Invention Application
- Patent Title: Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
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Application No.: US16183838Application Date: 2018-11-08
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Publication No.: US20190088897A1Publication Date: 2019-03-21
- Inventor: Satoshi SEO , Tsunenori SUZUKI , Satoko SHITAGAKI
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Priority: JP2009-273987 20091201
- Main IPC: H01L51/50
- IPC: H01L51/50 ; H01L51/00

Abstract:
Objects of the present invention are to provide: a light-emitting element having a long lifetime and good emission efficiency and drive voltage. One embodiment of the invention is a light-emitting element including, between an anode and a cathode, at least a stack structure in which a first layer, a second layer, and a light-emitting layer are provided in order from the anode side. The first layer includes a first organic compound and an electron-accepting compound. The second layer includes a second organic compound having a HOMO level differing from the HOMO level of the first organic compound by from −0.2 eV to +0.2 eV. The light-emitting layer includes a third organic compound having a HOMO level differing from the HOMO level of the second organic compound by from −0.2 eV to +0.2 eV and a light-emitting substance having a hole-trapping property with respect to the third organic compound.
Information query
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