Non-aqueous ink compositions containing transition metal complexes, and uses thereof in organic electronics

A non-aqueous ink composition for use in preparing a hole carrying film which is a hole injection layer (HIL) or a hole transport layer (HTL) and not for use in preparing an emission layer (EML) comprising:

• (a) a polythiophene comprising a repeating unit complying with formula (I)
• wherein R1 and R2 are each, independently, H, alkyl, fluoroalkyl, alkoxy, aryloxy, or —O—[Z—O]p—Re;
• wherein
• Z is an optionally halogenated hydrocarbylene group,
• p is equal to or greater than 1, and
• Re is H, alkyl, fluoroalkyl, or aryl;
• (b) a transition metal complex having a ligand consisting essentially of one or more β-diketonate ligands, or consisting of one or more β-diketonate ligands and one or more ligands other than β-diketonate ligand, and the one or more ligands other than β-diketonate ligand are selected from the group consisting of inorganic ligands, cyanide (CN), carbonyl (CO), thiocyanato (SCN), aminoacids, iminoacetonates, ethylenediamines and amidinate;
• and
• (c) a liquid carrier comprising one or more organic solvents, and
• wherein the components of the composition including (a) the polythiophene, (b) the transition metal complex, and (c) the liquid carrier are selected to provide the hole carrying film which is a hole injection layer (HIL) or a hole transport layer (HTL) and not provide for the emission layer (EML).