Patent ID: 7973469
Filing Date: 2011-07-05
Classification: G02F,H01L,H05B

Abstract:
1. An organic electroluminescence element for emitting white light, comprising: a substrate; a first electrode formed on the substrate; a light-emitting layer formed on the first electrode for generating white light; and a second electrode formed on the light-emitting layer, wherein a refractive index distribution having two-dimensional translational symmetry is provided at one or more of the following locations: near the first electrode inside the substrate; at an interface between the substrate and the first electrode; at an interface between the first electrode and the light-emitting layer; and at an interface between the light-emitting layer and the second electrode, so that light of three or more wavelengths in a visible light region contained in white light generated in the light-emitting layer is diffracted by periodicity of the refractive index distribution and, wherein, when fundamental translational vectors of the refractive index distribution having two-dimensional translational symmetry are vector p=(p a refractive index that the light generated in the light-emitting layer experiences in effective terms inside the substrate, the first electrode, the light-emitting layer, and the second electrode is n, arbitrary integers are represented by M and N, and values λ are represented by the following formula for different sets of (M, N), one or more values λ exist in a red wavelength region, and two or more values λ exist in a green to blue wavelength region.