Patent ID: 8638031

Claim:
An organic electroluminescence device, comprising two electrodes and a plurality of organic layers between the two electrodes, the organic layers including a light emitting layer that emits light when an electric field is applied between the two electrodes, wherein: the device further comprises a plurality of metal fine particles, which generates a local plasmon by emission light emitted from the light emitting layer, inside of at least either one of the two electrodes or adjacent to a side of the at least either one of the two electrodes facing the organic layers and inside of a conductive organic layer; wherein a maximum length d of the metal fine particles satisfies Formula (1) below: d > 3 ⁢ λ 3 ⁢ Im ⁡ [ n ⋒ 2 - 1 n ⋒ 2 + 1 ] 4 ⁢ π 3 ⁢ n 3 ⁢ Abs ⁡ [ n ⋒ 2 - 1 n ⋒ 2 + 1 ] 2 3 n ⋒ = n particle / n where, λ is an emission wavelength, n is a refractive index of the conductive layer, and n particle is a complex refractive index of the metal fine particles; wherein the maximum length d has an upper value of 120 nm; at least some of the plurality of metal fine particles are located adjacent to the light emitting layer; and a scattering cross section σ S of the metal fine particles with respect to emission light emitted from the light emitting layer is larger than an absorption cross section σ A of the metal fine particles with respect to the emission light.