Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic appliance, and lighting device
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Application No.: US15900832Application Date: 2018-02-21
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Publication No.: US10439158B2Publication Date: 2019-10-08
- Inventor: Takuya Kawata , Nobuharu Ohsawa , Yusuke Nonaka , Takahiro Ishisone , Satoshi Seo
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Applicant Address: JP Atsugi-shi, Kanagawa-ken
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Atsugi-shi, Kanagawa-ken
- Agency: Fish & Richardson P.C.
- Priority: JP2013-249206 20131202; JP2014-101046 20140515
- Main IPC: H01L51/50
- IPC: H01L51/50 ; H01L51/00

Abstract:
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.
Public/Granted literature
- US20180182988A1 LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC APPLIANCE, AND LIGHTING DEVICE Public/Granted day:2018-06-28
Information query
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