Patent ID: 6955856

Claim:
A biphenyl derivative represented by formula 1: wherein: R 1 and R 2 are independently a hydrogen; a C 1-20 linear or branched alkyl group; a C 5-20 cycloalkyl group; a C 6-20 aryl group; and a C 6-20 aryl group having at least one substituent selected from the group consisting of a halogen atom, a C 1-10 halogenated alkyl group, —Si(R)(R′)(R″), a C 1-10 alkyl group, a C 1-10 alkoxy group, a C 6-10 aryl group, a C 4-10 heteroaryl group, and —N(R)(R′); Ar 1 , Ar 2 , Ar 3 and Ar 4 are independently a hydrogen; a C 1-20 linear or branched alkyl group; a C 5-20 cycloalkyl group; a C 6-20 aryl group; and a C 6-20 aryl group having at least one substituent selected from the group consisting of a halogen atom, a C 1-10 halogenated alkyl group, —Si(R)(R′)(R″), a C 1-10 alkyl group, a C- 1-10 alkoxy group, a C 6-10 aryl group, a C 4-10 heteroaryl group and —N(R)(R′) or at least one selected from the group consisting of Ar 1 and Ar 2 , and Ar 3 and Ar 4 are joined together to form a fused ring structure with the N to which they are attached; and R, R′ and R″ are independently selected from the group consisting of a hydrogen atom, a C 1-10 alkyl group, a C 1-10 alkoxy group, a C 6-10 aryl group and a C 4-10 heteroaryl group.