Synthesis of EU, Dy co-doped SrAl2O4 phosphors by using liquid phase precursor process

Abstract

SrAl2O4: Eu2+, Dy3+s are well-known as persistent luminescence phosphors with high brightness and long afterglow. They have been widely commercialized for afterglow applications such as security signs, emergency route signage, identification markers, and also bio-image in vivo. The persistent researches of SrAl2O4: Eu2+, Dy3+ phosphor have been widely studied during the past decades. In this study, the properties of SrAl2O4: Eu2+, Dy3+ phosphor were studied with wide range firing temperature and different annealing conditions. Synthesis of persistent phosphorescence in Eu2+ and Dy3+ ions co-doped SrAl2O4 phosphors fired at 1100-1300 °C was conducted by using the cellulose assisted liquid phase precursor (LPP) process under reducing atmosphere. The SrAl2O4: Eu2+ showed a typically broad emission band at 512 nm under excitation of UV range and Dy3+ considerably enhanced the persistent luminescence intensity. Europium ions substituted for the two different Sr sites in the phosphor’s the monoclinic of host lattice resulting in greenish emission. The obtained phosphors were measured and analyzed by X-ray diffraction (XRD), scanning electron microscope (FE-SEM) and photoluminescence spectra (PL). © 2016, Hanyang University. All rights reserved.