La_0.5Sr_0.5CoO₃放電カソード材料の初期放電での放電・発光面積変化

抄録

The La_0.5Sr_0.5CoO₃ was used as a cathode for the first time when the plasma display panel was used on the handheld personal computer. It has favorable sputtering resistance characteristic and stable discharge characteristic in gases. A cathode made from the La_0.5Sr_0.5CoO₃ has unique electrical characteristic in early phase discharge voltage and luminescence characteristics. The discharge voltage and luminance continue to decrease from the starting value. In this report, the discharge and luminescence area shift of the La_0.5Sr_0.5CoO₃ were investigated through an analysis of the DC plasma panel which was made as prototype. It is presumed that the discharge voltage and luminance shift is caused by the discharge and luminance area shift of the cathode surface, and that the current density shift is caused by the surface profile of the cathode particles. In order to find out this mechanism, the spherical form model was applied to the discharge voltage shift, and the discharge voltage and luminance shift process was speculated by means of the measured values and this model.