Organic electroluminescence light-emitting device and production method thereof

A process for producing an organic electroluminescence light-emitting device, the process comprising the following steps in the following order:

• an element formation step in which an organic functional layer including at least a luminescent layer is formed on the first electrode of a translucent substrate having a first electrode formed thereon, and a second electrode is subsequently formed on the organic functional layer to obtain an organic electroluminescence element;
• a step in which a hygroscopic layer containing a desiccant is formed on a flexible sheet serving as a protective layer;
• a backing member formation step in which a sealing layer having a thickness of 3.3 times or less the thickness of the protective layer and comprising a thermoplastic resin is formed on the hygroscopic layer to obtain a backing member;
• and
• a heat treatment step in which the surface of the organic electroluminescence element on which the second electrode has been formed and the surface of the backing member on which the sealing layer has been formed, are superimposed and heat-treated, so that the hygroscopic layer surrounds at least a luminescent region of the luminescent layer and that the edge of the hygroscopic layer protrudes, along a horizontal direction, from the edge of the luminescent region of the luminescent layer by 0.4 mm or more.

An organic electroluminescence light-emitting device produced by a production process which comprises the following steps in the following order:

• an element formation step in which an organic functional layer including at least a luminescent layer is formed on the first electrode of a translucent substrate having a first electrode formed thereon, and a second electrode is subsequently formed on the organic functional layer to obtain an organic electroluminescence element;
• a step in which a hygroscopic layer containing a desiccant is formed on a flexible sheet serving as a protective layer;
• a backing member formation step in which a sealing layer having a thickness of 3.3 times or less the thickness of the protective layer and comprising a thermoplastic resin is formed on the hygroscopic layer to obtain a backing member;
• and
• a heat treatment step in which the surface of the organic electroluminescence element on which the second electrode has been formed and the surface of the backing member on which the sealing layer has been formed, are superimposed and heat-treated, so that the hygroscopic layer surrounds at least a luminescent region of the luminescent layer and that the edge of the hygroscopic layer protrudes, along a horizontal direction, from the edge of the luminescent region of the luminescent layer by 0.4 mm or more.