Afterglow improvement of high concentration Dy³⁺ co-doped SrAl₂O₄:Eu²⁺ phosphor prepared by H₃BO₃ free synthesis using melt quenching method

Abstract

Melt quenching method was applied to prepare the long persistent phosphor SrAl₂O₄:Eu²⁺,Dy³⁺, and Dy³⁺ concentration dependence of afterglow property was investigated. Melt quenched SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors exhibit brighter afterglow intensity compared with these synthesized by a conventional solid-state reaction method. The afterglow property was improved with increase of Dy³⁺ concentration, and 10 mol % Dy³⁺ co-doped sample exhibits approximately 1.3 times higher afterglow intensity than commercially available phosphor.