Organic electroluminescent device
US6316874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Feb 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/80
Abstract
The object of the invention is to provide an organic EL device which possesses the merits of both an organic material and an inorganic material, has an extended life, an improved efficiency, a low driving voltage and high luminance, and is fabricated at low cost. This object is achieved by the provision of an organic EL device comprising a substrate, a hole injecting electrode and a cathode formed on the substrate, and at least one organic layer located between these electrodes. An inorganic insulating electron injecting layer is located between the cathode and the organic layer. The inorganic insulating electron injecting layer comprises as an oxide having a low work function at least one oxide having a work function of lower than 2.5 eV, and as an oxide having a high work function at one oxide having a work function of 2.5 to 4 eV.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.