利用共沉淀法制备了Er3+掺杂及Er3+/Yb3+共掺杂纳米晶CaWO4发光粉体，室温下观察到Er3+的下转换和上转换特征发射。研究了不同煅烧温度、不同掺杂浓度对Er3+离子特征发射的影响。结果表明：随着煅烧温度的升高，发射强度增强；掺杂浓度的改变，导致了Er3+的浓度猝灭现象，其适宜的掺杂原子数分数为0.6%。同时观测到O-W的电荷迁移态与稀土离子之间的能量传递现象，并给出了能量传递的模型。对Er3+的上转换研究观察到：在976 nm激光激发下Yb3+对Er3+的上转换发射起到了很好的敏化作用,两个Yb3+同时将能量以共振方式传递给一个Er3+离子，Er3+ 、Yb3+共掺杂样品的绿光上转换过程展示了双光子过程。

Both Er3+ and Er3+-Yb3+ codoped CaWO4 nanocrystalline were prepared by chemical co-precipita-tion method. We characted the crystal structures and the room temperature down-conversion emission and up-conversion emission properties of samples with different doping concentrations of Er3+ and sintered at different temperatures, respectively. By comparing the influence of different sintering temperatures and doped concentrations on the characteristic emission of Er3+, it was found that the emission intensity depends on the sintering temperature. The emission intensity increases as the sintering temperature increasing. The effect of the concentration of doped Er3+ on the fluorescence emission intensity shows that the optimum concentration for the luminescence of Er3+ is 0.6％. The energy transfer was observed between the charge transfer state of O-W and the rare earth ion Er3+, and a model for explaining the energy transfer was given. By studing the upconversion emission of Er3+, it was showed that the Yb3+ can promote the upconversion emission of Er3+ under 976 nm excitation by the resonance energy transfer.