Fabrication and luminescent properties of highly transparent novel high-entropy (Lu0.2Y0.2Gd0.2Yb0.2Er0.2)2O3 ceramic

doi:10.1016/j.jmst.2024.10.033

Abstract

Abstract: The highly transparent novel high-entropy (Lu_0.2Y_0.2Gd_0.2Yb_0.2Er_0.2)₂O₃ ceramic was successfully fabricated by the addition of 3 at.% ZrO₂ and 10 at.% La₂O₃ introduced as sintering additives via vacuum sintering. A single-phase solid solution cubic structure of the ceramic was obtained with a relative density of 99.95 % and an average grain size of 6.91±3.28 µm. The grain boundary of the (Lu_0.2Y_0.2Gd_0.2Yb_0.2Er_0.2)₂O₃ ceramic was clean with a thickness of only 1.3 nm. Further observations revealed uniform distribution of all elements in the grains, and the presence of La and Zr segregation (1.5 nm thick) at few grain boundaries, but causing very little light scattering. The in-line transmittance of high-entropy (Lu_0.2Y_0.2Gd_0.2Yb_0.2Er_0.2)₂O₃ ceramic reached 80 % at 1100 nm, which was 98.7 % of the theoretical value of Er₂O₃ single crystal. Also, there were fluorescence emissions observed in the ultraviolet (311 nm), visible (563, 622 nm), and near-infrared (1032, 1535 nm) regions. In addition, the intense red emission and weak green emission were detected, and the broad emission with a peak at 1.5 μm was attributed to Stark splitting of Er³⁺ ions, so the corresponding mechanism was discussed. Results obtained suggest that the highly transparent novel high-entropy (Lu_0.2Y_0.2Gd_0.2Yb_0.2Er_0.2)₂O₃ ceramic fabricated in this study could have broad application prospects in optical applications such as scintillators, up-conversion luminescent materials, and infrared lasers.

Key words: High-entropy ceramics, Transparent ceramics, Up/down-conversion luminescence, Energy level transition

Hong-Lan Liu, Lin-Lin Zhu, Wei-Ming Guo, Hua-Tay Lin. Fabrication and luminescent properties of highly transparent novel high-entropy (Lu_0.2Y_0.2Gd_0.2Yb_0.2Er_0.2)₂O₃ ceramic[J]. J. Mater. Sci. Technol., 2025, 223: 123-130.

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Fabrication and luminescent properties of highly transparent novel high-entropy (Lu_0.2Y_0.2Gd_0.2Yb_0.2Er_0.2)₂O₃ ceramic

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