Light-emitting element
US8994263B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2012 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Jul 2, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Provided is a light-emitting element with high external quantum efficiency, or a light-emitting element with a long lifetime. The light-emitting element includes, between a pair of electrodes, a light-emitting layer including a guest material and a host material, in which an emission spectrum of the host material overlaps with an absorption spectrum of the guest material, and phosphorescence is emitted by conversion of an excitation energy of the host material into an excitation energy of the guest material. By using the overlap between the emission spectrum of the host material and the absorption spectrum of the guest material, the energy smoothly transfers from the host material to the guest material, so that the energy transfer efficiency of the light-emitting element is high. Accordingly, a light-emitting element with high external quantum efficiency can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.