Ｌａ０．５Ｓｒ０．５ＣｏＯ３放電カソード材料の放電収縮過程

Abstract

The La0.5Sr0.5CoO3 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 La0.5Sr0.5CoO3 has unique electrical characteristic in period of continual discharge.The discharge voltage and luminance of the La0.5Sr0.5CoO3 shift during an extended period of discharge, and the discharge voltage continue to increase in later period of continual discharge. In this report, the discharge and luminescence area shift of the La0.5Sr0.5CoO3 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 discharge area constriction in later periods of continual discharge. In order to find out this mechanism, the discharge and luminance area shift process of the cathode surface were examined by using a model.