Patent ID: 6872474

Claim:
A light emitting polymer composition comprising a polymer component and a phosphorescent agent contained in the polymer component, wherein the polymer component is a copolymer composed of 50 to 99 mol % of structural units derived from the hole transporting monomer and 50 to 1 mol % of structural units derived from the electron transporting monomer, in which the electron transporting monomer is an oxadiazole derivative selected from the group consisting of 2-β-naphthyl-5-(4-vinylphenyl)-1,3,4-oxadiazole, 2-α-naphthyl-5-(4-vinylphenyl)-1,3,4-oxadiazole, 2-phenyl-5-(4-vinylphenyl)-1,3,4-oxadiazole, 2-phenyl-5-(4-vinyl-p-biphenyl)-1,3,4-oxadiazole, 2-(p-biphenyl)-5-(4-vinylphenyl)-1,3,4-oxadiazole, 2-(p-biphenyl)-5-(4-propenylphenyl)-1,3,4-oxadiazole, 2-t-butoxyphenyl-5-(4-(4-vinylphenyl)-p-biphenyl)-1,3,4-oxadiazole, and substituted products of these oxadiazole derivatives with an acryloyl or methacryloyl group.