[9a-E218-1~10] 13.8 Optical properties and light-emitting devices

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9a-E218-3] Effects of Be Substitution on Luminescence Properties in Sr₂MgSi₂O₇:Eu,Dy Phosphors

〇(DC)Jumpei Kamikawa¹, Ayumu Otaki², Nobuhisa Fujima^1,2, Hiroko Kominami^1,2, Kazuhiko Hara^1,2,3 (1.GSST, Shizuoka Univ., 2.GSIST, Shizuoka Univ., 3.RIE, Shizuoka Univ.)

Keywords:

long afterglow phosphor,first-principles calculation,element substitution

Be-substituted Sr₂MgSi₂O₇:Eu,Dy was synthesized and evaluated. XRD suggested that Be may substitute at Mg-site, while PL showed enhanced intensity and a blue shift. Afterglow characteristics decreased. PLE and first-principles calculations showed no significant changes in the CTS, host absorption edge, defect levels, and band gap. Therefore, the PL change is attributed to an increased Eu²⁺ 4f-5d energy separation caused by crystal-field modification due to Be substitution.