Patent ID: 8779656

Claim:
An organic electroluminescence element, comprising a first electrode formed of a metal layer, a first charge transport layer, an emission layer, a second charge transport layer, a second electrode formed of a metal layer, and an out-coupling layer in the stated order, the element causing light emitted by the emission layer to exit from a side of the second electrode, and the element emitting light having a maximum peak wavelength in an emission spectrum of 440 nm or more to 470 nm or less, wherein: the first charge transport layer is in contact with the first electrode; the second charge transport layer and the out-coupling layer are each in contact with the second electrode; an optical path length L between a first interface between the first electrode and the first charge transport layer, and a second interface between the second electrode and the second charge transport layer satisfies the following relationship: (−1−φ/π)×(λ/4)< L <(1−φ/π)×(λ/4) where λ represents the maximum peak wavelength, and φ represents a sum [rad] of phase shifts upon reflection of the light having the maximum peak wavelength λ at the first interface and the second interface; and when a real part of a wavenumber of a surface plasmon generated at the first interface is represented by k r [rad/m] and a real part of a wavenumber of a surface plasmon generated at the second interface is represented by k s [rad/m], the following relationship is satisfied: −4.5×10 6 ≦k r −k s ≦2.1×10 6 .