【摘要】 用溶胶 -凝胶法 (sol gel)制备了纳米荧光粉Y4Al2 O9:Eu3 + ,用X射线粉晶衍射对其进行了物相鉴定 ,表明在 90 0℃已经得到纯相的Y4Al2 O9产物 ,并用透射电镜对其进行形貌和衍射分析 ,分析结果证明得到的产物为纳米粉末态晶体 ,产物Y4Al2 O9:Eu3 + 粒径均匀 ,大致在 2 0～ 5 0nm之间 ,平均粒径为 30nm .并用荧光光度计对其荧光光谱进行了研究 ,光谱表明Eu3 + 在Y4Al2 O9晶格中占据两种不同的位置 .用λ =2 5 4nm的紫外光激发Y4Al2 O9:Eu3 + 时 ,产生两条发光谱带 ,即由于5D0 →7F1的跃迁产生在峰值λ =5 90nm处的橙色发光带 ,和5D0→7F2 跃迁在峰值λ =6 10nm处的红色发光带 .更多还原

【Abstract】 Nano fluorescent powder of Y 4Al 2O 9: Eu 3+ is synthesized by sol gel method. The XRD shows that the production prepared at 900 ℃ is pure phase Y 4Al 2O 9: Eu 3+ . Y 4Al 2O 9 powder is a nano crystal testified by BF and ED analyses of TEM. The grain diameter of Y 4Al 2O 9 ranges from 20 to 50 nm, averaged at 30 nm. The luminescent spectra show that Eu 3+ ions occupy two kinds of sites in Y 4Al 2O 9 crystal lattice, one in the strict inversion center, and the other in off lying inversion center. When excited with UV light ( λ =254 nm), Y 4Al 2O 9:Eu 3+ exhibits the orange emission band at λ =590 nm due to the 5 D 0→ 7 F 1 transition and the red emission band at λ =610 nm due to the 5 D 0→ 7 F 2 transition.更多还原