Polythiophene compositions for improving organic light-emitting diode

A process for preparing a composition, said composition comprising:

• (a) at least one polythiophene consisting of repeating units of the general formula (I-a), or of the general formula (I-b) or of the general formula (I-a) and (I-b)
• wherein,
• R1 denotes
• —(CH2)s—O—(CH2)p—R3,
• where
• R3 denotes SO3−M+ or COO−M+,
• where M+ denotes H+, Li+, Na+, K+, Rb+, Cs+ or NH4+,
• s is an integer from 0 to 10,
• p is an integer from 1 to 18,
• R2 independently of R1 denotes a member selected from the group consisting of H, a linear or branched C1-C20-alkyl radical, a C6-C14-aryl radical, —(CH2)s—O—(CH2)p—R3 and —(CH2)q—O—(CH2CH2O)rR4,
• where R3, s and p have the meanings given for R1,
• R4 denotes C1-C4-alkyl,
• q denotes an integer from 0 to 10, and
• r denotes an integer from 1 to 12,
• and
• (b) at least one further polymer, that is different than said polythiophene (a) wherein said further polymer represents (i) a partially fluorinated or perfluorinated polymer comprising SO3−M+ groups or (ii) a partially fluorinated or perfluorinated polymer comprising COO−M+ groups or (iii) a salt of (i) or (ii), in which M+ in each case denotes a member selected independently from the group consisting of H+, Na+, K+, Rb+, Cs+ or NH4+
• wherein said process comprises
• mixing the at least one polythiophene with the at least one further polymer and optionally adding at least one solvent to this mixture;
• or
• dissolving the at least one polythiophene in at least one diluent and dissolving the at least one further polymer in at least one diluent and mixing these two solutions;
• or
• producing the at least one polythiophene by polymerisation of the corresponding monomeric compounds with at least one suitable oxidising agent in at least one suitable solvent, wherein an exchange of solvent or addition of further solvents may take place after completion of the polymerisation, and mixing the polythiophene solution with the at least one further polymer, the further polymer optionally being dissolved in at least one diluent.