稀土掺杂上转换荧光材料在生物医学等方面应用受到人们广泛关注，但目前也存在一些关键的问题亟待解决，如上转换荧光效率的增强。为了探索解决此问题的途径，本项目以稀土 Gd3+/Yb3+/Er3+(Tm3+)掺杂的氧化物和氟化物为主要研究对象，通过对样品上转换发射谱、功率曲线、离子相关能级寿命和X射线衍射图谱的测量和分析，研究掺杂Gd3+离子对上转换荧光材料光学性能、上转换效率、结构形貌的影响。探索由于Gd3+离子的掺杂，使得Er3+(Tm3+)上转换发光强度增加的物理机制，证实Gd3+离子与Er3+(Tm3+)离子之间存在能量转换，阐明Gd3+离子能够起到一个能量存储器作用。同时分析Gd3+离子的掺杂对上转换材料形貌的影响与上转换发光强度增加之间的关系。通过本项目的研究，可以明确掺杂Gd3+离子增强上转换发光强度的机理，进一步拓展Gd3+离子的应用，为开发高效率的上转换材料提供新的途径。

The study of rare-earth doping upconversion (UC) materials has attracted a great deal of attentions, owing to the important applications in biological tissues. However, there still exists some unresolved key issues on the way to their usage, the enhancement of UC efficiency. To solve the problem, we doped Gd3+/Yb3+/Er3+(Tm3+) ions in fluoride and oxide materials. Based on the UC fluorescence emissions, the pumping power dependence of the UC emissions, luminescence lifetimes and XRD, the UC efficiency, and the structure and morphology of the materials were investigated and discussed. Furthermore, we performed the investigations on UC emission enhancement mechanisms of Er3+(Tm3+), the energy transfer between Er3+(Tm3+) and Gd3+ions. This means, Gd3+ is acting as a reservoir to store energy coming from Er3+(Tm3+). The effects of Gd3+ doping amount on the crystal structure changed the crystal field of Er3+(Tm3+), and improved the upconversion luminescent properties. Moreover, The corresponding upconversion luminescence and UV-enhanced mechanism were investigated and discussed. The research result can provide an opportunity to enhance UV emission.