Patent ID: 7147802

Claim:
A plasma display device comprising: a plasma display panel having a plurality of discharge cells of at least one color and a phosphor layer of a color corresponding to the color of each of said discharge cells; wherein a phosphor constituting said phosphor layer is operable to be excited by an ultraviolet ray so as to emit light; wherein said phosphor layer comprises a green phosphor layer; and wherein said green phosphor layer includes a phosphor in which at least one monovalent oxide of a group including potassium oxide (K 2 O), cesium oxide (Cs 2 O), rubidium oxide (Rb 2 O), copper oxide (Cu 2 O), and silver oxide (Ag 2 O) is added to a green phosphor (Zn 1-x Mn x ) 2 SiO 4 (0.01≦x≦0.2) having a crystal structure of Zn 2 SiO 4 :Mn in an amount in a range of 0.001 wt % to 0.5 wt %.