MgO-Y2O3:Eu composite ceramics with high quantum yield and excellent thermal performance. Issue 8 (July 2023)

• Record Type: Journal Article
• Authors: Chen, Simin; Yang, Shihong; Chen, Lu; Ma, Zhuangzhuang; Chen, Jian; Guo, Wang
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 8(2023)
• Page Start: 3553
• Page End: 3562
• Publication Date: 2023-07
• Subjects: MgO-Y2O3:Eu -- Composite ceramics -- Thermal conductivity -- Quantum yield; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2023.01.054
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: MgO-Y2 O3 :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. Eu 3+ ions were completely incorporated into Y2 O3 phase, and the optimal Eu concentration is 15 at%. Sintered at 1800 °C, the fluorescent properties of MgO- z vol% Y2 O3 : 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:Y2 O3 ceramic (5.90 W/(m∙K)), respectively, demonstrating their potential for application in high-power-density display and lighting technology.