Light-emitting element, display device, electronic device, and lighting device
US10224494B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2016 |
| Grant date | Mar 5, 2019 |
| Priority date | — |
| Expiry date | Mar 16, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To provide a light-emitting element with high emission efficiency and low driving voltage. The light-emitting element includes a guest material and a host material. A LUMO level of the host material is higher than a LUMO level of the host material, and a HOMO level of the guest material is lower than a HOMO level of the host material. The guest material has a function of converting triplet excitation energy into light emission. The difference between a singlet excitation energy level and a triplet excitation energy level of the host material is greater than 0 eV and less than or equal to 0.2 eV. The energy difference between the LUMO level and the HOMO level of the host material is larger than or equal to light emission energy of the guest material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.