- 专利标题: Light-emitting element, light-emitting device, electronic appliance, and lighting device
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申请号: US15178638申请日: 2016-06-10
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公开(公告)号: US09941483B2公开(公告)日: 2018-04-10
- 发明人: Takuya Kawata , Nobuharu Ohsawa , Yusuke Nonaka , Takahiro Ishisone , Satoshi Seo
- 申请人: Semiconductor Energy Laboratory Co., Ltd.
- 申请人地址: JP Atsugi-shi, Kanagawa-ken
- 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 Atsugi-shi, Kanagawa-ken
- 代理机构: Fish & Richardson P.C.
- 优先权: JP2013-249206 20131202; JP2014-101046 20140515
- 主分类号: H01L51/00
- IPC分类号: H01L51/00 ; H01L51/50
摘要:
A light-emitting element includes a stack of a first light-emitting layer emitting fluorescent light and a second light-emitting layer emitting phosphorescent light between a pair of electrodes. The second light-emitting layer includes a first layer in which an exciplex is formed, a second layer in which an exciplex is formed, and a third layer in which an exciplex is formed. The second layer is located over the first layer, and the third layer is located over the second layer. An emission peak wavelength of the second layer is longer than an emission peak wavelength of the first layer and an emission peak wavelength of the third layer.
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