申请人:Merck Patent GmbH
公开号:US11538992B2
公开(公告)日:2022-12-27
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.
本发明涉及一种制剂,该制剂含有至少一种有机功能材料和至少四种不同的有机溶剂,即第一种有机溶剂 A、第二种有机溶剂 B、第三种有机溶剂 C 和第四种有机溶剂 D,其中第一种有机溶剂 A 包含一个能接受或给予氢键的基团,第二种有机溶剂 B 的沸点范围为 50 至 350 摄氏度,第三种有机溶剂 C 的沸点范围为 100 至 300 摄氏度,第四种有机溶剂 D 的沸点范围为 200 至 400 摄氏度、第三种有机溶剂 C 的沸点在 100 至 300 摄氏度之间,第四种有机溶剂 D 的沸点在 200 至 400 摄氏度之间、含量为 0.01 至 1 vol.- %,粘度为 °C。至少一种有机功能材料在第二种有机溶剂 B 和第四种有机溶剂 D 中的溶解度≥5 克/升,第三种有机溶剂 C 的沸点至少比第二种有机溶剂 B 的沸点低 10 摄氏度。第四种有机溶剂 D 的沸点比第二种有机溶剂 B 的沸点高至少 10°C。