Patent ID: 8426038

Claim:
A phosphorescent polymer compound comprising a structural unit that is obtained by radical polymerization of a compound of Formula (1): wherein L 1 is a ligand selected from Formulae (a2) to (a5) below and L 2 is a ligand selected from Formulae (b1) to (b3) below: wherein a plurality of R a in each of Formulae (a2) to (a5) are each independently a hydrogen atom, a C1-10 alkyl group or a C1-5 alkyl or alkenyl group having a polymerizable functional group; and only one of the plurality of R a in each of Formulae (a2) to (a5) is a C1-5 alkyl or alkenyl group having a polymerizable functional group; wherein a plurality of R b in each of Formulae (b1) to (b3) are each independently a hydrogen atom or a C1-10 alkyl group; and wherein L 1 and L 2 are selected such that E 1 and E 2 described below satisfy the relation E 1 <E 2 ; E 1 is a frequency (cm −1 ) of light showing a maximum luminescence intensity in a luminescence spectrum obtained by exciting a solution of an iridium complex of Formula (2) below [in dichloromethane at 25° C., the solution being prepared such that the absorbance for 350 nm monochromatic light with a light path length of 1 cm is 0.1] with 350 nm monochromic light: wherein L 1 is a ligand selected from Formulae (a2) to (a5) as L 1 is defined in Formula (1), in which R a are all hydrogen atoms; E 2 is a frequency (cm −1 ) of light showing a maximum luminescence intensity in a luminescence spectrum obtained by exciting a solution of an iridium complex of Formula (3) below [in dichloromethane at 25° C., the solution being prepared such that the absorbance for 350 nm monochromatic light with a light path length of 1 cm is 0.1] with 350 nm monochromic light: wherein L 2 is a ligand selected from Formulae (b1) to (b3) as L 2 is defined in Formula (1), in which R b are all hydrogen atoms.