Characterizations of Eu, Dy co-doped SrAl₂O₄ phosphors prepared by the solid-state reaction with B₂O₃ addition

The SrAl₂O₄:Eu²⁺, Dy³⁺ phosphors were prepared by the solid-state reaction with B₂O₃ addition and characterized using XRD, DTA, TEM, SEM and PL. The results indicate that the borates flux, which consists of SrB₂O₄ and SrAl₂B₂O₇, was suggested to facilitate the formation of SrAl₂O₄ and enhance the growth of SrAl₂O₄ crystallites. It also led to the agglomeration of resultant particles. Furthermore, the resultant samples with B₂O₃ addition can show superior emission intensities than the sample without B₂O₃. However, the samples with higher B₂O₃ content at 1300 °C showed weaker emission intensities than that with lower B₂O₃ content, which was due to the formation of second phase. As a result, the sample with 5 mol% B₂O₃ at 1300 °C had the highest emission intensity.