掺Eu^(3+)离子Y_2SiO_5晶体格位选择光谱研究  

Site Selective Spectra of Eu^(3+) Doped Y_2SiO_5 Crystal

作　　者：薛绍林[1] 陈凌冰[1] 谢黎明 李富铭[1] 张守都[2] 黄浩炳[2] 

机构地区：[1]复旦大学三束改性国家重点实验室,上海200433 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国稀土学报》1999年第4期369-372,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金!资助项目(69807001;69587002)

摘　　要：分别利用白光灯、４５７－９ ｎｍ 氩离子激光、二倍频ＹＡＧ∶Ｎｄ 激光泵浦的诺丹明６Ｇ 可调谐窄线宽（０－５ ｃｍ －１） 染料激光作为光源， 以单色仪锁相放大器光电倍增管计算机数据采集系统记录光谱， 测量并研究了Ｙ２ＳｉＯ５∶Ｅｕ３ ＋ 晶体的透射光谱、荧光光谱、激发光谱和格位选择荧光光谱。５Ｄ０ →７Ｆ０，１ ，２ ，３，４ 跃迁，３０ 多根谱线（总数为５０ 根） 被观察到。在该晶体中Ｅｕ３＋ 替换Ｙ３＋ 离子， 占据两个较低对称性的光学格位， 这两个格位的５Ｄ０ ７Ｆ０ 能级跃迁谱线相隔大约只有０－２ ｎｍ ， 在室温下有一定的光谱关联。并用Ｘ射线谱对晶体的晶格常数ａ ， ｂ，ｃ 和晶面角度β进行测量， 测量结果显示掺杂后的晶格常数和未掺杂的Ｙ２ＳｉＯ５ 晶格常数基本一致。By using a white light lamp, an Ar + ion laser whose wavelength was tuned to 457.9 nm and a tunable Rh 6G dye laser(linewidth: 0 5 cm -1 ) pumped by the second harmonic of a Nd∶YAG laser as light sources and using a monochromator, a phase locking amplifier and a computer as the data detecting system, the transmission spectrum, fluorescence spectra, excitation spectrum and site selective fluorescence spectra of the Eu 3+ ∶Y 2SiO 5 crystal were observed. More than thirty out of the total fifty spectral lines were observed for 5 D 0→ 7F 0,1,2,3,4 transitions. The Eu 3+ ions occupy two kinds of the Y 3+ sites with the low symmetry in this crystal. The difference of the wavelengths of the two Eu 3+ sites for 7 F 0→ 5D 0 transition is about 0 2 nm. We found that the two site are nonequivalent optical ones at room temperature. Crystal lattice constants a, b, c and β of Eu 3+ ∶Y 2SiO 5 are also measured by the X ray diffraction method. The results show that the lattice constants a, b, and c of the crystal doped Eu 3+ ions is very close to those of the Y 2SiO 5 crystal undoped Eu 3+ ions.

关 键 词：Y2SIO5 激发光谱 荧光光谱 铕离子 晶体 

分 类 号：O734[理学—晶体学] O614.322