Light-emitting element, comprising an organometallic complex light-emitting material, a light-emitting device and an electronic device comprising the light-emitting element
US9356250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2009 |
| Grant date | May 31, 2016 |
| Priority date | — |
| Expiry date | Aug 30, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/30
Abstract
To provide a light-emitting element with high light emission efficiency, a long lifetime, and reduced driving voltage. To provide a light-emitting element including an anode, a cathode, and a plurality of light-emitting layers which are in contact with each other so that a stacked structure is formed, between the anode and the cathode, in which the plurality of light-emitting layers are formed with a first light-emitting layer which is close to the anode and a second light-emitting layer which is close to the cathode, the first light-emitting layer and the second light-emitting layer each include a host material, a hole-transporting material, and a light-emitting material, and the concentration of the hole-transporting material in the first light-emitting layer is higher than the concentration of the hole-transporting material in the second light-emitting layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.