Patent ID: 9577206
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. An organic electroluminescence element, comprising: a substrate having a light transmissive property; a light diffusion layer on a surface of the substrate; a light transmissive electrode on a surface of the light diffusion layer; a light reflective electrode paired with the light transmissive electrode; and multiple light emitting layers which are spaced from each other and are between the light transmissive electrode and the light reflective electrode, the multiple light emitting layers including an m-th light emitting layer which is an m-th closest light emitting layer to the light reflective electrode, where m is an integer equal to or more than 1; λ Ø(λ wherein n an average refractive index of a medium filling a space between the light reflective electrode and the m-th light emitting layer being represented by n a distance from the light reflective electrode to the m-th light emitting layer being represented by d each of at least two of the multiple light emitting layers satisfying relations defined by following expressions (2) and (3): where l is an integer equal to or more than 0, wherein the light diffusion layer includes a first transparent material layer and a second transparent material layer arranged in this order from the substrate, an uneven structure is provided to an interface between the first transparent material layer and the second transparent material layer, and an interval P of the uneven structure is in a range of λm to 20λm.