1. MgO-Y2O3:Eu composite ceramics with high quantum yield and excellent thermal performance.
- Author
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Chen, Simin, Yang, Shihong, Chen, Lu, Ma, Zhuangzhuang, Chen, Jian, and Guo, Wang
- Subjects
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CERAMICS , *THERMAL conductivity , *ACTIVATION energy - Abstract
MgO-Y 2 O 3 :Eu composite ceramics with high quantum yield and excellent thermal performance were successfully synthesized by vacuum sintering. All samples exhibited uniform composite microstructures and pure binary phase. Eu3+ ions were completely incorporated into Y 2 O 3 phase, and the optimal Eu concentration is 15 at%. Sintered at 1800 °C, the fluorescent properties of MgO- z vol% Y 2 O 3 : Eu (z = 30, 40, 50, 60, 70, 100) composites proved to be independent on component proportion, including the similar fluorescence lifetimes (953–983 μs), quantum yield (70%−80%), and activation energy (ΔE) of thermal quenching (0.163 eV). Significantly, thermal conductivity of composites with 30 vol%, 50 vol% and 70 vol% MgO attained 11.58, 17.45, and 29.65 W/(m∙K) at room temperature, which are nearly 2, 3, and 5 times as high as that of 15 at% Eu:Y 2 O 3 ceramic (5.90 W/(m∙K)), respectively, demonstrating their potential for application in high-power-density display and lighting technology. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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