Patent ID: 8729532

Claim:
A light-absorbing material having a structure represented by Formula (1) below: X—Y (1), wherein X represents a light-absorbing site, and Y represents a radical site that becomes a radical when in an oxidized state and/or when in a reduced state, and is capable of repeated oxidation-reduction, Y in the Formula (1) is an electron acceptor for X and includes any of a bipyridinium group, a substituted bipyridinium group, a galvinoxyl radical group and a substituted galvinoxyl radical group, and X in the Formula (1) includes a structure represented by General Formula (B) below: where, in the General Formula (B), X 1 and X 2 are each independently a group including at least one of an alkyl group, an alkenyl group, an aralkyl group, an aryl group and a heterocycle, and each may be substituted, and the radical site Y binds to either of X 1 and X 2 .