Patent ID: 8686630

Claim:
An organic electroluminescence element comprising: a transparent substrate sequentially provided thereon, a transparent electrode, an organic electroluminescence layer and a cathode, wherein the transparent substrate is a transparent resin film having a hard coat layer on both sides, the transparent resin film having a refractive index in a range of not less than 1.70 and not more than 1.80, the hard coat layer comprises a resin containing microparticles having a particle diameter of 1-400 nm in an amount of 5-30% by volume and a light scattering, polymer filler, each refractive index of the hard coat layer satisfies Expressions (1)-(4), the transparent substrate has a function to scatter a light to the light emission side with respect to the organic electroluminescence layer; âˆ’0.2 â‰¦n ( H 1)âˆ’ n ( A )â‰¦0.2â€ƒâ€ƒExpression (1) âˆ’0.1 â‰¦n ( H 1)âˆ’ n ( B )â‰¦0.1â€ƒâ€ƒExpression (2) âˆ’0.1 â‰¦n ( H 2)âˆ’ n ( B )â‰¦0.1â€ƒâ€ƒExpression (3) âˆ’0.1 â‰¦n ( H 1)âˆ’ n ( H 2)â‰¦0.1, whereinâ€ƒâ€ƒExpression (4) n(A) is a refractive index of the transparent electrode; n(H1) is a refractive index of the hard coat layer (on the transparent electrode side); n(H2) is a refractive index of the hard coat layer (on an opposite side to the transparent electrode); and n(B) is a refractive index of the transparent resin film.