Patent ID: 7531961

Claim:
A plasma display device having a plasma display panel in which a plurality of discharge cells having a plurality of colors are disposed, phosphor layers having a color corresponding to the respective discharge cells are disposed, and the phosphor layers are excited by ultraviolet light to emit light, wherein the phosphor layers comprise: a green phosphor layer made of one of (i) xBaO.yMgO.zAl 2 O 3 .aMnO having a β-alumina crystal structure wherein Mn atoms have a bivalent Mn ion concentration of 80-99% and a trivalent Mn ion concentration of 1-20%, wherein 0.7≦x≦0.95, 0.05≦y≦0.2, 5.0≦z≦6.0, and 0.05≦a≦0.2, (ii) xBaO.yAl 2 O 3 .zMnO having a β-alumina crystal structure wherein Mn atoms have a bivalent Mn ion concentration of 80-99% and a trivalent Mn ion concentration of 1-20%, wherein 0.7≦x≦0.95, 5≦y≦6, and 0.05≦z≦0.2, and (iii) ReBO 3 :Tb where Re is one of Y, Sc, La, Ce and Gd; a blue phosphor layer made of one of Ba 1-x Eu x MgAl 10 O 17 and Ba 1-x-y Eu x Sr y MgAl 10 O 17 , wherein 0.05≦x≦0.2, and 0.05≦y≦0.5, and wherein the one of Ba 1-x Eu x MgAl 10 O 17 and Ba 1-x-y Eu x Sr y MgAl 10 O 17 has a β-alumina crystal structure wherein Eu atoms have a bivalent Eu ion concentration of 40-90% and a trivalent Eu ion concentration of 10-60%; and a red phosphor layer made of one of (Y,Gd) 1-x Eu x BO 3 and (Y 1-x Eu x ) 2 O 3 , wherein 0.01≦x≦0.3, and wherein Eu atoms have a trivalent Eu ion concentration of 100%.