Light emitting diode with improved structure
AssigneeSeoul Opto Device Co., Ltd.
InventorsSang Joon Lee, Dae Sung Kal, Dae Won Kim
Life of this patent
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Abstract
Disclosed is a light emitting diode (LED) with an improved structure. The LED comprises an N-type semiconductor layer, a P-type semiconductor layer and an active layer interposed between the N-type and P-type semiconductor layers. The P-type compound semiconductor layer has a laminated structure comprising a P-type clad layer positioned on the active layer, a hole injection layer positioned on the P-type clad layer, and a P-type contact layer positioned on the hole injection layer. Accordingly, holes are more smoothly injected into the active layer from the P-type semiconductor layer, thereby improving the recombination rate of electrons and holes.
Claims10
A light emitting diode (LED), comprising:
- an N-type semiconductor layer;
- a P-type semiconductor layer;
- and
- an active layer interposed between the N-type semiconductor layer and the P-type semiconductor layer,
- wherein the P-type semiconductor layer comprises a laminated structure, the laminated structure comprising:
- a P-type clad layer positioned on the active layer;
- a hole injection layer positioned on the P-type clad layer;
- a P-type contact layer positioned on the hole injection layer;
- and
- an upper undoped layer interposed between the hole injection layer and the P-type contact layer, the upper updoped layer contacting the hole injection layer,
- wherein a doping concentration of the hole injection layer is lower than a doping concentration of the P-type clad layer,
- wherein a bandqap of the P-type clad layer is wider than a bandqap of the hole injection layer, and the bandqap of the hole injection layer is equal to a bandqap of the P-type contact layer, and
- wherein the hole injection layer, the upper undoped layer contacting the hole injection layer, and the P-type contact layer are semiconductor layers having a substantially identical band gap.
Dependencies are inferred from the claim text.