Light-emitting element, light-emitting device, electronic device, and lighting device
US9935286B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2017 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Apr 18, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2102/361
Abstract
A light-emitting element of the present invention can have sufficiently high emission efficiency with a structure including a host material being able to remain chemically stable even if a phosphorescent compound having higher emission energy is used as a guest material. The relation between the relative emission intensity and the emission time of light emission obtained from the host material and the guest material contained in a light-emitting layer is represented by a multicomponent decay curve. The relative emission intensity of the slowest component of the multicomponent decay curve becomes 1/100 for a short time within a range where the slowest component is not interfered with by quenching of the host material (the emission time of the slowest component is preferably less than or equal to 15 μsec); thus, sufficiently high emission efficiency can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.