压力对GdoBr:Eu晶场参数的影响

李宏年; 池元斌; 王立中; 刘慎新

doi:10.11858/gywlxb.1996.02.002

压力对GdoBr:Eu晶场参数的影响

doi: 10.11858/gywlxb.1996.02.002

1.
浙江大学物理系，浙江杭州 310027；
2.
吉林大学超材料国家重点实验室，吉林长春 130023；
3.
中国科学院长春物理研究所，吉林长春 130021

详细信息

通讯作者:
李宏年

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出版历程
- 收稿日期: 1995-05-03
- 修回日期: 1995-11-27
- 发布日期: 1996-06-05

Influence of High Pressure on Crystal Field Parameters for GdOBr:Er

1.
Department of Physics, Zhejiang University, Hangzhou 310027, China;
2.
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130023, China;
3.
Changchun Institute of Physics, Academia Sinica, Changchun 130021, China

More Information

Corresponding author: LI Hong-Nian

摘要

摘要: 在室温下测量了GdoBr:Eu的常压和高压荧光谱，光谱范围在13 000~21 500 cm-1之间，压力至12 GPa。由光谱数据得到了Eu3+晶场能级随压力的变化曲线。7F0～5能级随压力的变化规律比较复杂，而5D0~2各能均随压力的升高几乎线性地降低。在基态谱项7F的49个状态上进行了晶场拟合计算，所得常压下的5个非零晶场参数分别为：B02＝-1 124.0 cm-1，B04＝-969.6 cm-1，B44＝827.9 cm-1，B06＝889.6 cm-1，B46＝377.0 cm-1。高压下的计算结果表明，B04、B06这两个晶场参数随压力的增加而增大，B46随压力的增加而减小，而B02、B44随压力的变化有些起伏。晶场强度在8 GPa以下随压力增加而减小，其后开始变强。
- 高压荧光谱 /
- 晶场能级 /
- 晶场参数
Abstract: The fluorescence spectra of GdOBr:Eu at room temperature and under high pressure up to 12 GPa were measured and analyzed. 43 lines were observed at ambient pressure in the wavenumber of 13 000～21 500 cm-1. From the fluorescence spectra, the major part of the 7F0～5 and all the 5D0~2 stark levels were determined. Under pressures, the 5D0~2 stark levels shift downwards, but the 7F0～5 stark levels shift upwards or downwards irregularly. The crystal field simulation calculation is conducted on the 49 7F states. The five nonzero crystal field parameters obtained at ambient pressure are as follows: B02=-1 124.0 cm-1, B04=-969.6 cm-1, B44=827.9 cm-1, B06=889.6 cm-1 and B46=377.0 cm-1. Under high pressures, B04 and B06 increase with pressure. While B46 decreases with pressure, B02 and B44 show somewhat irregular variations with perssure. From the crystal field parameters, crystal field strength S was deduced. At ambient pressure, S =445.0 cm-1. Under high pressures it decreases with pressure till about 8 GPa, then increases with pressure till 12 GPa.
- high pressure /
- fluorescence spectrum /
- crystal field level