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

Abstract

MSi₂O₂N₂:Eu (M = Ca, Sr, Ba) phosphors were fabricated by a solid state reaction using Si₂N₂O powder as starting material. For the Ca_xSr_0.99−xSi₂O₂N₂:Eu_0.01 phosphor, an increase in the value defined as x causes the peak position to increase from 530 to 548 nm and the peak intensity to decrease while the morphotropic phase boundary is observed for x-values of 0.5 to 0.6. For the Ba_xSr_0.99−xSi₂O₂N₂:Eu_0.01 phosphor, an increase in the x-value from 0 to 0.8 causes the peak position to increase from 530 to 557 nm, while increasing the value of x above 0.8 shifts the peak position back within the range of 557–490 nm.