[21a-E208-1~12] 【CS.4】 Code-sharing Session of 3.11 & 3.12

▲ [21a-E208-8] Spectrally Selective Ultrahigh-Temperature Thermal Emitter with Lanthanum Hexaboride: Operating Temperature Surpassing 1200^oC

〇(DC)Anh Tung Doan^1,2, Thang Duy Dao¹, Dang Hai Ngo^1,2, Orjan Handegard^1,2, Thien Duc Ngo^1,2, Satoshi Ishii¹, Tadaaki Nagao^1,2 (1.Photonics Nano-engineering Group, Materials Architectonics, National Inst. for Materials Science, Japan, 2.Department of Condensed Matter Physics, Graduate School of Science, Hokkaido Univ., Japan)

Keywords:Lanthanum hexaboride, refractory, thermal emitter

Lanthanum hexaboride-based refractory spectrally selective thermal emitter is proposed, fabricated, and characterized at high temperature in both vacuum and ambient air. The thermal emission resonantly enhanced by a planar Gires-Tournois resonator exhibits an extremely narrow full width at half maximum of ~62 nm. Owing to the high refractory properties of lanthanum hexaboride and the effective structural design, the proposed emitter sustains excellent optical characteristic stability and resistance to oxidation at elevated temperature. The emissive and refractory performance at high temperatures of the emitter using lanthanum hexaboride are investigated and compared to those using other refractory metals including tungsten, molybdenum, and tantalum to access their viability for robust high-temperature spectroscopic infrared heaters for the applications in thermophotovoltaics as well as in drying furnaces.