Patent ID: 8288542

Claim:
A ruthenium-type sensitizer which is represented by a following chemical formula 1, comprising: wherein: ring a1 does not include any substituent or includes at least one substituent at a position of a hydrogen atom, the at least one substituent comprising a halogen atom, an amide group, a cyano group, a hydroxyl group, a nitro group, an alkoxyl group or an acyl group; ring b1 does not include any substituent or includes at least one substituent at a position of a hydrogen atom, the at least one substituent comprising a halogen atom, an amide group, a cyano group, a hydroxyl group, a nitro group, an alkoxyl group or an acyl group; and R is the same or different and each R independently includes a saturated or unsaturated alkyl group having 1 to 30 carbons which does not include any substituent or includes at least one substituent, the at least one substituent comprising a halogen atom, an amide group, a cyano group, a hydroxyl group, a nitro group, an alkoxyl group or an acyl group.