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1. (WO2017155294) LIGHT EMITTING DEVICE

Pub. No.:    WO/2017/155294    International Application No.:    PCT/KR2017/002487
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Mar 09 00:59:59 CET 2017
IPC: H01L 33/36
H01L 33/40
H01L 33/38
H01L 33/62
Applicants: LG INNOTEK CO., LTD.
엘지이노텍 주식회사
Inventors: CHOI, Kwang Yong
최광용
KIM, Min Sung
김민성
PARK, Su Ik
박수익
SUNG, Youn Joon
성연준
LEE, Yong Gyeong
이용경
Title: LIGHT EMITTING DEVICE
Abstract:
An embodiment of the present invention relates to a light emitting device capable of enhancing ohmic characteristics of a semiconductor layer and an electrode and simultaneously improving driving voltage, comprising: a support substrate; a light emitting structure which is disposed on the support substrate and comprises a first semiconductor layer, a second semiconductor layer and an active layer disposed between the first semiconductor layer and the second semiconductor layer; at least one groove which exposes the first semiconductor layer through the second semiconductor layer and the active layer; a first electrode which is disposed between the light emitting structure and the support substrate and electrically connected to the exposed first semiconductor layer; a second electrode which comprises ITO and contacts the second semiconductor layer; and a capping layer which is electrically connected, between the first electrode and the light emitting structure, to the second electrode, wherein the capping layer comprises a first layer, which is disposed facing the second semiconductor layer, with the second electrode interposed therebetween and comprises a material having a thermal expansion coefficient different from the thermal expansion coefficient of the second semiconductor layer by 3 or less.