| abstract |
For a PDP, a panel having favorable discharge properties such a high discharge efficiency and a short discharge delay, being chemically stable and capable of electric power saving, is desired. A protective layer of PDP contains a Mayenite compound wherein at least a part of oxygen constituting the Mayenite compound is substituted by electrons, and a part of the electrons is further substituted by anions of atoms having lower electron affinity than that of oxygen. The Mayenite compound has an electron density of at least 1x10<SP>15</SP> cm-3, and the secondary electron emission coefficients excited by Ne or Xe ions at an accelerating voltage of 600 V, are respectively at least 0.05 at a secondary electron collector voltage at which secondary electrons can be sufficiently captured. |