???Y represents a carbonyl (C???O) group; (C(CN)2) group; L1, L2, and L3 represent methine groups, wherein the methine groups may be members of a 5 or 6-membered ring when m is equal to or >1 m is 0, 1, 2, or 3; W is an aryl group; and D is a moiety in conjugation with the X and Y groups, with the proviso that D is not a hemicyanine moiety. 2.