Patent ID: 7267596
Filing Date: 2007-09-11
Classification: B82Y,G02B,G02F,H01J,H01L

Abstract:
1. A method for the fabrication of a light-emitting device, comprising the steps of: i) providing a transparent substrate having a front surface and a rear surface, one of said surfaces identifying a plane of the substrate, ii) providing means for generating an electromagnetic radiation, which are oriented with respect to said rear surface such that said electromagnetic radiation passes through the substrate to come out of the front surface thereof, iii) anodizing a sheet or film of aluminium to form a layer of porous alumina, wherein step iii) includes structuring the layer of porous alumina to inhibit propagation of said electromagnetic radiation in directions parallel to the plane of the substrate, so as to improve efficiency of extraction of light from the substrate and to increase directionality of emitted light.