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粉。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、光致发光光谱(PL)等分析手段对样品的结构、形貌以及发光性能进行了表征。研究了激活剂离子物质的量之比、助剂等反应参数对NaLa(MoO_4)_2∶Dy~(3+),Eu~(3+)发光性能的影响。实验结果表明,随着Eu~(3+)在Dy~(3+),Eu~(3+)的摩尔比中逐渐增大,Dy~(3+)的发射峰逐渐减弱,而Eu~(3+)的发射峰逐渐增强,说明Dy~(3+)和Eu~(3+)之间存在能量传递。助剂的添加有助于发光强度的增强,并对色坐标有改善作用,当添加聚乙烯吡咯烷酮(PVP-40)为助剂,Dy~(3+)和Eu~(3+)的物质的量之比为1∶2时,荧光粉的色坐标(0.323,0.340)与标准的白光色坐标(0.330,0.330)接近。表明以PVP为助剂,Dy~(3+)和Eu~(3+)双掺杂的NaLa(MoO_4)_2是一种很好的近紫外光激发下的单一基质白色荧光粉。
powder. The structure, morphology and luminescent properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) The effects of the ratio of the amount of activator ionic species and the reaction parameters such as promoter on the luminescent properties of NaLa (MoO 4) 2: Dy 3+ and Eu 3+ were studied. The experimental results show that the emission peak of Dy ~ (3+) decreases with the increase of Eu ~ (3+) molar ratio in Dy ~ (3 +) and Eu ~ (3+) 3+) increased gradually, indicating that there is energy transfer between Dy ~ (3+) and Eu ~ (3+). The addition of auxiliaries contributes to the improvement of the luminescence intensity and the improvement of the color coordinates. When polyvinylpyrrolidone (PVP-40) is added as the additive, the contents of Dy 3+ and Eu 3+ When the ratio is 1: 2, the color coordinates of phosphor (0.323,0.340) are close to the standard white color coordinates (0.330,0.330). It is shown that NaLa (MoO_4) _2 doped with Dy 3+ and Eu 3+ is a good single-substrate white phosphor excited by near-UV light with PVP as an auxiliary.