| abstract |
The present invention provides optical filters comprising a squarylium compound represented by General Formula (I): n n n n n n n n n n [wherein R 1 and R 2 may be the same or different and each represents a hydrogen atom, an alkyl group optionally having substituent(s) or the like, R 3 represents a hydrogen atom or an alkyl group optionally having substituent(s), and Y represents a group represented by General Formula (A): n n n n n n n n n n (wherein R 4 represents a hydrogen atom, an alkyl group optionally having substituent(s) or the like, R 5 represents a hydrogen atom, a halogen atom or the like, and R 6 , R 7 , R 8 and R 9 may be the same or different and each represents a hydrogen atom, a halogen atom, an alkyl group optionally having substituent(s) or the like)] and the like. |