[9p-Z04-1~20] 13.8 Optical properties and light-emitting devices

[9p-Z04-5] Synthesis of high concentration Dy³⁺-doped SrAl₂O₄:Eu²⁺, Dy³⁺

〇Kenji Toda¹, Ryo Tanaka¹ (1.Niigata Univ.)

Keywords:Phosphor, Rare Earths, Afterglow

Persistent phosphor SrAl₂O₄:Eu²⁺, Dy³⁺ has been used as luminous paints for emergency signs and dial of watch. In this study, SrAl₂O₄:Eu²⁺, Dy³⁺ was synthesized by a melt quenching method using a specially designed arc-imaging furnace. 1 mol% Eu²⁺ and 0-10 mol% Dy³⁺ doped samples were prepared by the melt quenching technique. (Sr_0.97Eu_0.01Dy_0.02)Al₂O₄ synthesized by the melt quenching method showed higher afterglow intensity than that synthesized by the SSR. Moreover, the afterglow emission intensity of the melt quenched sample improved as Dy³⁺ concentration increased.