23-04-2015 дата публикации
Номер: US20150108527A1
Принадлежит:
A light emitting diode includes a semiconductor stacked structure, a substrate, a first electrode, a second electrode and a third electrode. The semiconductor stacked structure includes a first semiconductor layer, a second semiconductor layer and a light emitting layer. A light extraction layer with a roughened structure is formed on the doped semiconductor layer to improve the light emitting efficiency of LED. Furthermore, the strength of the semiconductor stacked structure can be enhanced by the light extraction layer, to improve the reliability of the LED and the production yields of manufacturing process. 1. A light emitting diode , comprising: a first semiconductor layer;', 'a second semiconductor layer, stacked with the first semiconductor layer; and', 'a light emitting layer, disposed between the first semiconductor layer and the second semiconductor layer;, 'a semiconductor stacked structure, comprisinga substrate, carrying the semiconductor stacked structure and facing the second semiconductor layer;a first electrode, disposed between the second semiconductor layer and the substrate and electrically connected to the second semiconductor layer and the substrate;a second electrode, disposed on the first semiconductor layer; andan outer light extraction layer, disposed on the first semiconductor layer, wherein the outer light extraction layer forms a roughened structure, and a light refractive index of the outer light extraction layer is less than a light refractive index of the first semiconductor layer.2. The light emitting diode according to claim 1 , wherein the roughened structure comprises a plurality of pyramids or a plurality of micro lenses.3. The light emitting diode according to claim 1 , wherein the outer light extraction layer comprises a transparent conductive material claim 1 , and the outer light extraction layer is electrically connected to the second electrode.4. The light emitting diode according to claim 1 , further comprising at least one ...
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