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Charge compensations of Eu2+ and Oi2− co-exist in Eu3+:CaMoO4 single-crystal fibers grown by the micro-pulling-down method

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Abstract

Eu3+-Doped CaMoO4 single-crystal fibers with concentrations from 0.01 to 1 at% have been grown by the micro-pulling-down method in an air atmosphere. The origin of the coloration of the crystals can be attributed to the charge compensations. In the air or H2 annealing process, the absorption spectra combined with XPS proved the coexistence of Eu2+ and interstitial O (Oi2−). The density functional theory was simulated to display the absorption spectra of Eu2+-doped and (Eu2+–Oi2−) co-doped CaMoO4, consistent with the experimental data. The low-temperature polarized absorption and emission spectra illustrated the charge compensations. The luminescence spectra of the Eu3+ probe were used to study the Oi2− species. Luminescence decay curves of 5D0 were measured. To the best of our knowledge, this is the first report on the growth and charge compensations of Eu3+:CaMoO4 single-crystal fibers grown by the micro-pulling-down method and the reduction phenomenon of Eu3+ to Eu2+ in an oxidizing atmosphere at high temperature in molybdates. On excitation by near ultraviolet or blue light, the molybdates could be potential hosts for white-light-emitting diodes.

Graphical abstract: Charge compensations of Eu2+ and Oi2− co-exist in Eu3+:CaMoO4 single-crystal fibers grown by the micro-pulling-down method

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Publication details

The article was received on 14 Jul 2018, accepted on 24 Sep 2018 and first published on 28 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01160E
Citation: CrystEngComm, 2018, Advance Article
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    Charge compensations of Eu2+ and Oi2− co-exist in Eu3+:CaMoO4 single-crystal fibers grown by the micro-pulling-down method

    J. Shu, Z. Jia, E. Damiano, H. Wang, Y. Yin, N. Lin, X. Zhao, X. Xu, M. Tonelli and X. Tao, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE01160E

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