Light-emitting substrate, manufacturing method thereof, and electron-beam excitation image display apparatus using light-emitting substrate

A method of manufacturing a light-emitting substrate which has, on a light transmissive substrate, a plurality of phosphors which emit different colors by receiving irradiated electrons, and a metal back layer covering these phosphors, and can generate white by different colors from the plurality of phosphors,

• the method comprising steps of:
• forming a plurality of phosphors for emitting different colors which can generate white on the light transmissive substrate;
• filling a resin member in a surface of a phosphor having a lowest E/L ratio, which is a ratio of the luminance (L) and luminous efficiency (E) when white is generated so as to smooth the surface;
• and
• forming a metal back layer for coating the plurality of phosphors including the phosphor in which the resin member is filled, wherein
• in the step of filling the resin member in the surface of the phosphor having the lowest E/L ratio for smoothing the surface, fluorescent material layer of the phosphor having the lowest E/L ratio is formed so that thickness thereof is less than that of the other phosphors, and the resin member is filled down to the surface of the fluorescent material layer of the phosphor having the lowest E/L ratio, whereby the surface of the phosphor having the lowest E/L ratio becomes smoother than the surface of the other phosphors, and a light reflectance difference is created so that a light reflectance of the metal back layer on the phosphor having the lowest E/L ratio on the phosphor side is higher than those of the metal back layer on the other phosphors.