Light-emitting element, display device, electronic device, and lighting device
US10658604B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2019 |
| Grant date | May 19, 2020 |
| Priority date | — |
| Expiry date | Jul 22, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/90
Abstract
A light-emitting element having low driving voltage and high emission efficiency is provided. In the light-emitting element, a combination of a guest material and a host material forms an exciplex. The guest material is capable of converting triplet excitation energy into light emission. Light emission from the light-emitting layer includes light emission from the guest material and light emission from the exciplex. The percentage of the light emission from the exciplex to the light emission from the light-emitting layer is greater than 0 percent and less than or equal to 60 percent. The energy after subtracting the energy of light emission from the exciplex from the energy of light emission from the guest material is greater than 0 eV and less than or equal to 0.23 eV.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.