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Eu^3＋掺杂CaWO4红色荧光粉发光性质的浓度依赖关系研究
Study of concentration dependence of luminescent properties for Eu3＋ doped CaWO4 red phosphors
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摘要: 采用共沉淀法制备了不同Eu^3＋掺杂浓度的CaWO4荧光粉材料．通过X射线衍射和场发射扫描电镜技术对样品的结构和形貌进行了表征．测量了各样品的激发光谱、发射光谱和荧光衰减曲线，计算了各样品的部分Judd—Oflet（J．O）参数和0D0（Eu^3＋）能级量子效率，以及荧光粉的色坐标，讨论了样品电荷迁移带相对强度、J-O参数、量子效率与掺杂浓度的依赖关系．对Eu3＋掺杂的CaWO4发光材料的光致发光性质的研究表明，在CaWO4：Eu^3＋中5^Do→7^F2跃迁的616nm红色发光能被394．5nm和465nm的激发光有效激发，具有近紫外（或蓝光）激发效率高和猝灭浓度大的优点，有潜力成为高效的近紫外（或蓝光）激发白光发光二极管用红色荧光粉材料．Abstract: Eu^3＋ doped CaWO4 phosphors of different concentrations are prepared by a co-precipitation method. The X-ray diffraction patterns and field emission scanning electron microscopy images are investigated. The excitation spectra, emission spectra and the curves of fluorescence decays of the samples are measured. The Judd-Ofelt （J-O） parameters, quantum efficiencies of the 5^Do level of Eu^3＋ and color coordinates are calculated. The dependences of relative intensity of charge transfer band, J-O parameter and quantum efficiency on doping concentration are discussed. The photoluminescence properties of Eu^3＋ doped CaWO4 luminescent material are studied. The results indicate that the 616 nm red emission of Eu3＋→5Do→7^F2 transition can be effectively excited by 394.5 nm and 465 nm with high excitation efficiency and the concentration quenching is high. So the CaWO4： Eu red phosphor may have a potential application for white light emitting diode.
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