Fabrication of Eu-doped SrSi₂O₂N₂ phosphor by a solid-state reaction using a new source of Si₂N₂O powder

Abstract

Si 2 N 2 O powder was synthesized by the direct reaction of silicon and silicon dioxide in an N 2 atmosphere at 1450°C; the resulting Si 2 N 2 O powder was doped with Eu in a H 2 /N 2 atmosphere at 1350°C. The Eu-doped SrSi 2 O 2 N 2 powder showed a phosphorescence peak at approximately 530 nm with an excitation wavelength of 450 nm. Increasing the Eu content in the Eu x Sr 1¹x -Si 2 O 2 N 2 (x = 00.15) phosphor red-shifted the peak position. The Eu 0.01 Sr 0.99 Si 2 O 2 N 2 phosphor showed high durability in water, and the emission intensity of the Eu 0.01 Sr 0.99 Si 2 O 2 N 2 phosphor after soaking in water was 1.2 times higher than that of the phosphor before soaking in water.

Phosphorescence properties of MSi₂O₂N₂:Eu (M = Ca, Sr, Ba) mixture-phase phosphors using Si₂N₂O powder

“…In our previous study, we fabricated SrSi 2 O 2 N 2 -based phosphors with a single phase using SrCO 3 and Si 2 N 2 O powders. 11) However, both the limitations of these (Ca, Sr and Ba) solid solutions and their phosphorescence properties have not been discussed in detail.…”