发明名称 |
Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device |
摘要 |
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. |
申请公布号 |
US2017092878(A1) |
申请公布日期 |
2017.03.30 |
申请号 |
US201615377019 |
申请日期 |
2016.12.13 |
申请人 |
Semiconductor Energy Laboratory Co., Ltd. |
发明人 |
SEO Hiromi;SEO Satoshi;SHITAGAKI Satoko |
分类号 |
H01L51/00;H01L51/50 |
主分类号 |
H01L51/00 |
代理机构 |
|
代理人 |
|
主权项 |
1. (canceled) |
地址 |
Kanagawa-ken JP |