Organic electroluminescent device with improved lifetime
US6798134B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Dec 5, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/917
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an organic electroluminescent device comprising a gradual organic electroluminescent layer AxByCz inserted between an anode electrode (may include a hole injection layer) and a cathode electrode, wherein A, B, and C are mediums capable of transporting holes, transporting electrons and injecting electrons respectively, and x, y, and z denote the content of medium A, B, and C respectively. The gradual layer with different materials combined is a mixed continuous organic medium without heterojunctions, wherein the sum of x, y, and z is 100%. Moreover, x has a maximum, value adjacent to the anode electrode, and the sum of y and z has a maximum value adjacent to the cathode electrode, while the medium C is an electron injection component comprising either a low work function metal, metal compound, metal alloy, or an organic material with high electron affinity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.