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Luchechko, Andriy; Kravets, Oleh
Physica status solidi. C, January 2017, 20170101, Letnik: 14, Številka: 1-2Journal Article
Ceramic samples of pure MgGa2O4, MgGa2O4: 0.05 mol.% Mn and MgGa2O4: 0.05 mol.% Mn, 5 mol.% Eu were synthesized via high‐temperature solid state reaction method. X‐ray diffraction measurements confirmed formation of spinel structure with Fd3m space group in all investigated samples. Clearly polycrystalline nature of ceramic samples with grain distribution from 1 to 5 μm was confirmed with SEM investigations. An intense broad band that excites in fundamental absorption edge has a maximum around 505 nm and corresponds to emission of Mn2+ ions. A charge transfer band (from O2– to Eu3+) with maximum at about 260 nm was found in the excitation spectra of Mn2+ and Eu3+ co‐doped samples. Luminescence band around 430 nm that corresponds to emission from host defects was found in all investigated samples. Excitation and emission of Eu3+ ions is presented by sharp lines with the most intense at 393 and 617 nm which are associated with 7F0→5L6 and 5D0→7F2 transitions in Eu3+ ions, respectively.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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