Charge-transporting varnish

A charge-transporting varnish characterized by comprising an aryldiamine compound of formula (1)

• (wherein R1 to R4 are each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxyl group, a thiol group, a phosphoric acid group, a sulfonic acid group, a carboxyl group, an alkoxy group of 1 to 20 carbons, a thioalkoxy group of 1 to 20 carbons, an alkyl group of 1 to 20 carbons, a haloalkyl group of 1 to 20 carbons, a cycloalkyl group of 3 to 20 carbons, a bicycloalkyl group of 6 to 20 carbons, an alkenyl group of 2 to 20 carbons, an alkynyl group of 2 to 20 carbons, an aryl group of 6 to 20 carbons, an aralkyl group of 7 to 20 carbons, or an acyl group of 1 to 20 carbons;
• R5 to R8 are each independently a hydrogen atom, a phenyl group, a naphthyl group, a pyridyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, a furanyl group, a pyrrolyl group, a pyrazolyl group, an imidazolyl group, a thienyl group (which groups may be substituted with a halogen atom, a nitro group, a cyano group, a hydroxyl group, a thiol group, a phosphoric acid group, a sulfonic acid group, a carboxyl group, an alkoxy group of 1 to 20 carbons, a thioalkoxy group of 1 to 20 carbons, an alkyl group of 1 to 20 carbons, a haloalkyl group of 1 to 20 carbons, a cycloalkyl group of 3 to 20 carbons, a bicycloalkyl group of 6 to 20 carbons, an alkenyl group of 2 to 20 carbons, an alkynyl group of 2 to 20 carbons, an aryl group of 6 to 20 carbons, an aralkyl group of 7 to 20 carbons, or an acyl group of 1 to 20 carbons), or a group of formula (2), with the proviso that at least one of R5 to R8 is a hydrogen atom,
• (R9 to R12 being each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxyl group, a thiol group, a phosphoric acid group, a sulfonic acid group, a carboxyl group, an alkoxy group of 1 to 20 carbons, a thioalkoxy group of 1 to 20 carbons, an alkyl group of 1 to 20 carbons, a haloalkyl group of 1 to 20 carbons, a cycloalkyl group of 3 to 20 carbons, a bicycloalkyl group of 6 to 20 carbons, an alkenyl group of 2 to 20 carbons, an alkynyl group of 2 to 20 carbons, an aryl group of 6 to 20 carbons, an aralkyl group of 7 to 20 carbons, or an acyl group of 1 to 20 carbons;
• and R13 and R14 being each independently a phenyl group, a naphthyl group, an anthryl group, a pyridyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, a furanyl group, a pyrrolyl group, a pyrazolyl group, an imidazolyl group, a thienyl group (which groups may mutually bond to form a ring, and may be substituted with a halogen atom, a nitro group, a cyano group, a hydroxyl group, a thiol group, a phosphoric acid group, a sulfonic acid group, a carboxyl group, an alkoxy group of 1 to 20 carbons, a thioalkoxy group of 1 to 20 carbons, an alkyl group of 1 to 20 carbons, a haloalkyl group of 1 to 20 carbons, a cycloalkyl group of 3 to 20 carbons, a bicycloalkyl group of 6 to 20 carbons, an alkenyl group of 2 to 20 carbons, an alkynyl group of 2 to 20 carbons, an aryl group of 6 to 20 carbons, an aralkyl group of 7 to 20 carbons, or an acyl group of 1 to 20 carbons));
• and
• n is an integer from 2 to 5),
• an electron-accepting dopant substance, and a solvent.