MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors for field emission displays

MSi2O2−δN2+2/3δ:Eu2+ (M = Sr, Ba) phosphors were prepared through a two-step solid state reaction. XRD results reveal that the samples are nitrogen-rich phase. The photoluminescence results show that the MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors can be excited by UV and blue light. The critical concentrations of Eu2+ are 5 mol% and 4 mol% for MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba), respectively. With an increase of the Eu2+-concentration, the emission color of SrSi2O2−δN2+2/3δ:Eu can be tuned from green to yellow. Under the excitation of low voltage electron beams (1–3 kV), the MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors exhibit green and cyan emission, respectively. The emission intensity increases with the increasing of accelerating voltage and filament current. Due to the excellent stability, good CIE chromaticity and high color purity, MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors may have potential application in the field emission displays.

► MSi2O2−δN2+2/3δ (M = Sr, Ba):Eu2+ with nitrogen-rich phase were synthesized by two-step solid state reaction method.
► With the increase of the Eu2+-concentration, the photoluminescence color of SrSi2O2−δN2+2/3δ:Eu2+ can be tuned from green to yellow.
► Under the excitation of low voltage cathode rays, MSi2O2−δN2+2/3δ:Eu2+(M = Sr, Ba) phosphors exhibit green and cyan emissions, respectively.
► The good stability and high color purity for MSi2O2−δN2+2/3δ:Eu2+ (M = Sr, Ba) phosphors make them have potential applications in FED area.