[18a-WL2_101-1~11] 13.8 Optical properties and light-emitting devices

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[18a-WL2_101-8] Effects of Eu³⁺ Co-Doping on the Photoluminescence Properties of Eu²⁺-Activated Ca₂Y₈Si₆O₂₆ Phosphors

〇Yasushi Sato¹, Atsushi Yamanaka¹, Makoto Kobayashi², Koji Tomita³, Masato Kakihana⁴ (1.Okayama Univ. Sci., 2.Nagoya Univ., 3.Tokai Univ., 4.Osaka Univ.)

Keywords:

Phosphors,Rare-Earth,Photoluminescence

Eu²⁺-activated Ca-Y-Si-O phosphors have been extensively investigated based on the concept of crystal site engineering. Ca-Y-Si-O compounds such as Ca₃Y₂Si₃O₁₂, Ca₂Y₂Si₂O₉, and Ca₂Y₈Si₆O₂₆ possess multiple asymmetric crystallographic sites, where Ca²⁺ and Y³⁺ share the same positions in the crystal structure. These multiple Ca/Y sites exhibit different crystal field strengths. Eu²⁺ ions occupying sites with a strong crystal field are expected to exhibit red emission under blue-light excitation due to f–d electronic transitions within Eu²⁺. In this study, we focused on the Ca₂Y₈Si₆O₂₆ phase and carried out the synthesis and evaluation of its photoluminescence properties. The Ca₂Y₈Si₆O₂₆ samples with higher Eu²⁺ contents exhibited red emission when excited in the blue-light region.