| abstract |
(57) [Summary] (with correction) [PROBLEMS] To improve the luminance of the entire phosphor and extend the life of the plasma display device. SOLUTION: In the plasma display device, the phosphor layer has a blue phosphor layer, and the blue phosphor layer has a blue phosphor layer. AM (Ba 1-x MgAl 10 O 17: Eu x or Ba 1-xy Sr y MgAl 10 O 17: constituted by Eu x) based blue phosphor, the blue phosphor is a plate-like particle, and plate size is 0.3Myuemuļ½˛6myuemu, the thickness 0.1-2 .mu.m, plate diameter And the plate thickness ratio is 3 to 25, and the specific surface area is 2.0 to 3.0 m 2. / G, atomic ratio x of europium (Eu) as activator Are 0.03 <x <0.25 and 0 <y <0.25. As a result, it is possible to improve the luminance of the entire phosphor and extend the life. |