Light-emitting element and light-emitting device
US7528541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2004 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Jan 31, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/917
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
Organic materials doped with alkali metal have been conventionally used for electron transport layers or electron injection layers which constitute light-emitting films in organic EL light-emitting elements which are used in display devices or illuminating devices. Such conventional organic materials involve problems such that a strict process control is required since the alkali metal is highly reactive and thus, likely to be formed into a hydroxide, such that the resulting light-emitting element or light-emitting device needs complete sealing, and such that life of the light-emitting element cannot be sufficiently long. The present invention uses an alkali metal-including fullerene or an organic material doped with an alkali metal-including fullerene for electron transport layers or electron injection layers which constitute light-emitting films in organic EL light-emitting elements. The alkali metal-including fullerene or the organic material doped with an alkali metal-including fullerene is not very reactive with moisture or other impurities in the atmosphere and thus, the process control thereof is easy. Furthermore, even with a simple sealing structure, the resulting light-em…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.