Eu^(3+)∶Y_2SiO_5晶体的格位选择光谱研究

Site Selective Spectrum of Eu 3+ Doped Y 2SiO 5 Crystal

在室温和液氨温度下， 测量并研究了 Ｅｕ３＋ ∶ Ｙ２ Ｓｉ Ｏ５ 晶体的透射光谱， 荧光光谱， 激发光谱和格位选择荧光光谱． 实验结果表明， 在该晶体中 Ｅｕ３＋ 替换 Ｙ３＋ 离子， 占据 ２ 个不等价的 Ｃ１ 光学格位， 这 ２ 个格位的５ Ｄ０ ７ Ｆ０ 能级跃迁谱线相隔大约只有 ０．２ ｎｍ ．并用 Ｘ 射线对晶体的晶格常数 ａ，ｂ，ｃ 和晶面角度 β进行了测量，测量结果显示掺杂后的晶格常数和未掺杂 Ｙ２ Ｓｉ Ｏ５ 的晶格常数基本一致．

The transmission spectrum,fluorescence spectrum,excitation spectrum and site selective fluorescence spectrum of the Eu 3+ ∶Y 2SiO 5 crystal were observed at room temperature and 77 K. It has been found that Eu 3+ ions occupy two kinds of the Y 3+ sites with low symmetry in this crystal. The difference of the wavelengths of the two Eu 3+ sites for 7F 0→ 5D 0 Transition is about 0.2 nm. In addition the two sites were nonequivalent optical ones at 77 K. Crystal lattice constants a,b,c, and β of Eu 3+ ∶Y 2SiO 5 were also measured by the X ray diffraction method. The results show that the lattice constants a,b, and c of the crystal doped with Eu 3+ ions are very close to those of the Y 2SiO 5,undoped crystal.