Organometallic complex and organic light-emitting device including the same

An organometallic complex represented by Formula 1-1 or Formula 1-2:

• wherein, in Formulae 1-1 and 1-2,
• a ring A is a condensed ring comprising X2,
• a ring B and a ring C are each independently a substituted or unsubstituted C6-C40 aromatic ring, a substituted or unsubstituted C2-C40 hetero aromatic ring, or a substituted or unsubstituted C3-C10 cycloalkene group,
• X1 is carbon (C), nitrogen (N), or phosphorus (P), and X2 is C, N, P, oxygen (O) or sulfur (S),
• Y1 to Y4 are each independently a direct bond, O, S, a substituted or unsubstituted C1-C10 alkylene group, a substituted or unsubstituted C6-C40 arylene group, or a substituted or unsubstituted C1-C40 heteroarylene group,
• R1 to R6 are each independently selected from a deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C40 aryl group, a substituted or unsubstituted C1-C40 heteroaryl group, a substituted or unsubstituted C6-C40 aryloxy group, a substituted or unsubstituted C6-C40 arylthio group, —N(Q1)(Q2), —C(═O)(Q3), and —Si(Q4)(Q5)(Q6) (wherein Q1 to Q are each independently a hydrogen, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C6-C40 aryl group, or a substituted or unsubstituted C1-C40 heteroaryl group), wherein optionally R2 and R3 are each independently (═O),
• R is a substituted or unsubstituted C6-C40 aryl group or a substituted or unsubstituted C2-C40 heteroaryl group,
• a is an integer of 1 to 7, and when a is 2 or more, a plurality of R1s are independent of each other,
• b is an integer of 1 to 7, and when b is 2 or more, a plurality of R4s are independent of each other,
• c is an integer of 1 to 4, and when c is 2 or more, a plurality of R5s are independent of each other,
• d is an integer of 1 to 4, and when d is 2 or more, a plurality of R6s are independent of each other, and
• e is 0 or 1.