Abstract:
A method of manufacturing a gallium nitride (GaN)-based semiconductor light emitting device is provided. A light emitting structure is formed and includes an n-type semiconductor layer, an active layer and a p-type semiconductor layer formed of a nitride semiconductor containing gallium (Ga) on a substrate. A metal layer is disposed on the p-type semiconductor layer, and a heat treatment is performed to form a gallium(Ga)-metal compound. The gallium(Ga)-metal compound formed on the p-type semiconductor layer is removed. An electrode is disposed on an upper surface of the p-type semiconductor layer from which the gallium(Ga)-metal compound has been removed. The forming of the gallium(Ga)-metal compound includes forming a gallium vacancy in a surface of the p-type semiconductor layer.
Abstract:
An air conditioner including a distributor configured to distribute a fluid to a heat exchanger. The distributor comprises a main pipe; a partition defining a plurality of distribution paths in the main pipe; a first branched pipe inserted into the main pipe as much as first length, linked to a first distribution path of the plurality of distribution paths, connected to a first portion of the heat exchanger; and a second branched pipe inserted into the main pipe as much as second length different from the first length, linked to the first distribution path, connected to a second portion of the heat exchanger. A flow velocity of air exchanging heat at the first portion of the heat exchanger is faster than a flow velocity of air exchanging heat at the second portion of the heat exchanger. The first length is shorter than the second length.
Abstract:
A semiconductor light emitting device includes: a light emitting structure including a first conductivity-type semiconductor layer, a second conductivity-type semiconductor layer, and an active layer disposed therebetween; a first electrode disposed on the light emitting structure to be electrically connected to the first conductivity-type semiconductor layer; and a second electrode disposed on the light emitting structure to be electrically connected to the second conductivity-type semiconductor layer. The second electrode includes a first layer disposed on the second conductivity-type semiconductor layer, and a second layer disposed on the first layer, having a sheet resistance higher than that of the first layer, and having a thickness less than that of the first layer.
Abstract:
The present disclosure relates to a heat exchanger and an air conditioner including the same. The heat exchanger may be provided for heat exchange between refrigerant and air. The heat exchanger may include a plurality of refrigerant tubes that are disposed with a clearance (C) therebetween in a first direction (A), in which the air moves, and are disposed to be spaced apart in a second direction (B) crossing the first direction (A) and a plurality of heat exchange fins that are disposed between the plurality of refrigerant tubes disposed to be spaced apart in the second direction (B).
Abstract:
The present disclosure relates to a heat exchanger and an air conditioner improving heat exchange ability by optimizing the number of high protrusions of a heat transfer tube and a height difference between the high protrusion and a low protrusion to increase the heat transfer performance of the heat transfer tube or reduce the pressure loss in the tube. An air conditioner includes the heat exchanger including a heat transfer tube configured to allow the refrigerant to flow, fins installed on the heat transfer tube, and fin collars forming an insertion hole through which the heat transfer tube is inserted and passes, and the fin collars is in contact with the heat transfer tube by tube expansion of the heat transfer tube. The heat transfer tube includes high protrusions disposed in a spiral shape with respect to a tube axis direction of the heat transfer tube, twenty one to twenty seven of the high protrusions being formed along a circumferential direction of the heat transfer tube, and low protrusions disposed between two of the adjacent high protrusions along the circumferential direction of the heat transfer tube and having a height lower by 0.03 mm to 0.05 mm than the high protrusions.