Light-emitting element, light-emitting device, lighting device, and electronic device
US8207540B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2011 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Jul 1, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/40
Abstract
An object is to provide a light-emitting element which exhibits light emission with high luminance and can be driven at low voltage. Another object is to provide a light-emitting device or an electronic device with reduced power consumption. Between an anode and a cathode, n (n is a natural number of two or more) EL layers are provided, where between a first EL layer and a second EL layer, a first layer containing any of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound, a second layer containing a material having a high electron-transporting property in contact with the first layer, and a region containing a material having a high hole-transporting property and an acceptor material in contact with the second layer are provided in this order from the anode side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.