Title:
発光装置
Document Type and Number:
Japanese Patent JP6588142
Kind Code:
B2
Abstract:
A light-emitting element which has low driving voltage and high emission efficiency is provided. The light-emitting element includes, between a pair of electrodes, a hole-transport layer and a light-emitting layer over the hole-transport layer. The light-emitting layer contains a first organic compound having an electron-transport property, a second organic compound having a hole-transport property, and a light-emitting third organic compound converting triplet excitation energy into light emission. A combination of the first organic compound and the second organic compound forms an exciplex. The hole-transport layer contains at least a fourth organic compound whose HOMO level is lower than or equal to that of the second organic compound and a fifth organic compound whose HOMO level is higher than that of the second organic compound.
Inventors:
Hiromi Seo
Tetsushi Seo
Tomoko Shimogaki
Tetsushi Seo
Tomoko Shimogaki
Application Number:
JP2018198924A
Publication Date:
October 09, 2019
Filing Date:
October 23, 2018
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
H01L51/50; C09K11/06; G09F9/30
Domestic Patent References:
| JP2006203172A | ||||
| JP2012243983A | ||||
| JP2013522864A | ||||
| JP2012186461A |
Foreign References:
| WO2011110262A1 |