HIGH LIGHT-EXTRACTION EFFICIENCY (LEE) LIGHT-EMITTING DIODE (LED)

摘要

A light-emitting diode, comprising a substrate that has a first surface and an opposing second surface. A reflection layer is disposed on the first surface of the substrate and a light- emitting diode structure is arranged on the second surface of the substrate. The light-emitting diode structure includes a first semiconducting layer, an active layer and a second semiconducting layer disposed consecutively on the second surface. A plurality of protruding asymmetric micro-structured elements define at least a part of the second surface of the substrate such that at least a portion of a surface of each micro- structured element is disposed at an obtuse angle to the first surface of the substrate when measured from within the respective micro- structured element. The first semiconducting layer and the second semiconducting layer respectively have a first electrode and a second electrode.