采用高温固相法制备Ca1-xAl2+xSi2O8:12％(摩尔分数)Eu3荧光粉,在紫外激发下得到红色与蓝色混合系列发光材料.通过调控Ca和Al的比例,结果显示:当x=0.3,即Ca0.7 Al2.3 Si2O8∶Eu3为此发光材料的最佳比例,在λex=296 nm激发下Eu3发光强度最大,λex=319 nm激发下Eu2发光强度最大.有趣的是,在Eu3的五个特征峰中5 D0 →7 F4(682 nm)的强度在之前的研究中没有出现与5D0→7F2(614 nm)相接近,但在我们的实验中观察到在296和319 nm激发下,5D0→7 F4的发光强度与5D0 →7F2已非常接近.通过监测682 nm与614 nm处的荧光寿命分别为1.99和1.84 ms,得出它们属于一个发光中心.通过色坐标的测量,此样品在蓝光区与红光区可进行调节,因此这种材料作为白光LED中的蓝色与红色荧光粉存在潜在的应用前景.
This paper focuses on the phosphors preparation of Ca1-x Al2 +x Si2O8 ∶12％ Eu3+ by solid state reaction at high temperature.A series of red and blue light emitting materials were obtained under UV excitation by regulating Ca,Al ratio.The results are as follows,when x =0.3,the optimum ratio of luminescent materials is Ca0.7Al2.3 Si2O8 ∶ Eu3 +,the excitation of Eu3 + maximum luminescence intensity is under 296 nm,the excitation of Eu2 + maximum luminescence intensity is under 319 nm.The strength of the five characteristic peaks of 5 D0→7F4 (682 nm),which is close to 5D0→7F2 (614 nm),was not found in previous studies.But we observed that excitation under 296 and 319 nm in our experiments,5D0→7F4 (682 nm) which is close to 5D0→7F2 (614 nm).The fluorescence lifetime of 682 and 613 nm were 1.99 and 1.84 ms,respectively,both belong to a luminous center.According to the CIE chromaticity coordinates of sample,it can be adjusted in the blue and red region.Thus,the phosphors of Ca1-xAl2+xSi2O8 ∶Eu3+ has a potential application prospect on W-LED as red and blue phosphors.
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