Invention Grant
- Patent Title: Light-emitting element, display module, lighting module, light-emitting device, display device, electronic appliance, and lighting device
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Application No.: US15983223Application Date: 2018-05-18
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Publication No.: US10374186B2Publication Date: 2019-08-06
- Inventor: Nobuharu Ohsawa , Yusuke Nonaka , Takahiro Ishisone , Satoshi Seo , Takuya Kawata
- 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: JP2013-249486 20131202; JP2014-097803 20140509; JP2014-180913 20140905
- Main IPC: H01L51/50
- IPC: H01L51/50 ; H01L27/32 ; H01L51/00

Abstract:
An object of one embodiment of the present invention is to provide a multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance, a separation layer containing a substance having a hole-transport property and a substance having an electron-transport property, and a second light-emitting layer containing two kinds of organic compounds that form an exciplex and a substance that can convert triplet excitation energy into luminescence. Note that a light-emitting element in which light emitted from the first light-emitting layer has an emission spectrum peak on the shorter wavelength side than an emission spectrum peak of the second light-emitting layer is more effective.
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