Patent ID: 6881840

Claim:
A dye represented by Formulae II and IIA below: wherein; R 1 represents a hydrogen, an aryl group containing 6 to 14 carbon atoms, or an alkyl group containing 1 to 12 carbon atoms; R 2 and R 3 together form an aromatic, carbocyclic or heterocyclic ring system containing 6 to 14 atoms; “X represents a sulfone (SO 2 ) group;” “Y represents a carbonyl (C═O) group; (C(CN) 2 ) group; L 1 , L 2 , and L 3 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.