中文摘要：

通过燃烧法制备了Yb^3＋ -Tm^3＋共掺的Y2O3纳米粉体，并对样品在980 nm激光照射下的上转换发光特性进行了研究．实验发现，样品在可见光区域能够产生强烈的蓝色发光（476nm和487nm）和较弱的红色发光（约650nm），而且同时观察到了两个紫外发光峰^1I6→^3H6（～297nm）和^1D2→^3H6（～363nm）．通过比较Yb^3＋离子浓度与上转换发光光谱的关系，对可能的敏化机理进行了探讨．最后，通过测量Y2O3：Yb^3＋（2％），Tm^3＋的发光强度随抽运功率的变化，得出红、蓝光为三光子过程，而363nm的紫外发光为四光子过程，并进一步验证了上转换发光机理．

英文摘要：

The Y203 ： Yb^3＋ , Tm^3＋ nanomaterials are prepared by a combustion method. The sample is excited by 980 nm, thereby producing a bright blue emission transition peak （476 nm and 487 nm） and a weak red emission peak （ about 650 nm） that can be clearly observed. More important two ultraviolet emission peaks ^1I6→^3H6（ ～ 297 nm） and ^1D2→^3H6 （ ～ 363 nm） are found. In addition, the change of upconversion emission intensity dependent on the Yb^3＋ concentrations was recorded and the possible eauses are discussed. Finally, the pump energy dependences of the emission intensity are investigated. The results show that blue and red emissions originate from a three-photon process and uhraviolet emission peak （363 nm） takes its source at a four-photon process.