NEAR-INFRARED RAY CUTOFF FUNCTION OF OPTI CAL FILTER MADE OF SYNTHETIC RESIN CONTAINING CU(II) COMPLEX FORMED WITH PHOSPHORIC-ACID ESTER

The structure and optical characteristics of Cu(II) ion complex formed with bis(2-methacryloyloxyethyl) phosphate (PMOE) were investigated i n a MMA monomer solution and in its polymerized resin. The complex sho wed a broad absorption peak at around 840 nm in the monomer solution, which results from a Jahn-Teller effect. The complex probably formed a monomeric structure of Cu(II) complex by the coordination of PMOE mol ecules. The transparent resin polymerized from the monomer solution sh owed the same optical feature as that of the monomer. It exhibited hig h transmittance in the range from 350 nn to 700 nm, while it efficient ly cut off light in the near infrared range from 700 nm to 1200 nm. Cu (II) ion is considered to form mononuclear complexes with PMOE in the resin, as well as in monomer solution. The resin having such optical f eatures will actually be helpful for the adjustment of luminous effici ency for CCD and camera.