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以柠檬酸为燃烧剂,采用低温燃烧法制备Dy:Yb3Al5O12(Dy∶YbAG)荧光粉。通过不同煅烧温度下样品的X射线衍射和扫描电子显微镜分析,确定最佳煅烧温度为900℃。测试了室温下样品的激发光谱和发射光谱。结果表明:在359nm处激发峰最强,对应Dy3+的6 H15/2→6 P7/2能级跃迁;在486、587nm发射峰处得到了蓝光和黄光,分别对应Dy3+的4 F9/2→6 H1 5/2和4 F9/2→6 H1 3/2能级跃迁。计算了不同Dy3+摩尔分数掺杂的Dy∶YbAG的黄蓝光强度比,讨论了其对荧光粉发光颜色的影响,结果显示,当Dy3+掺杂摩尔分数为2%时,制备的2%Dy∶YbAG样品的发光性能最好。
Using citric acid as a combustion agent, Dy: Yb3Al5O12 (Dy: YbAG) phosphor was prepared by low temperature combustion method. Through the X-ray diffraction and scanning electron microscopy analysis of the samples at different calcination temperatures, the optimal calcination temperature was 900 ℃. The excitation and emission spectra of the samples were tested at room temperature. The results show that the excitation peak is the strongest at 359 nm, which corresponds to the 6 H15 / 2 → 6 P7 / 2 transition of Dy3 +. The blue and yellow light are obtained at the emission peak of 486 and 587 nm, corresponding to 4 F9 / 2 of Dy3 + 6 H1 5/2 and 4 F9 / 2 → 6 H1 3/2 transitions. The yellow-blue intensity ratios of Dy: YbAG doped with different Dy3 + molar fractions were calculated and their effects on the luminescent color of the phosphors were discussed. The results showed that when the mole fraction of Dy3 + doping is 2%, the ratio of Dy: YbAG The best luminescence performance of the sample.