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采用共沉淀法制备了一系列Al2 O3含量由低到高的ZrO2-Al2 O3固溶体，并研究了固溶体的晶相结构以及稀土Er3＋在固溶体中的上转换发光增强机制。XRD结果表明固溶体为四方晶相ZrO2结构，Al2 O3的最高固溶度约为20 mol％。上转换发光光谱分析表明，Er3＋掺杂ZrO2室温下具有绿色上转换荧光发射，通过共掺杂Yb3＋和M o6＋离子，使得Er3＋掺杂ZrO2的绿色上转换发光强度增强了约20倍，获得了明亮的黄绿色上转换发光。基质ZrO2通过与Al2 O3固溶形成复合氧化物，由于产生的大量氧空位缺陷的能级与Er3＋的4 F7/2能级高度相接近，增强了Yb3＋-MoO2-4基团（2 F7/2，3 T2）能级向Er3＋的4 F7/2能级的能量传递。通过形成固溶体复合氧化物基质材料，使得Er3＋的绿色上转换发光在获得20倍增强的基础上又提高了8倍。绿色与红色上转换发光比例的变化也提高了材料的色纯度，上转换发光由黄绿色变为纯绿色。“,”A series of ZrO2-Al2 O3 composites with various compositions were synthesized by co-precipitation method ,and the upconversion emission properties of the Er-Yb-Mo co-doped ZrO2-Al2 O3 composites were investigated in the present paper .The green UC emission in the Er-Yb-Mo co-doped ZrO2 is an order of magnitude stronger than that of the Er3+ single doped sample . When Al2 O3 mixed in ZrO2 crystalline lattice with the most solid solubility ,the crystalline ZrO2-Al2 O3 solid solutions is tetra-gonal ZrO2 .The UC emission is enhanced 8 times in the ZrO2-Al2 O3 solid solutions ,which is due to the oxygen vacancies gener-ated in the solid solutions ,increasing the energy transfer from Yb3+-MoO2 -4 to Er3+ .