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利用水热方法合成了纯度较高的六方结构的 NaGdF4，在氧气存在条件下 950℃加热处理可以使其转变为 CaF2型立方结构。在真空紫外光激发下，六方结构的 NaGdF4∶ Eu3＋中的 Gd3＋离子吸收一个光子，并将能量分两步传递给 Eu3＋离子，发生双光子发射。立方结构的 NaGdF4∶ Eu3＋中存在有一定量的氧离子取代缺陷，使 Gd3＋离子 4f-5d跃迁移到 177nm附近，这与惰性气体放电产生的真空紫外光波长一致。
The hexagonal structure of NaGdF4 with high purity was synthesized by hydrothermal method. When heated at 950 ℃ in the presence of oxygen, it can be transformed into CaF2 cubic structure. Under vacuum ultraviolet excitation, Gd3 + ions in hexagonal structure of NaGdF4: Eu3 + absorb one photon, and transfer the energy to Eu3 + ions in two steps to generate two-photon emission. In the cubic structure of NaGdF4: Eu3 +, there is a certain amount of oxygen ion substitution defect, which makes the Gf3 + ion 4f-5d transition to near 177nm, which is consistent with the vacuum ultraviolet wavelength generated by the discharge of inert gas.