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Title:
LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, ILLUMINATION DEVICE, ILLUMINATION SYSTEM, AND GUIDE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/103732
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a light-emitting element with excellent lifespan. The light-emitting element comprises a first electrode , a second electrode , and an EL layer, and the light-emitting element has a configuration in which: the EL layer has a hole injection layer, and first to fourth layers; the hole injection layer has an organic acceptor and is positioned between the first electrode and the first layer; the first layer has a first hole transport material; the second layer has a second hole transport material and is positioned between the first layer and the third layer; the third layer has a third hole transport material; the fourth layer has 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 lower than the HOMO level of the first hole transport material; the HOMO level of the host material is lower than the HOMO level of the second hole transport material; the HOMO level of the third hole transport material is the same as or lower than the HOMO level of the host material; the difference between the HOMO level of the second hole transport material and the HOMO level of the third hole transport material is 0.3 eV or less; and the second hole transport material is a triarylamine compound with a structure in which a dibenzofuran skeleton or a dibenzothiophene skeleton is bound directly or via a bivalent aromatic hydrocarbon group to a nitrogen of the amine.

Inventors:
TAKITA YUSUKE (JP)
SEO SATOSHI (JP)
SUZUKI TSUNENORI (JP)
OSAKA HARUE (JP)
Application Number:
PCT/IB2016/057370
Publication Date:
June 22, 2017
Filing Date:
December 06, 2016
Export Citation:
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Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01L51/50; C07D333/76; C09K11/06; H05B37/02; H05B44/00
Domestic Patent References:
WO2011059099A12011-05-19
WO2015182887A12015-12-03
WO2014067614A12014-05-08
Foreign References:
JP2013258022A2013-12-26
JP2011009498A2011-01-13
JP2011139044A2011-07-14
JP2015144233A2015-08-06
JP2013509712A2013-03-14
JP2007156651A2007-06-21
JP2016076566A2016-05-12
JP2016100376A2016-05-30
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