Organometallic compound, organic light emitting diode and organic light emitting device including the same

An organometallic compound represented by Formula 1:

• wherein each of a1 and a2 is independently an integer of 0 to 2, and n is an integer of 1 to 3,
• wherein each of X1, X2 and X3 is independently selected from the group consisting of C(R3)2, Si(R3)2, CR3, SiR3, NR3, PR3, N, P, O, S and Se, each of R3 in C(R3)2 and Si(R3)2 is the same as or different from each other,
• wherein each of Y1, Y2, Y3 and Y4 is independently selected from the group consisting of CR5 and N,
• wherein each of Z1 and Z2 is independently selected from the group consisting of N, CR6 and O,
• wherein each of R1 and R2 is independently selected from the group consisting of deuterium, halogen, a hydroxy group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylamino group, a substituted or unsubstituted C1 to C20 alkylsilyl group, a substituted or unsubstituted C4 to C30 alicyclic group, a substituted or unsubstituted C3 to C30 hetero-alicyclic group, a substituted or unsubstituted C6 to C30 aromatic group and a substituted or unsubstituted C3 to C30 heteroaromatic group, or adjacent two of R1 and R2 are combined to form a substituted or unsubstituted C4 to C20 alicyclic ring, a substituted or unsubstituted C3 to C20 hetero-alicyclic ring, a substituted or unsubstituted C6 to C20 aromatic ring or a substituted or unsubstituted C3 to C20 heteroaromatic ring, and
• wherein each of R3, R5 and R6 is independently selected from the group consisting of hydrogen, deuterium, halogen, a hydroxy group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C1 to C20 alkylamino group, a substituted or unsubstituted C1 to C20 alkylsilyl group, a substituted or unsubstituted C4 to C30 alicyclic group, a substituted or unsubstituted C3 to C30 hetero-alicyclic group, a substituted or unsubstituted C6 to C30 aromatic group and a substituted or unsubstituted C3 to C30 heteroaromatic group.