Patent ID: 8330151

Claim:
An organic electroluminescent element comprising: at least a pair of electrodes, at least one organic light-emitting layer between the pair of electrodes, and at least one lens A on a light-extracting surface of the pair of electrodes, wherein one of the pair of electrodes is a reflective electrode, and the other is a semi-transmissive/semi-reflective electrode, and wherein a real part n 1 of a refractive index of the organic light-emitting layer and a real part n 2 of a refractive index of the lens A satisfy the relationship n 1 >n 2 , and the real part n 2 is represented by Expression (1) described below: n 2 ≦n 3 sin θ 2 Expression (1) in Expression (1), n 3 represents a real part of a refractive index of a lens B having a different refractive index from the lens A; n 3 and n 1 satisfy the relationship n 3 >n 1 ; and θ 2 represents the smallest angle at which when the lens A in the organic electroluminescent element is replaced by the lens B, a perpendicular line is drawn from the light extracting surface to the organic light-emitting layer, light emerged from the organic light-emitting layer passes through the lens B at an angle of θ 3 with respect to the perpendicular line, and a change in chromaticity (Δu′v′) between the angle of θ 3 and the case where θ 3 is equal to 0° on an u′v′ chromaticity coordinate is represented by Expression (2) described below, the change in chromaticity (Δu′v′) is 0.1 or less Δ u′v′ =√{square root over (( u ′(θ 3 )− u ′(0)) 2 +( v ′(θ 3 )− v ′(0)) 2 )}{square root over (( u ′(θ 3 )− u ′(0)) 2 +( v ′(θ 3 )− v ′(0)) 2 )}{square root over (( u ′(θ 3 )− u ′(0)) 2 +( v ′(θ 3 )− v ′(0)) 2 )}{square root over (( u ′(θ 3 )− u ′(0)) 2 +( v ′(θ 3 )− v ′(0)) 2 )}. Expression (2)