用均相沉淀法制备了纳米Y2O3:Eu3+样品。归纳了纳米Y2O3:Eu3+荧光强度降低的原因及提高途径。应用Judd-Ofelt理论从Y2O3:Eu3+的发射光谱编程计算了纳米与微米Y2O3:Eu3+的跃迁强度参数之比Ω′2/Ω2,比值均小于1,这表明纳米Y2O3:Eu3+颗粒的5D0→7F2电偶跃迁几率比微米材料小,5D0→7F2跃迁几率小则612nm的荧光强度低。因此纳米YO:Eu3+颗粒的荧光强度较微米材料低。 Nano-Y2O3: Eu3 + samples were prepared by homogeneous precipitation method. The reason why the fluorescence intensity of nano-Y2O3: Eu3 + is decreased and the ways to improve it are summarized. The Judd-Ofelt theory was used to calculate the ratio of Ω ’2 / Ω2, which is the ratio of the transition strength between nanosize and micron Y2O3: Eu3 +, to the emission spectra of Y2O3: Eu3 +, all of which were less than 1. This indicates that the 5D0 → 7F2 The probability of even transition is smaller than the material of micron, and the fluorescence intensity of 612 nm is low when the probability of 5D0 → 7F2 transition is small. Therefore, the fluorescence intensity of nano-YO: Eu3 + particles is lower than that of micro-materials.