| NaGdF4:Eu3+的结构和VUV荧光性质 |
| Structural and VUV Luminescent Properties of NaGdF4: Eu3+ |
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| 摘要: 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。 |
| 关键词: 稀土离子 氟化物 真空紫外 双光子发射 |
| 基金项目: 国家自然科学基金委员会(No.29731010);国家重点基础研究规划项目(973项目);国家杰出青年基金资助. |
| Abstract: Hexagonal NaGdF4 was prepared by hydrothermal synthesis, which converts to the fluorite structure by heating at 950℃ in air. However, the structure does not change after heat treatment at 950℃ in argon atmosphere, indicating that oxygen atoms place a role in the structure transformation. The Eu3+ doped hexagonal NaGdF4 shows quantum cutting effect that involves two visible emission photons for each vacuum ultraviolet photon absorbed. Upon VUV excitation to the 6GJ level of Cd3+, two red photons are emitted by Eu3+ through an efficient two-step energy transfer process. The quantum efficiency of this material is about 160% . Cubic NaGdF4 contains considerable amount of oxygen impurity, so that the 4f- 5d transition moves to lower energy(177nm), which fits the energy of the VUVphotons from discharge of inert gas. |
| Keywords: rare earth fluorides vacuum ultraviolet(VUV) quantum cutting |
| 投稿时间：2000-09-18 修订日期：2000-11-08 |
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| 由芳田,王颖霞,林建华,陶冶.NaGdF4:Eu3+的结构和VUV荧光性质[J].无机化学学报,2001,17(1):27-31. |
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