Discharging Characteristics of Green Cell Using MgO-Coated Zn2SiO4:Mn2+ Phosphor in Plasma Display Panel

Abstract

The charging tendency of a Zn2SiO4:Mn2+ phosphor surface was modified in order to improve the discharging characteristics of green cell in an ac-plasma display panel (ac-PDP). The zinc silicate (Zn2SiO4:Mn2+) green-emitting phosphor was coated with magnesium oxide (MgO), which has a positive charge on the surface. After fabricating a green cell with MgO-coated Zn2SiO4:Mn2+, the electrical and optical properties were examined. It was found that the dynamic voltage margin could be increased while decreasing address time. This may be ascribed to a change in the charging tendency of Zn2SiO4:Mn2+ phosphor by the MgO coating, which makes stable wall-charge accumulation possible. When Zn2SiO4:Mn2+ phosphor was coated with 1.3 wt% MgO, the address time was decreased to 1.2 µs and the address voltage lowered to 25 V without any misfiring problem, compared with those of a noncoated Zn2SiO4:Mn2+ phosphor layer. The luminescence intensity of the green cell using the MgO-coated phosphor layer was also improved by 10%.