Patent ID: 6168729
Filing Date: 2001-01-02
Classification: C09K

Abstract:
A fluorescent display device comprising an anode; an electron source for emitting electrons; and a phosphor layer present on said anode; wherein said phosphor layer includes a fluorescent material comprising a mixture including a phosphor which is excitable at a voltage of 1 kV or higher for emitting light, and a phosphor which is excitable at a voltage of 1 kV or lower for emitting light, wherein each phosphor emits light of the same color, wherein the fluorescent material is luminous at an anode voltage of 2 kV or lower, and wherein said phosphor which is excitable at a voltage of 1 kV or higher is selected from a terbium activated yttrium aluminum gallium oxide phosphor, Y.sub.2 SiO.sub.5 :Tb, InBO3:Tb, or Zn.sub.2 SiO.sub.4 :Mn; said phosphor which is excitable at a voltage of 1 kV or lower is selected from Zn(Ga,Al).sub.2 O .sub.4 :Mn; said phosphor layer emitting light upon impingement of electrons emitted from said electron source thereon, wherein said impingement of said electrons is effected by an anode voltage of 2 kV or less; and wherein said electron source is a filament oxide cathode.