Invention Grant
US09209415B2 Light-emitting element with multiple light-emitting layers having controlled carrier mobility and lighting device and electronic device using the same
有权
具有多个具有受控载波移动性的发光层和照明装置的发光元件以及使用该发光元件的电子装置
- Patent Title: Light-emitting element with multiple light-emitting layers having controlled carrier mobility and lighting device and electronic device using the same
- Patent Title (中): 具有多个具有受控载波移动性的发光层和照明装置的发光元件以及使用该发光元件的电子装置
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Application No.: US12873544Application Date: 2010-09-01
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Publication No.: US09209415B2Publication Date: 2015-12-08
- Inventor: Satoko Shitagaki , Satoshi Seo
- Applicant: Satoko Shitagaki , 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: JP2009-205300 20090904
- Main IPC: H01L51/54
- IPC: H01L51/54 ; H01L51/50 ; H01L51/00

Abstract:
Disclosed is a light-emitting element which includes a first light-emitting layer over and in contact with a hole-transport layer and a second light-emitting layer over and in contact with the first light-emitting layer. The first and the second light-emitting layers contain a bipolar host material and an emissive guest material. The guest material in the first light-emitting layer has a lower ability for capturing a hole than a guest material in the second light-emitting layer; therefore, the hole-transport property of the first light-emitting layer can be controlled to be higher than that of the second light-emitting layer. The difference in hole-transport property between the first and second light-emitting layers allows a recombination region to be widely spread in the light-emitting layers. An anti-reducing material may be provided in the hole-transport layer, which prevents the hole-transport layer from being reduced by electrons which fail to undergo recombination in the light-emitting layers.
Public/Granted literature
- US20110057178A1 Light-Emitting Element, Light-Emitting Device, and Method for Manufacturing the Same Public/Granted day:2011-03-10
Information query
IPC分类: