An iridium complex is represented by below formula:
wherein X’ and X” independently represent carbon or nitrogen; X1, X2, X3 and X4 independently represent carbon or nitrogen; R1 and R5 independently represent substituted or unsubstituted C1-C12 alkyl; R2, R3 and R4 independently represent hydrogen, C1-C12 alkyl, substituted or unsubstituted C6-C12 aryl or -CmF2m+1, m is from 1 to 3;l, each of m and n is from 1 to 3; A1 and A2 independently represent an unsaturated 5-member or 6-member ring; B is -O-, -NR- or -CR2-, A2 may join with -NR- or -CR2- to form a C9-C14 N-heteroaromatic or aromatic ring; b is 0 or 1; R6 is hydrogen, fluorine, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C1-C6 alkoxyl or substituted or unsubstituted C6-C12 aryl, substituted or unsubstituted C1-C6 amino group or -CxF2x+1, x is from 1 to 3;and p is from 1 to 3. |