摘要
测量和分析了不同温度下Eu3 + :ThO2 的激发光谱、发射光谱和荧光衰减曲线 .Eu3 + :ThO2 晶体是用熔融法生长的 .通过 12K下格位选择激发下的发射光谱测量 ,利用晶场理论 ,确定了Eu3 + 在ThO2 占据Oh 和C3v两种格位 .列表给出了两种格位Eu3 + 离子的晶场能级和室温及 12K下的荧光寿命 .讨论了温度对能量传递过程的影响以及低温下激发峰红移的机理 .
The emission spectra, excitation spectra and fluorescence decay curves of Eu 3+ :ThO 2 are reported and analyzed. The Eu 3+ :ThO 2 crystal was grown by the flux technique. Using selective dye laser excitation at 12?K and selection rules, site symmetries of Eu 3+ ions in ThO 2 are determined as O\-h and C 3v . Their crystal field levels and lifetimes were measured and tabulated. The dependence of energy transfer and energy level position on temperature are also discussed.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第9期1859-1866,共8页
Acta Physica Sinica
基金
国家自然科学基金!(批准号 :197740 5 2 )&&
关键词
光谱探针
选择激光光谱
氧化钍
格位对称性
发光
structure probe
selective excitation spectroscopy
energy levels
Eu^(3+) :ThO_2
