| abstract |
In order to improve an external quantum efficiency of an organic light-emitting element, a first light extraction layer is formed over the surface of a second substrate on the side where the second substrate is present, a second light extraction layer is formed over the surface of the second substrate on the other side, the first and second light extraction layers contain fine particles and a binder, the average particle diameter of the fine particles contained in the first and second light extraction layers are 0.05 μm or more and 2 μm or less and 1 μm or more and 10 μm or less, respectively, and an optical length L 1 between the emission point of the light emitting layer and a first electrode satisfies (2m−155/180)λ 0 /4/cos 35°≦L 1 ≦(2m−155/180)λ 0 /4/cos 50°, where λ 0 is a center emission wavelength of the light emitting layer and m is an integer of 1 or more. |