Light-emitting element, light-emitting device, electronic device, and lighting device
US9548468B2 · kind B2 · utility
23Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | May 29, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Emission efficiency of a light-emitting element is improved. The light-emitting element has a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer includes a fluorescent material and a host material. The second light-emitting layer includes a phosphorescent material, a first organic compound, and a second organic compound. An emission spectrum of the second light-emitting layer has a peak in a yellow wavelength region. The first organic compound and the second organic compound form an exciplex.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.