Abstract:
The present invention relates to a light emitting diode including a substrate, a first conductive type semiconductor layer arranged on the substrate, a second conductive type semiconductor layer arranged on the first conductive type semiconductor layer, an active layer disposed between the first conductive type semiconductor layer and the second conductive type semiconductor layer, a first electrode pad electrically connected to the first conductive type semiconductor layer, a second electrode pad arranged on the first conductive type semiconductor layer, and an insulation layer disposed between the first conductive type semiconductor layer and the second electrode pad, the insulation layer insulating the second electrode pad from the first conductive type semiconductor layer. At least one upper extension may be electrically connected to the second electrode pad, the at least one upper extension being electrically connected to the second conductive type semiconductor layer.
Abstract:
Disclosed is an AC light emitting device having photonic crystal structures and a method of fabricating the same. The light emitting device includes a plurality of light emitting cells and metallic wirings electrically connecting the light emitting cells with one another. Further, each of the light emitting cells includes a first conductive type semiconductor layer, a second conductive type semiconductor layer disposed on one region of the first conductive type semiconductor layer, and an active layer interposed between the first and second conductive type semiconductor layers. In addition, a photonic crystal structure is formed in the second conductive type semiconductor layer. The photonic crystal structure prevents light emitted from the active layer from laterally propagating by means of a periodic array, such that light extraction efficiency of the light emitting device can be improved. Furthermore, the metallic wirings electrically connect a plurality of light emitting cells with one another such that an AC light emitting device can be provided.
Abstract:
Exemplary embodiments of the present invention relate to light emitting diodes. A light emitting diode according to an exemplary embodiment of the present invention includes a substrate having a first side edge and a second side edge, and a light emitting structure arranged on the substrate. The light emitting structure includes a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer. A transparent electrode layer including a concave portion and a convex portion is arranged on the second conductivity-type semiconductor layer. A first electrode pad contacts an upper surface of the first conductivity-type semiconductor layer and is located near a center of the first side edge. Two second electrode pads are located near opposite distal ends of the second side edge to supply electric current to the second conductivity-type semiconductor layer. A first pad extension extends from the first electrode pad and a second pad extension extends from each of the two second electrode pads.
Abstract:
Exemplary embodiments of the present invention provide light-emitting diodes having a distributed Bragg reflector. A light-emitting diode (LED) according to an exemplary embodiment includes a light-emitting structure arranged on a first surface of a substrate, the light-emitting structure including a first conductivity-type semiconductor layer, a second conductivity-type semiconductor layer, and an active layer interposed between the first conductivity-type semiconductor layer and the second conductivity-type semiconductor layer. A first distributed Bragg reflector is arranged on a second surface of the substrate opposite to the first surface, the first distributed Bragg reflector to reflect light emitted from the light-emitting structure. The first distributed Bragg reflector has a reflectivity of at least 90% with respect to light of a first wavelength in a blue wavelength range, light of a second wavelength in a green wavelength range, and light of a third wavelength in a red wavelength range. The first distributed Bragg reflector has a laminate structure having an alternately stacked SiO2 layer and Nb2O5 layer.
Abstract:
Disclosed are a light emitting device and a method of fabricating the same. The light emitting device comprises a substrate. A plurality of light emitting cells are disposed on top of the substrate to be spaced apart from one another. Each of the light emitting cells comprises a first upper semiconductor layer, an active layer, and a second lower semiconductor layer. Reflective metal layers are positioned between the substrate and the light emitting cells. The reflective metal layers are prevented from being exposed to the outside.
Abstract:
The present invention relates to a light emitting device and a method of manufacturing the light emitting device. According to the present invention, the light emitting device comprises a substrate, an N-type semiconductor layer formed on the substrate, and a P-type semiconductor layer formed on the N-type semiconductor layer, wherein a side surface including the N-type or P-type semiconductor layer has a slope of 20 to 80° from a horizontal plane. Further, the present invention provides a light emitting device comprising a substrate formed with a plurality of light emitting cells each including an N-type semiconductor layer and a P-type semiconductor layer formed on the N-type semiconductor layer, and a submount substrate flip-chip bonded onto the substrate, wherein the N-type semiconductor layer of one light emitting cell and the P-type semiconductor layer of another adjacent light emitting cell are connected to each other, and a side surface including at least the P-type semiconductor layer of the light emitting cell has a slope of 20 to 80° from a horizontal plane. Further, the present invention provides a method of manufacturing the light emitting device. Accordingly, there is an advantage in that the characteristics of a light emitting device such as luminous efficiency, external quantum efficiency and extraction efficiency are enhanced and the reliability is secured such that light with high luminous intensity and brightness can be emitted.
Abstract:
A method of fabricating a vertical light emitting diode including: growing a low doped first semiconductor layer on a sacrificial substrate; forming an aluminum layer on the low doped first semiconductor; forming an AAO layer having a large number of holes formed therein by anodizing the aluminum layer; etching and patterning the low doped first semiconductor layer using the aluminum layer as a shadow mask, thereby forming grooves; removing the aluminum layer remaining; sequentially forming a high doped first semiconductor layer, an active layer and a second semiconductor layer on the low doped first semiconductor layer with the grooves; forming a metal reflective layer and a conductive substrate on the second semiconductor layer; separating the sacrificial substrate; and forming an electrode pad on the other surface of the low doped first semiconductor layer, the electrode pad filled in the grooves and in ohmic contact with the high doped first semiconductor.
Abstract:
Disclosed herein is a light emitting diode. The light emitting diode includes a support substrate, semiconductor layers formed on the support substrate, and a metal pattern located between the support substrate and the lower semiconductor layer. The semiconductor layers include an upper semiconductor layer of a first conductive type, an active layer, and a lower semiconductor layer of a second conductive type. The semiconductor layers are grown on a sacrificial substrate and the support substrate is homogeneous with the sacrificial substrate.
Abstract:
Exemplary embodiments of the present invention relate to a including a substrate, a first conductive type semiconductor layer arranged on the substrate, a second conductive type semiconductor layer arranged on the first conductive type semiconductor layer, an active layer disposed between the first conductive type semiconductor layer and the second conductive type semiconductor layer, a first electrode pad electrically connected to the first conductive type semiconductor layer, a second electrode pad arranged on the second conductive type semiconductor layer, an insulation layer disposed between the second conductive type semiconductor layer and the second electrode pad, and at least one upper extension electrically connected to the second electrode pad, the at least one upper extension being electrically connected to the second conductive type semiconductor layer.
Abstract:
The present invention provides a light emitting diode including a lower semiconductor layer formed on a substrate; an upper semiconductor layer disposed above the lower semiconductor layer, exposing an edge region of the lower semiconductor layer; a first electrode formed on the upper semiconductor layer; an insulation layer interposed between the first electrode and the upper semiconductor layer, to supply electric current to the lower semiconductor layer; a second electrode formed on another region of the upper semiconductor layer, to supply electric current to the upper semiconductor layer. The first electrode includes an electrode pad disposed on the upper semiconductor layer and an extension extending from the electrode pad to the exposed lower semiconductor layer. The insulation layer may have a distributed Bragg reflector structure.