镧系元素
十二面体
激发态
热释光
八面体
分析化学(期刊)
能级分裂
光致发光
余辉
兴奋剂
化学
掺杂剂
发射光谱
原子物理学
谱线
发光
材料科学
结晶学
晶体结构
物理
离子
有机化学
光电子学
色谱法
伽马射线暴
天文
作者
Hongde Luo,Lixin Ning,Yuanyuan Dong,A.J.J. Bos,P. Dorenbos
标识
DOI:10.1021/acs.jpcc.6b09077
摘要
Photoluminescence excitation (PLE) and emission spectra (PL) of undoped (Sr, Ca)3(Y, Lu)2Ge3O12 as well as Eu3+- and Ce3+-doped samples have been investigated. The PL spectra show that Eu3+ enters into both dodecahedral (Ca, Sr) and octahedral (Y, Lu) sites. Ce3+ gives two broad excitation bands in the range of 200–450 nm. First-principle calculations for Ce3+ on both dodecahedral and octahedral sites provide sets of 5d excited level energies that are consistent with the experimental results. Then the vacuum referred binding energy diagrams for (Sr, Ca)3(Y, Lu)2Ge3O12 have been constructed with the lanthanide dopant energy levels by utilizing spectroscopic data. The Ce3+ 5d excited states are calculated by first-principles calculations. Thermoluminescence (TL) glow curves of (Ce3+, Sm3+)-codoped (Sr, Ca)3(Y, Lu)2Ge3O12 samples show a good agreement with the prediction of lanthanide trapping depths derived from the energy level diagram. Finally, the energy level diagram is used to explain the low thermal quenching temperature of Ce3+ and the absence of afterglow in (Sr, Ca)3(Y, Lu)2Ge3O12.
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