Patent ID: 7795529

Claim:
A merocyanine dye having a structure represented by the general formula (II-3) or (II-4), wherein R 5 is an alkyl group, an aralkyl group, an alkenyl group, an aryl group or a heterocyclic moiety and may have a substituent; each of R 7 and R 8 is a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryloxy group, an arylthio group or a heterocyclic moiety and may have a substituent; R 9 is a substituent having an acidic group; X 4 is propane-1,3-diyl, butane-1,4-diyl or pentane-1,5-diyl; each of R 33 and R 34 is a hydrogen atom, an alkyl group or an aryl group and may have a substituent; m is 0 or 1, and a carbon-carbon double bond may be any one of E form and Z form.