FLUORINATED OPTICAL MATERIAL COMPRISING FLUOROPOLYMER HAVING FUNCTIONAL GROUP CAPABLE OF FORMING COMPLEX WITH RARE EARTH METAL ION

摘要

An optical material being an organic composition suitable as an optical material for, for example, photocommunications and comprising a fluoropolymer having a functional group capable of forming a complex with rare earth metal ions and rare earth metal ions. The fluoropolymer having a functional group capable of forming a complex with rare earth metal ions has at least two heteroatoms in structural units of side chains, and with respect to the fluoropolymer the maximum value of absorption coefficient in the 1290-1320 nm, 1530-1570 nm and 600-900 nm wavelength band regions is not greater than 1 cm<-1>. The rare earth metal ion is at least one member selected from the group consisting of erbium (Er) ion, thulium (Tm) ion, praseodymium (Pr) ion, holmium (Ho) ion, neodymium (Nd) ion, europium (Eu) ion, dysprosium (Dy) ion, samarium (Sm) ion, cerium (Ce) ion and terbium (Tb) ion.