| abstract |
An infrared-absorbing composition comprising a phosphoric acid ester compound including a phosphoric acid monoester represented by formula (1) below and a phosphoric acid diester represented by formula (2) below, and copper ion, wherein the ratio of the phosphoric acid monoester and the phosphoric acid diester is 30:70 to 74:26 as the molar ratio.n n nwherein R 1 and R 2 each independently represent an ester bond-containing C4-18 group, a C4-18 alkyl group, a C4-18 alkenyl group or a C4-18 alkynyl group, with the proviso that the multiple R 2 groups may be the same or different. |