发明授权
- 专利标题: Light emitting device having a plurality of light emitting cells and method of fabricating the same
- 专利标题(中): 具有多个发光单元的发光器件及其制造方法
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申请号: US11815255申请日: 2005-07-05
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公开(公告)号: US07772601B2公开(公告)日: 2010-08-10
- 发明人: Chung Hoon Lee , Hong San Kim , James S. Speck
- 申请人: Chung Hoon Lee , Hong San Kim , James S. Speck
- 申请人地址: KR Ansan-si
- 专利权人: Seoul Opto Device Co., Ltd.
- 当前专利权人: Seoul Opto Device Co., Ltd.
- 当前专利权人地址: KR Ansan-si
- 代理机构: H.C. Park & Associates, PLC
- 优先权: KR10-2005-0010349 20050204; KR10-2005-0010978 20050205; KR10-2005-0023185 20050321
- 国际申请: PCT/KR2005/002124 WO 20050705
- 国际公布: WO2005/083065 WO 20060810
- 主分类号: H01L33/00
- IPC分类号: H01L33/00
摘要:
Disclosed is a light emitting device having a plurality of light emitting cells. The light emitting device comprises a thermally conductive substrate, such as a SiC substrate, having a thermal conductivity higher than that of a sapphire substrate. The plurality of light emitting cells are connected in series on the thermally conductive substrate. Meanwhile, a semi-insulating buffer layer is interposed between the thermally conductive substrate and the light emitting cells. For example, the semi-insulating buffer layer may be formed of AlN or semi-insulating GaN. Since the thermally conductive substrate having a thermal conductivity higher than that of a sapphire substrate is employed, heat-dissipating performance can be enhanced as compared with a conventional sapphire substrate, thereby increasing the maximum light output of a light emitting device that is driven under a high voltage AC power source. In addition, since the semi-insulating buffer layer is employed, it is possible to prevent an increase in a leakage current through the thermally conductive substrate and between the light emitting cells.