Sintering and Phosphorescent Properties of Strontium Aluminate (SrAl₂O₄) Phosphors by Spark Plasma Sintering

Abstract

Eu²⁺ and Dy³⁺ co-doped strontium aluminate (SrAl₂O₄) phosphors have been considered as strong and lasting phosphorescent eco-materials for chemically stable, safe making and long lasting phosphorescence process without radiation, compared with sulfide phosphors. In this study, Eu²⁺ and Dy³⁺ co-doped strontium aluminate (SrAl₂O₄) phosphors were prepared by spark-plasma sintering (SPS) at 873 K, 1273 K and 1623 K. The structures of Eu²⁺ and Dy³⁺ co-doped SrAl₂O₄ were investigated by X-ray diffraction (XRD), differential thermal analysis-thermo gravimetric analysis (DTA-TG), and shrinkage during the sintering process. It was found that synthesis of SrAl₂O₄ over 1273 K, two stage shrinkage temperature zone blow 1073 K and over 1573 K. Phosphorescences of Eu²⁺ and Dy³⁺ co-doped SrAl₂O₄ were observed at 450-650 nm.