Patent ID: 7446465

Claim:
A multi-color luminous fluorescent display device including therein a vacuum-sealed vessel having a glass substrate, an anode disposed on the glass substrate, a cathode installed in the vacuum-sealed vessel, a first phosphorescent layer containing a phosphor emitting yellow to red light, and a second phosphorescent layer containing a phosphor emitting blue to green light, wherein the first phosphorescent layer contains a Lu 2 O 2 S: Eu phosphor which emits yellow to red light; and the second phosphorescent layer contains at least one phosphor selected from ZnO:Zn phosphor, ZnGa 2 O 4 phosphor and ZnGa 2 O 4 :Mn phosphor which emit blue to green light, and wherein an area of the second phosphorescent layer containing at least one phosphor selected from ZnO:Zn phosphor, ZnGa 2 O 4 phosphor and ZnGa 2 O 4 :Mn phosphor is 95% or less of an area of the total phosphorescent layers in the fluorescent display device.