发明授权
- 专利标题： Light-emitting element, light-emitting device, display device, electronic appliance, and lighting device
- 专利标题（中）： 发光元件，发光装置，显示装置，电子设备和照明装置
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申请号： US13804508申请日： 2013-03-14
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公开(公告)号： US09299942B2公开(公告)日： 2016-03-29
- 发明人: Hiromi Seo , Satoshi Seo
- 申请人： Semiconductor Energy Laboratory Co., Ltd.
- 申请人地址： JP
- 专利权人： Semiconductor Energy Laboratory Co., Ltd.
- 当前专利权人： Semiconductor Energy Laboratory Co., Ltd.
- 当前专利权人地址： JP
- 代理机构： Husch Blackwell LLP
- 优先权： JP2012-081141 20120330
- 主分类号： H01L51/50
- IPC分类号： H01L51/50
摘要：
Provided is a light-emitting element with a small degree of luminance degradation with accumulation of driving time (a long-lifetime light-emitting element). Provided is a light-emitting element in which a light-emitting layer with an electron-transport property is formed with a plurality of layers containing different host materials. Further, the LUMO level of a host material on an anode side is higher than the LUMO level of a host material on a cathode side. With such a structure, it is possible to provide a long-lifetime light-emitting element with little degradation in luminance with accumulation of driving time.
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