, 不同表面活性剂条件下, 采用水热法合成的产品均为纯ZnWO4结构, Tb3+掺杂并不改变钨酸锌结构; 荧光光谱仪对样品的激发和发射以及荧光衰减曲线测定表明, 表面活性剂PEG-2000条件下合成的荧光粉, 其发光强度增强最有效, 采用PVP为表面活性剂合成ZnWO4:Tb3+的荧光粉寿命较采用PEG-2000和CTAB为表面活性剂合成的长.综合发光强度和荧光寿命的影响, 选PVP为表面活性剂最佳.

     

    Abstract: Green phosphor ZnWO4:Tb3+ applied in fluorescent lamp was prepared by hydrothermal method.The structure, morphology and luminescent properties of ZnWO4:Tb3+ green phosphors with different surfactants are characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and fluorescence spectrometer, respectively.It reveals that all of the as-obtained samples with different surfactants are pure ZnWO4, Tb3+ doping without the alteration of the structure of ZnWO4.The excitation and emission spectra as well as fluorescence decay curves of samples were measured.The results show that the use of PEG-2000 as the surfactant is the most effective for increasing fluorescent emission intensity.The luminescence life of ZnWO4:Tb3+ phosphor using PVP as the surfactant is longer than that of phosphor with PEG-2000 and CTAB as surfactants.PVP is the best choice for the surfactant with comprehensive consideration of the influence of emission intensity and fluorescence lifetime.

     

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