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Luminescence properties of Eu~(3+) ions in K_2YF_5 crystals

机译:K_2YF_5晶体中Eu〜(3+)离子的发光性质

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摘要

Luminescence properties of Eu~(3+) ions (0.1,1.0 and 6.0 mol%) in K_2YF_5 crystals are investigated by the site-selective laser-excitation spectroscopy. The excitation spectrum of the ~5D_0 emission exhibits two strong ~7F_0→~5D_0 excitation lines together with four weaker lines. Six different emission spectra are obtained under the excitation at each excitation line indicating that there existed at least six different sites for Eu~(3+). The relative intensity of the excitation lines is dependent on the Eu~(3+) concentrations. The ~5D_0 emissions of Eu~(3+) show two types of decay behavior with lifetimes of 0.5 and 5.0 ms at 15 K. It is suggested that the fast and slow decays correspond to isolated and paired Eu~(3+) ions in K_2YF_5. The results are discussed in relation with one dimensional chain structure of the K_2YF_5 lattice.
机译:通过定点激光激发光谱研究了Eu〜(3+)离子(0.1、1.0和6.0 mol%)在K_2YF_5晶体中的发光性质。 〜5D_0发射的激发光谱显示出两条强的〜7F_0→〜5D_0激发线以及四条较弱的线。在每个激发线的激发下获得了六个不同的发射光谱,表明存在至少六个Eu〜(3+)不同的位点。激发线的相对强度取决于Eu〜(3+)浓度。 Eu〜(3+)的〜5D_0发射在15 K下的寿命为0.5和5.0 ms表现出两种衰变行为。建议快速衰变和慢速衰变分别对应于孤立和成对的Eu〜(3+)离子。 K_2YF_5。讨论了与K_2YF_5晶格的一维链结构有关的结果。

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