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This study reports the presence of Yb2+ ions with 4f136s electron configuration of the ground state in addition to Yb3+ ions in yttrium aluminium garnet ceramics activated by ytterbium. Pulsed cathodoluminescence and transmission spectra of divalent ytterbium ions appear as narrow lines of s↔s transitions at 913–1050nm range. These ions in association with oxygen vacancies generate Re–F centres which...
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