Light emitting materials comprising novel ortho-metalated transition metal complexes
US8518557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2007 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Jan 24, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention pertains to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]2ML comprising two orthometalated ligands having imidazole moieties and an ancillary ligand of β-diketonate type. The ortho-metalated transition metal complexes are represented by formula (I):It has been surprisingly found that when the metal has bound thereto both orthometalated ligands comprising imidazole moieties and an ancillary ligand of β-diketonate type, the ligands advantageously participate in the emission process, significantly broadening emission in the visible region and enabling appreciable improvement of the white emission efficiency of complexes [C^N]2ML. Additional objects of the invention are the use of the light emitting materials and organic light emitting device comprising the light emitting material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.