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Influence of Synthesis Conditions for Yb:CaWO4 Single Crystals on the Down-Conversion Luminescence of Yb3+ Ions in These Crystals

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Abstract

Yb:CaWO4 and Yb, Nb:CaWO4 single crystals have been grown by the Czochralski method in air and in protective atmospheres and subjected to additional annealing in air, in CO/CO2 atmosphere, and in forevacuum. The optical absorption spectra in the range from 250 to 1500 nm and the luminescence spectra of these crystals in the visible and near-IR spectral regions upon UV excitation have been investigated. It is shown that additional introduction of Nb5+ ions into Yb:CaWO4 crystal increases by an order of magnitude (almost to unity) the Yb3+ distribution coefficient between CaWO4 crystal and melt. It is found that optical excitation of the crystals in the range of 260–355 nm induces down-conversion luminescence of Yb3+ ions from the 2F5/2 level in the vicinity of 1 µm. An increase in the oxidative potential of synthesis atmosphere, as well as the introduction of niobium into the crystal composition, weakens this luminescence. A consistent pattern explaining the nature of the donor centers involved in down-conversion population of excited state 2F5/2 of Yb3+ in the crystals is proposed. Within this pattern, Yb2+ ions play the role of these donor centers. Another (much less efficient) mechanism of population of the 2F5/2 level is intracenter relaxation from the higher-lying charge transfer excited state within Yb3+ ions. At the same time, it is confirmed that color centers based on oxygen vacancies and partially reduced tungsten ions, as well as self-trapped excitons on tungstate complexes, are not involved in population of the excited state 2F5/2 of Yb3+ ions, and the optical centers formed in Yb:CaWO4 crystals as a result of vacuum annealing suppress ytterbium luminescence.

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Funding

This study was supported by the Russian Science Foundation (grant no. 18-12-00517).

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Authors and Affiliations

  1. Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia

    K. A. Subbotin, A. I. Titov, D. A. Lis, E. V. Chernova, O. N. Lis, V. A. Smirnov, E. V. Zharikov & I. A. Shcherbakov

  2. Mendeleev University of Chemical Technology of Russia, 125047, Moscow, Russia

    K. A. Subbotin & A. I. Titov

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  1. K. A. Subbotin
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Translated by Yu. Sin’kov

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Subbotin, K.A., Titov, A.I., Lis, D.A. et al. Influence of Synthesis Conditions for Yb:CaWO4 Single Crystals on the Down-Conversion Luminescence of Yb3+ Ions in These Crystals. Phys. Wave Phen. 29, 187–198 (2021). https://doi.org/10.3103/S1541308X21030122

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