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Article Dans Une Revue Journal of the European Ceramic Society Année : 2022

ZnO – Yb$_2$O$_3$ composite optical ceramics: Synthesis, structure and spectral-luminescent properties

Résumé

Zinc oxide optical ceramics containing 0 – 2 wt% ytterbium are prepared by uniaxial hot pressing of commercial oxides at 1150 and 1180 °C. The ceramics have the main crystalline phase of hexagonal wurtzite-type ZnO. Ytterbium ions do not enter the ZnO crystals but form a cubic sesquioxide phase of Yb2O3 located at the ZnO grain boundaries. Yb acts as an inhibitor for the ZnO grain growth. The ceramics exhibit transmittance up to 60% in the visible. Their transmission in the infrared is determined by the free charge carrier absorption. The Yb3+ ions are found in C2 and C3i sites in Yb2O3 crystals. Under X-ray excitation, the ceramics exhibit intense luminescence bands in the blue (near-band-edge emission) and green (defect emission) whose positions, intensities and decay times depend on the Yb content. Yb2O3 causes a redistribution of luminescence intensity in favor of the near-band-edge emission and fastens the emission decay.
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Dates et versions

hal-03858687 , version 1 (17-11-2022)

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Elena Gorokhova, Olga Dymshits, Ivan Venevtsev, Liza Basyrova, Irina Alekseeva, et al.. ZnO – Yb$_2$O$_3$ composite optical ceramics: Synthesis, structure and spectral-luminescent properties. Journal of the European Ceramic Society, 2022, 42 (2), pp.616-630. ⟨10.1016/j.jeurceramsoc.2021.10.031⟩. ⟨hal-03858687⟩
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