Light-emitting element, display device, electronic device, and lighting device
US11133482B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2019 |
| Grant date | Sep 28, 2021 |
| Priority date | — |
| Expiry date | Feb 6, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/90
Abstract
Provided is a light-emitting element including a fluorescence-emitting material with high emission efficiency. The light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first organic compound, a second organic compound, and a guest material. The first organic compound has a function of emitting a thermally activated delayed fluorescence at room temperature. The guest material has a function of emitting fluorescence. A HOMO level of the first organic compound higher than or equal to a HOMO level of the second organic compound. A LUMO level of the first organic compound is lower than or equal to a LUMO level of the second organic compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.