Patent ID: 8835962

Claim:
An electroluminescent device comprising: an electroluminescent layer comprising an organic electroluminescent material; an electron injection layer contacting the electroluminescent layer and comprising an electron injection material; a hole injection layer contacting the electroluminescent layer and comprising a hole injection material; and a lens layer contacting the electroluminescent layer and comprising an optical material having a refractive index lower than the refractive index of the electroluminescent material, wherein: the lens layer is continuous and is patterned with an interconnected network of cavities, wherein the cavities extend partially through the thickness of the lens layer; one of the electron injection layer or the hole injection layer is entirely disposed within the cavities; and at least a portion of the electroluminescent material is disposed within the cavities, wherein the lens layer is disposed on a transparent substrate, and wherein the cavities do not extend entirely through the lens layer to the substrate.