Light-Emitting Diode With Current-Spreading Region
First Claim
1. A light-emitting diode (LED) device comprising:
- a substrate;
an LED structure formed on the substrate, the LED structure including an upper layer and a lower layer with a light-emitting layer positioned between the upper layer and the lower layer; and
a current blocking layer formed in the upper layer, wherein the current blocking layer comprises a region of resistive material comprising implanted impurities.
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Abstract
A light-emitting diode (LED) device is provided. The LED device has a lower LED layer and an upper LED layer with a light-emitting layer interposed therebetween. A current blocking layer is formed in the upper LED layer such that current passing between an electrode contacting the upper LED layer flows around the current blocking layer. When the current blocking layer is positioned between the electrode and the light-emitting layer, the light emitted by the light-emitting layer is not blocked by the electrode and the light efficiency is increased. The current blocking layer may be formed by converting a portion of the upper LED layer into a resistive region. In an embodiment, ions such as magnesium, carbon, or silicon are implanted into the upper LED layer to form the current blocking layer.
58 Citations
19 Claims
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1. A light-emitting diode (LED) device comprising:
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a substrate; an LED structure formed on the substrate, the LED structure including an upper layer and a lower layer with a light-emitting layer positioned between the upper layer and the lower layer; and a current blocking layer formed in the upper layer, wherein the current blocking layer comprises a region of resistive material comprising implanted impurities. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of forming a light-emitting diode (LED), the method comprising:
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providing a substrate; forming an LED structure on a first side of the substrate, the LED structure having a lower layer formed on the substrate, an active layer formed on the lower layer, and an upper layer formed on the active layer; and forming a current blocking layer in the upper layer by implanting impurities into the upper layer. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of forming a light-emitting diode (LED), the method comprising:
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providing a substrate; forming an LED structure on the substrate, the LED structure having one or more lower layers, one or more light-emitting layers, and one or more upper layers; and placing impurities in at least one of the one or more upper layers to form a current blocking layer, the current blocking layer being more electrically resistive than the at least one of the one or more upper layers. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification