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中子探测晶体Li_6Gd（BO_3）_3：Ce的光谱特性研究
Optical characterization of neutron detection crystal Li_6Gd（BO_3）_3：Ce
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摘要: 文章用提拉法生长出Li6Gd（BO3）3：Ce晶体,并对其光谱性能与发光过程进行了探索.借助于真空紫外-紫外透过光谱测试,发现晶体的透过光谱中存在Ce3＋离子和Gd3＋的特征吸收峰,同时还存在与Ce4＋离子相关的电荷迁移带.对晶体的真空紫外-紫外激发发射光谱进行研究发现,在晶体存在着Ce3＋离子的5d→4f辐射跃迁发光与Gd3＋离子的4f→4f辐射跃迁发光,而且存在着Gd3＋→Ce3＋之间的能量传递.对Li6Gd（BO3）3：Ce晶体的X射线与γ射线激发发射光谱研究可知,晶体在高能射线激发下的闪烁光主要是Ce3＋离子的发光.
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关键词:
- Li6Gd(BO3)3：Ce晶体 /
- 真空紫外-紫外透过光谱 /
- 真空紫外-紫外激发发射光谱 /
- 能量传递
Abstract: Colorless and transparent Li6Gd（BO3）3：Ce crystals are grown with the Czoralski method.Their optical characteristics and luminescence processes are also investigated.The ultraviolet-vaccum ultraviolet （UV-VUV） transmittance spectra are measured and the result shows that absorption peaks due to Ce3＋ ions and Gd3＋ ions,and the absorption band related to charge transfer band of Ce4＋ ions are present.According to the UV-VUV excitation and emission spectra,it is found that there appear luminescences of 5d→4f radiative transitions of Ce3＋ ions and of 4f→4f radiative transitions of Gd3＋ ions,and also Gd3＋→Ce3＋ energy transfer.The X-ray and γ-ray stimulated luminescence spectra show that the scintillation light of the crystal is mainly from Ce3＋ ions. -
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