Lg Innotek Co., Ltd.

Osong Medical Innovation Foundation, Korea University Research and Business Foundation

Jong Sub Lee

Hyun Don Song

Sung Dal Jung

Seung Hwan Kim

Ki Man Kang

Seung Yong Shin

Gyu Seong Woo

An embodiment of the present invention includes: a gallium nitride substrate; and a light-emitting structure disposed on the other surface of the substrate, wherein the substrate includes a plurality of light extraction structures formed on one surface thereof, the thickness of the substrate is 80 &#x3bc;m or more, and the average height of the plurality of light extraction structures is 10 &#x3bc;m or more.

Light emitting device

Disclosed in an embodiment is a light emitting device comprising: a substrate; a light emitting structure, which includes a first semiconductor layer, an active layer, a second semiconductor layer, and a first groove penetrating through the second semiconductor layer and the active layer and disposed up until a partial region of the first semiconductor layer; a reflective electrode layer covering a lower part of the second semiconductor layer and a sidewalls of the first groove; a first ohmic electrode disposed inside the first groove and electrically connected to the first semiconductor layer; and a first insulation layer for electrically insulating the first ohmic electrode and the reflective electrode layer.

Light emitting device having gallium nitrade substrate

The present invention relates to a device for measuring a suspension in a drilling fluid and a thickness of slime at the bottom of a pile borehole, the device including: a data cableinsertable into the pile borehole; a slime-meter probeconnected to one end of the data cablein such a manner as to be descended to the interior of the pile borehole by the own weight thereof to measure the thickness of the slime at the bottom of the pile borehole; and a slime-meter outer partmounted on the outside of the slime-meter probein such a manner as to be movable relatively to the slime-meter probewhen reaches the bottom of the pile borehole.

Device for measuring suspension in drilling fluid and thickness of slime at the bottom of pile borehole

A light emitting device is provided that may include a substrate, a light emitting structure including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer provided on the substrate, a first electrode on the first conductive semiconductor layer, and a schottky guide ring configured to surround the first electrode and directly connect with the first conductive semiconductor layer.

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Seoul, South Korea

Jong Sub Lee