Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic device, and lighting device comprising a phthalocyanine-based material
- Patent Title (中): 发光元件,发光装置,电子装置以及包含酞菁类材料的照明装置
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Application No.: US13072908Application Date: 2011-03-28
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Publication No.: US09276221B2Publication Date: 2016-03-01
- Inventor: Hiromi Nowatari , Satoshi Seo
- Applicant: Hiromi Nowatari , Satoshi Seo
- Applicant Address: JP
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP
- Agency: Husch Blackwell LLP
- Priority: JP2010-082706 20100331
- Main IPC: H01L51/54
- IPC: H01L51/54 ; H01L51/00 ; H01L51/50

Abstract:
A light-emitting element that emits light with high luminance and can be driven at low voltage. The light-emitting element includes n (n is a natural number greater than or equal to 2) EL layers between an anode and a cathode, and includes a first layer, a second layer, and a third layer between an m-th (m is a natural number, 1≦m≦n−1) EL layer from the anode and an (m+1)th EL layer. The first layer functions as a charge-generation region, has hole-transport properties, and contains an acceptor substance. The third layer has electron-transport properties and contains an alkali metal or the like. The second layer is formed of a phthalocyanine-based material and is provided between the first layer and the third layer, whereby an injection barrier at the time of injecting electrons generated in the first layer into the m-th EL layer through the third layer can be lowered.
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