P‐80: A New Oxide/Oxysulfide Based Phosphor Triad and High‐Efficiency Green‐Emitting (Y, Gd) ₂ O ₂ S:Tb Phosphor for FED Applications

Abstract

Abstract An oxide/oxysulfide based phosphor triad with particle sizes of around 1micrometer (green Y 2 SiO 5 :Tb or Y 2 O 2 S:Tb, and blue Y 2 SiO 5 :Ce) down to 250nm for the red Y 2 O 3 : Eu is reported. These phosphors perform well in brightness under the conditions necessary for use in FED's and are of suitable size for use in high definition screens. We also report a green emitting Y 2 O 2 S:Tb phosphor that has been prepared by a new method involving homogeneous precipitation of the precursors and a new firing regime. The resulting cathodoluminescent phosphor having submicrometer size particles has a luminous efficiency of 34.6 lm/W at an electron beam accelerating voltage of 5000 V.