Patent ID: 7986093

Claim:
An organic light-emitting diode capable of emitting light, comprising: a substrate; an organic electroluminescent layer capable of emitting light and being interposed between a lower electrode and a partially transparent upper electrode, said electrodes configured to pass a current through the organic electroluminescent layer and thus cause, within this layer, the emission of light, said partially transparent upper electrode comprising at least one transparent or semitransparent conducting sublayer of approximately uniform thickness and a current distributing metal sublayer having opaque zones for distributing current and between which gaps are defined that form windows for passage of the light emitted by the electroluminescent layer; a reflective lower layer interposed between said substrate and said organic electroluminescent layer or is integrated into the substrate, said reflective lower layer for reflecting said emitted light; and a transparent dielectric antireflection layer of approximately uniform thickness and having an external face in contact with a medium, such as air, and, an internal face in contact with a said transparent conducting sublayer and said opaque metal sublayer, wherein: a material and the thickness of said dielectric antireflection layer are chosen with a material of said current-distributing metal sublayer so that measured reflectance at the opaque zones, at normal incidence, and at a wavelength λ amb close to 550 nm, is less than 0.1; wherein λ is defined as a wavelength close to a maximum of emittance for the emitted light, and wherein the material, the index measured at the wavelength λ and the thickness of said dielectric antireflection layer are chosen with the material, the index measured at the wavelength λ and the thickness of the at least one transparent or semitransparent conducting sublayer such that a semireflective upper layer is obtained and configured to partially reflect said emitted light and to have its maximum of reflectance measured at wavelength λ at normal incidence, wherein the reflective lower layer and the semireflective upper layer define an optical cavity for the light emitted by the organic electroluminescent layer, and a distance d 6 between these layers delimiting said optical cavity being adapted to obtain constructive interference of the light emitted within this organic electroluminescent layer.