Organic electroluminescent device, method for manufacturing organic electroluminescent device, image display device, and method for manufacturing image display device

An organic electroluminescent device comprising:

• a substrate;
• a first electrode formed on the substrate and comprising a pixel region;
• a partition wall formed on the substrate, partitioning the first electrode, and comprising a surface with a recessed and projected surface form;
• a luminescent medium layer formed on the pixel region and the partition wall, a film thickness of the partition wall being uneven according to the recessed and projected form, the luminescent medium layer being partially severed according to the recessed and projected form;
• and
• a second electrode formed on the luminescent medium layer, wherein
• the recessed and projected surface form is formed over substantially all surface portions of the partition wall at which the partition wall and the luminescent medium layer contact each other,
• a calculated average roughness Ra of the recessed and projected surface form is greater than or equal to 1 nm and less than or equal to 200 nm,
• an average interval between protected portions of a surface of the recessed and projected surface form is greater than or equal to 5 nm and less than or equal to 100 nm, and
• the recessed and projected surface form is configured to increase specific resistance of the luminescent medium layer in a film-surface direction and to restrain a leak current passing through the luminescent medium layer formed on the surface of the partition wall.