Abstract: Disclosed is a carbon dioxide absorbent and a carbon dioxide separation method using the same that greatly reduces energy consumption due to a small amount of latent heat required in regeneration of absorbents, enhances CO2 absorption rate, undergoes almost no thermal denaturation even at high temperatures while absorbing carbon dioxide, and results in a considerable reduction of the cost associated with absorption of carbon dioxide.

Abstract: Disclosed is a carbon dioxide absorbent and a carbon dioxide separation method using the same that greatly reduces energy consumption due to a small amount of latent heat required in regeneration of absorbents, enhances CO2 absorption rate, undergoes almost no thermal denaturation even at high temperatures while absorbing carbon dioxide, and results in a considerable reduction of the cost associated with absorption of carbon dioxide.

Abstract: A light emitting diode includes: a first conductivity type semiconductor layer; a mesa including an active layer and a second conductivity type semiconductor layer, the mesa having a groove disposed under some region of the first conductivity type semiconductor layer to expose an edge of the first conductivity type semiconductor layer, the groove exposing the first conductivity type semiconductor layer; a first electrode including a first contact portion electrically connected to the first conductivity type semiconductor layer through the groove; a second electrode disposed between the first electrode and the second conductivity type semiconductor layer and electrically connected to the second conductivity type semiconductor layer; and an upper electrode pad disposed adjacent to the first conductivity type semiconductor layer and connected to the second electrode, wherein the groove has a shape surrounding a region including a center of the mesa and partially open.

Abstract: A light emitting diode includes: a first conductivity type semiconductor layer; a mesa including an active layer and a second conductivity type semiconductor layer, the mesa having a groove disposed under some region of the first conductivity type semiconductor layer to expose an edge of the first conductivity type semiconductor layer, the groove exposing the first conductivity type semiconductor layer; a first electrode including a first contact portion electrically connected to the first conductivity type semiconductor layer through the groove; a second electrode disposed between the first electrode and the second conductivity type semiconductor layer and electrically connected to the second conductivity type semiconductor layer; and an upper electrode pad disposed adjacent to the first conductivity type semiconductor layer and connected to the second electrode, wherein the groove has a shape surrounding a region including a center of the mesa and partially open.

Abstract: Disclosed is a light-emitting device.

Abstract: A light emitting diode includes: a first conductivity type semiconductor layer; a mesa including an active layer and a second conductivity type semiconductor layer, the mesa having a groove disposed under some region of the first conductivity type semiconductor layer to expose an edge of the first conductivity type semiconductor layer, the groove exposing the first conductivity type semiconductor layer; a first electrode including a first contact portion electrically connected to the first conductivity type semiconductor layer through the groove; a second electrode disposed between the first electrode and the second conductivity type semiconductor layer and electrically connected to the second conductivity type semiconductor layer; and an upper electrode pad disposed adjacent to the first conductivity type semiconductor layer and connected to the second electrode, wherein the groove has a shape surrounding a region including a center of the mesa and partially open.

Abstract: A light emitting diode including a semiconductor stack including a lower semiconductor layer, an active layer, and an upper semiconductor layer; an upper electrode connected to the upper semiconductor layer and including an electrode pad and extensions extending from the electrode pad; and a lower electrode connected to the lower semiconductor layer. The electrode pad includes a first electrode pad having an elongated shape, disposed along a first side of the upper semiconductor layer, and covering the upper semiconductor layer near the first side of the upper semiconductor layer, and the extensions include an edge extension extending along an edge of the upper semiconductor layer in the electrode pad and surrounding a luminous region and middle extensions extending from the edge extension or the electrode pad and dividing the luminous region into a plurality of luminous regions.

Abstract: Exemplary embodiments of the present invention relate to a high-efficiency light emitting diode (LED).

Abstract: Disclosed herein is a vertical type light emitting diode having a mesa including a groove.

Abstract: A light emitting diode includes a support substrate; a light emitting structure including a second semiconductor layer, an active layer, and a first semiconductor layer; at least one groove formed on the lower surface of the light emitting structure; a second electrode located on at least the lower surface of the second semiconductor layer, and electrically connected with the second semiconductor layer; an insulating layer partially covering the second electrode and the lower surface of the light emitting structure, and including at least one opening corresponding to the at least one groove; and a first electrode electrically connected to the first semiconductor layer exposed to the at least one groove, and at least partially covering the insulating layer, wherein the second electrode includes a second contact layer including an ohmic contact layer, and the ohmic contact layer is disposed in the shape of a plurality of islands.

Abstract: The present invention relates to a system and a method therefor capable of reducing the amount of heat which must be supplied to a regeneration tower for regenerating an absorbent in an acid gas capture system for such acid gas as carbon dioxide, and provides an acid gas capture system and an acid gas capture method capable of reducing energy consumption by using the heat from the system itself in an acid gas capture system. The system and method according to the present invention have the benefit of saving energy by lowering the thermal demand of a reboiler by using the low-temperature steam condensate generated in the capture system to cool the upper end of the regeneration tower and a steam generator and compressor.

