Patent ID: 7075229
Filing Date: 2006-07-11
Classification: B82Y,G02B,G02F,H01J,H01L

Abstract:
1. A light-emitting device, comprising a transparent substrate having a front surface and a rear surface, one of said surfaces identifying a plane of the substrate, means for generating an electromagnetic radiation comprising a first electrode, a second electrode and an electroluminescent material, said means being oriented with respect to said rear surface such that said electromagnetic radiation passes through the substrate to come out of the front surface thereof, and a layer of porous alumina, wherein the first and the second electrodes are both in electrical contact with the electroluminescent material, and the layer of porous alumina is structured to inhibit propagation of said electromagnetic radiation in directions parallel to the plane of the substrate, so as to improve the efficiency of extraction of light from the substrate and increase directionality of emitted light.