Patent · US Active

Organic electroluminescent element

US7981522B2 · kind B2 · utility

8Cited by

2References

25Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Horst Vestweber · Prüm, DE
Anja Gerhard · Egelsbach, DE
Philipp Stöβel · Frankfurt, DE

Key dates

Filing date	Nov 24, 2004
Grant date	Jul 19, 2011
Priority date	—
Expiry date	Nov 8, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/917
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to the improvement of phosphorescent organic electroluminescent devices, by the use of materials of formulas (1) to (4), as indicated in diagram 1, in the hole blocking layer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.