A. A. Shakirov, A. S. Nizamutdinov, A. A. Shavelev, S. Kh. Batygov, S. V. Kuznetsov, V. V. Semashko
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Abstract
We presented the results of a spectroscopic study of LiCaAlF6 (LiCAF) samples doped with Ce3+ and Yb3+ ions. Change in the valence of the Yb3+ → Yb2+ ions were detected upon excitation resonant to Ce3+ absorption. Luminescence of Ce3+ and Yb2+ ions was observed at the wavelengths of 280–320 nm and 380 nm, respectively. We associate the appearance of divalent ytterbium with photoionization of Ce3+ ions and subsequent capture of a free charge carriers by Yb3+ ions. Based on the temperature dependence of the lifetimes of excited Yb2+, we conclude that energy transfer to the Yb3+ ion occurs due to the charge exchange processes of Yb2+ ions. However, we also see additional quenching of Yb2+ luminescence when the temperature is raised to room temperature.
期刊介绍：
Bulletin of the Russian Academy of Sciences: Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It presents full-text articles (regular, letters to the editor, reviews) with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. Bulletin of the Russian Academy of Sciences: Physics focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied. Manuscripts can be submitted in Russian and English languages and are subject to peer review. Accepted articles are usually combined in thematic issues on certain topics according to the journal editorial policy. Authors featured in the journal represent renowned scientific laboratories and institutes from different countries, including large international collaborations. There are globally recognized researchers among the authors: Nobel laureates and recipients of other awards, and members of national academies of sciences and international scientific societies.
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