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在不添加助剂的条件下,用微波共沉淀法法制备了铕、铽(Eu~(3+)、Tb~(3+))共掺杂的钨酸钙(CaWO_4)荧光粉。利用X射线衍射(XRD)、场发射扫描电子显微镜(SEM)、荧光光谱(PL)等表征手段,对荧光粉的物相组成、形貌和发光性能进行了分析。研究了Eu~(3+)、Tb~(3+)的掺杂比例及总掺杂量、反应温度及反应物浓度对荧光性能的影响。结果表明,Eu~(3+)、Tb~(3+)的掺杂摩尔比例、总掺杂量、温度以及反应物浓度对荧光粉的发光性能均能产生影响,其中在温度为80℃、反应物浓度为0.12mol/L且Eu~(3+)和Tb~(3+)总物质的量比金属离子总物质的量为13.1%时,得到的Eu~(3+)、Tb~(3+)共掺荧光粉在256nm激发下发射光谱色坐标为(0.270,0.236),位冷白光区。
Eu (Ca3 +), Tb3 + (Tb3 +) codoped calcium tungstate (CaWO4) phosphors were prepared by microwave coprecipitation method without adding auxiliaries. The phase composition, morphology and luminescent properties of the phosphors were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM) and fluorescence spectroscopy (PL) The effects of doping ratio of Eu ~ (3 +), Tb ~ (3 +), total doping amount, reaction temperature and reactant concentration on the fluorescence properties were studied. The results show that the doping molar ratio, the total doping amount, the temperature and the reactant concentration of Eu ~ (3 +) and Tb ~ (3+) all affect the luminescent properties of the phosphors. At 80 ℃, Eu 3+ and Tb 4+ were obtained when the concentration of reactants was 0.12 mol / L and the total amount of Eu 3+ and Tb 3+ was 13.1% 3+) co-doped phosphor excited at 256nm emission spectrum color coordinates (0.270,0.236), bit cool white area.