Patent ID: 6720730
Filing Date: 2004-04-13
Classification: H01L

Abstract:
An LED lamp for generating incoherent visible light, comprising:an inorganic semiconductor structure comprising a lower semiconductor layer having a lower face thereof and an upper semiconductor layer having an upper face thereof, said lower and upper semiconductor layers forming a diode and an active region between said layers generating light, said structure having outer side faces (25) surrounding the structure and a plane generally parallel to said lower face defining a reference plane; means harvesting vertical light from said active region; at least one metal conductor on said semiconductor structure electrically connected with said upper semiconductor layer; a plurality of cavities in said semiconductor structure, each cavity extending from said upper face into said semiconductor structure and each containing a metal part that is in electrical contact with said lower semiconductor layer and that is distant from said outer side faces; said semiconductor structure being arranged to have several light-extraction surfaces for enhancing release of light from the semiconductor structure, said light-extraction surfaces being distant from said outer side faces and inclined to said reference plane, LED light propagating in the semiconductor structure being diverted at said light-extraction surfaces; and electrical interconnection for causing the metal parts in said cavities to pass current together when the lamp is turned on.