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１３０００～２１５００ｃｍ－１之间，压力至１２ＧＰａ。由光谱数据得到了Ｅｕ３＋晶场能级随压力的变化曲线。７Ｆｏ～５能级随压力的变化规律比较复杂，而５Ｄｏ～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，所得常压下的五个非零晶场参数分别为：Ｂ２０＝－１１２４．０ｃｍ－１，Ｂ４０＝－９６９．６ｃｍ－１，Ｂ４４＝８２７．９ｃｍ－１，Ｂ６０＝８８９．６ｃｍ－１，Ｂ６４＝３７７．０ｃｍ－１。高压下的计算结果表明，Ｂ４０、Ｂ６０这两个晶场参数随压力的增加而增大，Ｂ６４随压力的增加而减小，而Ｂ２０、Ｂ４４随压力的变化有些起伏。晶场强度在８ＧＰａ以下随压力增加而减小，其后开始变强。
The fluorescence spectra of GdOBr:Eu at room temperature and under high pressure up to 12GPa were measured and analyzed.43 lines were observed at ambient pressure in the wavenumber of 13000～21500cm -1 .From the fluorescence spectra,the major part of the 7 F 0～5 and all the 5 D 0～2 stark levels were determined.Under pressures,the 5 D 0～2 stark levels shift downwards,but the 7 F 0～5 stark levels shift upwards or downwards irregularly.The crystal field simulation calculation is conducted on the 49 7 F states.The five nonzero crystal field parameters obtained at ambient pressure are as follows: B 2 0=-1124.0cm -1 , B 4 0=-969.6cm -1 , B 4 4=827.9cm -1 , B 6 0=889.6cm -1 and B 6 4=377.0cm -1 .Under high pressures, B 4 0 and B 6 0 increase with pressure.While B 6 4 decreases with pressure. B 2 0 and B 4 4 show somewhat irregular variations with perssure.From the crystal field parameters,crystal field strength S was deduced.At ambient pressure, S =445.0cm -1 .Under high pressures it decreases with pressure till about 8GPa,then increases with pressure till 12GPa.
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
1996年第2期87-96,共10页
Chinese Journal of High Pressure Physics
关键词
高压
荧光谱
晶场能级
晶场参数
high pressure,fluorescence spectrum,crystal field level,crystal field parameter.
