The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 2022
Filed:
Oct. 17, 2017
Merck Patent Gmbh, Darmstadt, DE;
Gaëlle Béalle, Heidelberg, DE;
Christoph Leonhard, Otzberg, DE;
Hsin-Rong Tseng, Frankfurt am Main, DE;
Manuel Hamburger, Mannheim, DE;
Anja Jatsch, Frankfurt am Main, DE;
MERCK PATENT GMBH, Darmstadt, DE;
Abstract
The present invention relates to a formulation containing at least one organic functional material and at least four different organic solvents, a first organic solvent A, a second organic solvent B, a third organic solvent C, and a fourth organic solvent D, wherein the first organic solvent A comprises a group, which is capable of receiving or giving a hydrogen bonding, the second organic solvent B has a boiling point in the range from 50 to 350° C., the third organic solvent C has a boiling point in the range from 100 to 300° C., and the fourth organic solvent D has a boiling point in the range from 200 to 400° C., is present in an amount from 0.01 to 1 vol.-% and has a viscosity of ≥15 mPas, the solubility of the at least one organic functional material in the second organic solvent B and in the fourth organic solvent D is ≥5 g/l, the boiling point of the third organic solvent C is at least 10° C. lower than the boiling point of the second organic solvent B; and the boiling point of the fourth organic solvent D is at least 10° C. higher than the boiling point of the second organic solvent B; as well as to electroluminescent devices prepared by using these formulations.