Organic light-emitting devices with multiple hole injection layers containing fullerene
US7358538B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 28, 2005 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Feb 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K85/633
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
The present invention provides layered hole injection structures including one or more layers of fullerenes for application in an organic electroluminescent device. The layered structures include a bi-layered structure including an electrically conductive layer serving as electrical contact to external circuit and a fullerene layer sandwiched between the conductive layer and a hole transport layer. The layered structure may also includes a tri-layered structure stacked sequentially including a first electrically conductive layer, a fullerene layer and a hole injection layer material selected from thermally stable molecules such as CuPc. The layered structure may also include a four-layered structure stacked sequentially including a first electrically conductive layer, a fullerene layer on the conductive layer, a noble metal layer on the fullerene layer and another fullerene layer on the noble metal layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.