Abstract: The present invention relates to an acid gas capture system and method which can reduce the energy consumption by using the heat from the system itself of an acid gas capture system. The system and method according to the present invention causes heat exchange to occur between an absorbent discharged from the upper part of an absorption tower of the capture system and a mixed gas comprising an acid gas, and a portion of an absorbent solution which has absorbed the acid gas discharged from the lower part of the absorption tower, and additionally, the remaining absorbent solution excluding said portion thereof undergoes heat exchange with the regenerated high-temperature absorbent solution discharged from the reboiler to preheat the absorbent solution supplied to the regeneration tower, thereby reducing the thermal energy required by same.

Abstract: Disclosed is a light-emitting device.

Abstract: A light emitting diode including a semiconductor stack including a lower semiconductor layer, an active layer, and an upper semiconductor layer; an upper electrode connected to the upper semiconductor layer and including an electrode pad and extensions extending from the electrode pad; and a lower electrode connected to the lower semiconductor layer. The electrode pad includes a first electrode pad having an elongated shape, disposed along a first side of the upper semiconductor layer, and covering the upper semiconductor layer near the first side of the upper semiconductor layer, and the extensions include an edge extension extending along an edge of the upper semiconductor layer in the electrode pad and surrounding a luminous region and middle extensions extending from the edge extension or the electrode pad and dividing the luminous region into a plurality of luminous regions.

Abstract: A light emitting diode includes a support substrate; a light emitting structure including a second semiconductor layer, an active layer, and a first semiconductor layer; at least one groove formed on the lower surface of the light emitting structure; a second electrode located on at least the lower surface of the second semiconductor layer, and electrically connected with the second semiconductor layer; an insulating layer partially covering the second electrode and the lower surface of the light emitting structure, and including at least one opening corresponding to the at least one groove; and a first electrode electrically connected to the first semiconductor layer exposed to the at least one groove, and at least partially covering the insulating layer, wherein the second electrode includes a second contact layer including an ohmic contact layer, and the ohmic contact layer is disposed in the shape of a plurality of islands.

Abstract: The present invention relates to a system and a method therefor capable of reducing the amount of heat which must be supplied to a regeneration tower for regenerating an absorbent in an acid gas capture process for such acid gas as carbon dioxide and provides a low energy-type acid gas capture system and method using recirculation of an absorbent capable of reducing energy consumption by recirculating the absorbent, from which acid gas has been pre-separated, to an absorption tower before supplying the absorbent to the regeneration tower in an acid gas capture system.

Abstract: Disclosed is a system and method of separating and collecting acid gas such as carbon dioxide in which the energy consumption in a stripping column for regenerating an absorbent may be reduced. In the system and method, the energy consumption may be reduced using heat generated during the acidic gas separation and collection processes. In the system and method, a low-temperature condensate from a condenser may be preheated by heat exchange with a high-temperature processed gas, and then supplied into the stripping column, thereby to reduce the heat duty of a reboiler and the energy consumption in the condenser for cooling. A partial flow of a carbon diode-absorbed absorbent from an absorber column may be preheated by heat exchange with high-temperature processed gas from an upper portion of the stripping column, and then supplied into the stripping column, thereby to further reduce the heat duty of the reboiler.

Abstract: The present invention relates to a system and a method therefor capable of reducing the amount of heat which must be supplied to a regeneration tower for regenerating an absorbent in an acid gas capture process for such acid gas as carbon dioxide and provides a low energy-type acid gas capture system and method using recirculation of an absorbent capable of reducing energy consumption by recirculating the absorbent, from which acid gas has been pre-separated, to an absorption tower before supplying the absorbent to the regeneration tower in an acid gas capture system.

Abstract: Provided is a system and method in which a heat amount to be supplied to a regeneration tower for regenerating an absorbent may be lowered in an acidic gas capturing system for capturing acidic gas such as carbon dioxide. According to the system and method of capturing acidic gas, heat generated in the system itself is used to reduce energy consumption. According to the system and method of the inventive concept, heat exchange is conducted between low-temperature separated water generated in a capturing process and high-temperature processing gas to thereby reduce a cooling capacity of a condenser when condensing the processing gas, and also, a reboiler heat duty may be lowered by introducing the low-temperature separated water in a preheated state into the regeneration tower.

Abstract: The present invention relates to a system and a method therefor capable of reducing the amount of heat which must be supplied to a regeneration tower for regenerating an absorbent in an acid gas capture system for such acid gas as carbon dioxide, and provides an acid gas capture system and an acid gas capture method capable of reducing energy consumption by using the heat from the system itself in an acid gas capture system. The system and method according to the present invention have the benefit of saving energy by lowering the thermal demand of a reboiler by using the low-temperature steam condensate generated in the capture system to cool the upper end of the regeneration tower and a steam generator and compressor.