摘要:
The present invention comprises a substrate, and at least one serial array having a plurality of light emitting cells connected in series on the substrate. Each of the light emitting cells comprises a lower semiconductor layer, an upper semiconductor layer, an active layer interposed between the lower and upper semiconductor layers, a lower electrode formed on the lower semiconductor layer exposed at a first corner of the substrate, an upper electrode layer formed on the upper semiconductor layer, and an upper electrode pad formed on the upper electrode layer exposed at a second corner of the substrate. The upper electrode pad and the lower electrode are respectively disposed at the corners diagonally opposite to each other, and are symmetric with respect to those of adjacent another of the light emitting cells.
摘要:
The present invention relates to a light emitting device. The light emitting device according to the present invention comprises a light emitting cell block having a plurality of light emitting cells; and a bridge rectifying circuit connected to input and output terminals of the light emitting cell block, wherein the bridge rectifying circuit includes a plurality of diodes between nodes. In manufacturing an AC light emitting device with a bridge rectifying circuit built therein, the present invention can provide a light emitting device capable of enhancing the reliability and luminance of the light emitting device by setting the size of diodes of the bridge rectifying circuit to be a certain size and controlling the number thereof.
摘要:
A light emitting diode (LED) chip for high voltage operation and an LED package including the same arc disclosed. The LED chip includes a substrate, a first array formed on the substrate and including n light emitting cells connected in series, and a second array formed on the substrate and including m (m≦n) light emitting cells connected in series. During operation of the LED chip, the first array and the second array are operated by being connected in reverse parallel to each other. Further, when a driving voltage of the first array is delined as Vd1 and a driving voltage of the second array is defined as Vd2, a difference between Vd1 and Vd2×(n/m) is not more than 2V.
摘要:
There is provided a method of fabricating a vertical light emitting diode. The method comprises the steps of: growing a low doped first conductive semiconductor layer on a sacrificial substrate; forming an aluminum layer on the low doped first conductive semiconductor layer; forming an AAO layer having a large number of holes formed therein by performing anodizing treatment of the aluminum layer; etching and patterning the low doped first conductive semiconductor layer using the aluminum layer with a large number of the holes as a shadow mask to expose a portion of the low doped first conductive semiconductor layer, thereby forming a large number of grooves; removing the aluminum layer remaining on the low doped first conductive semiconductor layer; sequentially forming a high doped first conductive semiconductor layer, an active layer and a second conductive semiconductor layer on the low doped first conductive semiconductor layer with a large number of the grooves; forming a metal reflective layer and a conductive substrate on the second conductive semiconductor layer; separating the sacrificial substrate; and forming an electrode pad on the other surface of the low doped first conductive semiconductor layer, the electrode pad being filled in a large number of the grooves to be in ohmic contact with the high doped first conductive semiconductor layer.
摘要:
AC LED according to the present invention comprises a substrate, and at least one serial array having a plurality of light emitting cells connected in series on the substrate. Each of the light emitting cells comprises a lower semiconductor layer consisting of a first conductive compound semiconductor layer formed on top of the substrate, an upper semiconductor layer consisting of a second conductive compound semiconductor layer formed on top of the lower semiconductor layer, an active layer interposed between the lower and upper semiconductor layers, a lower electrode formed on the lower semiconductor layer exposed at a first corner of the substrate, an upper electrode layer formed on the upper semiconductor layer, and an upper electrode pad formed on the upper electrode layer exposed at a second corner of the substrate. The upper electrode pad and the lower electrode are respectively disposed at the corners diagonally opposite to each other, and the respective light emitting cells are arranged so that the upper electrode pad and the lower electrode of one of the light emitting cells are symmetric with respect to those of adjacent another of the light emitting cells.
摘要:
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.
摘要:
There are provided a light emitting device and a method of manufacturing the same. A light emitting device according to the present invention includes a substrate; an N-type semiconductor layer, an active layer and a P-type semiconductor layer, sequentially formed on the substrate; one or more trenches formed to expose the N-type semiconductor layer by partially removing at least the P-type semiconductor and active layers; a first insulating layer formed on sidewalls of the trenches; and a conductive layer filled in the trenches having the first insulating layer formed therein. According to the present invention, it is possible to obtain a characteristic of uniform current diffusion, and thus, light is uniformly emitted to thereby enhance the light emitting efficiency.
摘要:
Disclosed is a light emitting diode having extensions of electrodes for improving current spreading. The light emitting diode includes a lower semiconductor layer, an upper semiconductor layer and an active layer, which are formed on a substrate. The upper semiconductor layer is located above the lower semiconductor layer such that edge regions of the lower semiconductor layer are exposed, and has indents indented in parallel with diagonal directions from positions in the edge regions adjacent to corners of the substrate in a clockwise or counterclockwise direction to expose the lower semiconductor layer. The indents have distal ends spaced apart from each other. Meanwhile, a lower electrode is formed on the exposed region of the lower semiconductor layer corresponding to the first corner of the substrate, and an upper electrode is formed on a transparent electrode layer on the semiconductor layer. Lower extensions extending from the lower electrode are formed on the exposed edge regions of the lower semiconductor layer and on the regions of the lower semiconductor layer exposed through the indents. An upper extension extending from the upper electrode are formed on the transparent electrode layer. The lower and upper extensions improve current spreading, particularly, in a light emitting diode with a large area.
摘要:
There is provided a method of fabricating a vertical light emitting diode. The method comprises the steps of: growing a low doped first conductive semiconductor layer on a sacrificial substrate; forming an aluminum layer on the low doped first conductive semiconductor layer; forming an AAO layer having a large number of holes formed therein by performing anodizing treatment of the aluminum layer; etching and patterning the low doped first conductive semiconductor layer using the aluminum layer with a large number of the holes as a shadow mask to expose a portion of the low doped first conductive semiconductor layer, thereby forming a large number of grooves; removing the aluminum layer remaining on the low doped first conductive semiconductor layer; sequentially forming a high doped first conductive semiconductor layer, an active layer and a second conductive semiconductor layer on the low doped first conductive semiconductor layer with a large number of the grooves; forming a metal reflective layer and a conductive substrate on the second conductive semiconductor layer; separating the sacrificial substrate; and forming an electrode pad on the other surface of the low doped first conductive semiconductor layer, the electrode pad being filled in a large number of the grooves to be in ohmic contact with the high doped first conductive semiconductor layer
摘要:
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.