[12p-A303-1~15] 13.8 Optical properties and light-emitting devices

[12p-A303-10] Luminescence property of high concentration Dy³⁺ co-doped SrAl₂O₄:Eu²⁺, Dy³⁺

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

Keywords:Long persistent phosphor, Melt quenching method, Rare earth

In this study, 1 mol% Eu²⁺ and 0-10 mol% Dy³⁺ doped SrAl₂O₄:Eu²⁺, Dy³⁺ was synthesized by a melt quenching method using a specially designed arc-imaging furnace. The temperature of the sample reaches 2273 K for tens of seconds and molten samples are rapidly cooled at over -100 K/s. The rare earth concentrations of 1 mol% Eu²⁺ and 2 mol% Dy³⁺ are optimal for the solid-state reaction product. (Sr_0.89Eu_0.01Dy_0.10)Al₂O₄ synthesized by the melt quenching method showed higher afterglow intensity than that synthesized by the solid-state reaction.