- 专利标题: LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, LIGHTING DEVICE, LIGHTING SYSTEM, AND GUIDANCE SYSTEM
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申请号: US15779661申请日: 2016-12-06
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公开(公告)号: US20180358562A1公开(公告)日: 2018-12-13
- 发明人: Yusuke TAKITA , Satoshi SEO , Tsunenori SUZUKI , Harue OSAKA
- 申请人: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 申请人地址: JP Atsugi-shi, Kanagawa-ken
- 专利权人: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 当前专利权人: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 当前专利权人地址: JP Atsugi-shi, Kanagawa-ken
- 优先权: JP2015-246311 20151217; JP2016-010274 20160122
- 国际申请: PCT/IB2016/057370 WO 20161206
- 主分类号: H01L51/00
- IPC分类号: H01L51/00 ; C07D333/76 ; H05B33/08 ; H05B37/02
摘要:
An object is to provide a light-emitting element with a favorable lifetime.A light-emitting element which includes a first electrode, a second electrode, and an EL layer and in which the EL layer includes a hole-injection layer and first to fourth layers; the hole-injection layer includes an organic acceptor and is positioned between the first electrode and the first layer; the first layer includes a first hole-transport material; the second layer includes a second hole-transport material and is positioned between the first layer and the third layer; the third layer includes a third hole-transport material; the fourth layer includes a host material and a light-emitting material and is positioned between the third layer and the second electrode; the HOMO level of the second hole-transport material is deeper than the HOMO level of the first hole-transport material; the HOMO level of the host material is deeper than the second hole-transport material HOMO level; the HOMO level of the third hole-transport material is deeper than or equal to the HOMO level of the host material; a difference between the HOMO level of the second hole-transport material and the HOMO level of the third hole-transport material is less than or equal to 0.3 eV; and the second hole-transport material is a triarylamine compound having a structure where a dibenzofuran skeleton or a dibenzothiophene skeleton is bonded to nitrogen of an amine directly or via a divalent aromatic hydrocarbon group.
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