利用高分子网络凝胶法制备了Eu∶YAG纳米粉体, 样品的性能通过热重-差热分析、X射线衍射分析、扫描电子显微镜、透射电子显微镜、激发谱和发光光谱进行了表征。结果表明, Eu∶YAG纳米晶体的形成温度为900℃, 比固相反应法低700℃; Eu∶YAG纳米粉体呈珊瑚虫状形貌, 粒径大小为100~150nm;Eu∶YAG纳米粉体的荧光谱在594nm处出现最强发射峰, 发光强度随着Eu3+浓度从1 at.% 增加至5 at.%的过程而逐渐增强, 在浓度继续由6 at.%增加至8 at.%的过程中出现了浓度猝灭现象, 并讨论了引起该现象的机理原因。

The preparation of Eu-doped YAG nano-phosphors via the novel synthesis process based on the polyacrylamide gel method was introduced, then the samples were characterized by thermo-gravimetric analysis, differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, the excitation or emission spectroscopy. It is found that the forming temperature of Eu∶YAG nano-phosphor can be as low as 900℃, which is 700℃ lower than that of the solid-state method; Eu∶YAG nano-phosphors is of coral shape and the particle size ranges from 100 to 150nm; the photoluminescence spectrum of the Eu∶YAG nano-phosphors exhibits the strongest emission peak at 594nm, the emission intensity of which increases steadily with increasing Eu3+ concentration from 1 at.% to 5 at.%. Fluorescence quenching effect was observed with further increasing the concentration of Eu3+ from 6 at.% to 8 at.%, and also the probable mechanism of this phenomenon is discussed.