Patent ID: 7967654

Claim:
A process for preparation of an organic electroluminescence element comprising the steps of: preparing a positive electrode substrate comprising a transparent substrate, a transparent positive electrode formed on the substrate, and a light-emitting organic material layer formed on the positive electrode; preparing a roll of a negative electrode film comprising the negative electrode film and a core tube or a core tube covered with a metal film around which the negative electrode film is wound up with a tension of 2.5×10 5 to 4.0×10 7 N/m 2 in vacuum or in an atmosphere of an inert gas, the negative electrode film comprising an outer resin film, a metal layer formed on the resin film, and an inner opaque negative electrode layer formed on the metal layer unwinding the negative electrode film; placing the unwound negative electrode film on the positive electrode substrate under the condition that the negative electrode is placed on the light-emitting organic material layer; and pressing the positive electrode substrate and the negative electrode film while heating the organic material layer to soften the organic material layer whereby causing the negative electrode film to adhere to the positive electrode substrate.