ELECTROLUMINESCENT ELEMENT AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To enable an electroluminescent element to have good emission efficiency and long life and provide dark-spot-free, uniform emission using simple constitution. SOLUTION: An anode 12 made from a transparent electrode material such as ITO is formed on a transparent substrate 10 of glass or the like, and electroluminescent materials serving as a hole carrier material 15 and an electron carrier material 16 are deposited over the upper surface of the anode 12 serving as the transparent electrode. A relatively high-purity first cathode layer 18 is deposited over the surface of the electroluminescent material, and a second cathode layer 20 that is relatively low in purity but high in electron donating property is deposited over the surface of the first cathode layer 18.