Organometallic compound, organic light-emitting device including the same, and electronic apparatus including the organic light-emitting device

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

• wherein, in Formulae 1-1 and 1-2,
• M is Pt or Pd,
• each of X1, X2, and X3 is carbon,
• X4 is nitrogen,
• X11 is N, C(R11), or C(R0);
• X12 is N, C(R12), or C(R0);
• X13 is N, C(R13), or C(R0);
• and X14 is N, C(R14), or C(R0),
• X21 is N, C(R21), or C(R0);
• X22 is N, C(R22), or C(R0);
• and X23 is N, C(R23), or C(R0),
• X31 is N, C(R31), or C(R0);
• X32 is N, C(R32), or C(R0);
• X33 is N, C(R33), or C(R0);
• X34 is N, C(R34), or C(R0);
• X35 is N, C(R35), or C(R0);
• and X36 is N, C(R36), or C(R0),
• X41 is N, C(R41), or C(R0);
• X42 is N, C(R42), or C(R0);
• X43 is N, C(R43), or C(R0);
• and X44 is N, C(R44), or C(R0),
• T8 is O, S, N(R81), C(R81)(R82), or Si(R81)(R82),
• each R0 is independently a group represented by Formula 2,
• R11 to R14, R21 to R23, R31 to R36, R41 to R44, R51 to R55, R61 to R65, R71 to R73, R81, and R82 are each independently:
• a group represented by Formula 2;
• hydrogen or deuterium;
• or
• a C1-C20 alkyl group, a phenyl group, or a carbazolyl group, each unsubstituted or substituted with at least one of deuterium, a C1-C20 alkyl group, a phenyl group, a carbazolyl group, or a combination thereof,
• wherein Condition A or Condition B is satisfied:
• Condition A
• each of X21 to X23 in Formulae 1-1 and 1-2 is not N, and A-i), A-ii) or A-iii) is true:
• A-i) at least one of X11 to X14 in Formula 1-1 or at least one of X11 and X12 in Formula 1-2, at least one of X31 to X36 in Formulae 1-1 and 1-2, at least one of X41 to X44 in Formulae 1-1 and 1-2, or a combination thereof, is C(R0),
• A-ii) at least one of R51 to R55 in Formulae 1-1 and 1-2, at least one of R61 to R65 in Formulae 1-1 and 1-2, at least one of R71 to R73 in Formulae 1-1 and 1-2, at least one of R81 and R82 in Formulae 1-1 and 1-2, or a combination thereof, is a group represented by Formula 2, or
• A-iii) at least one of X11 to X14 in Formula 1-1 or at least one of X11 and X12 in Formula 1-2, at least one of X31 to X36 in Formulae 1-1 and 1-2, at least one of X41 to X44 in Formulae 1-1 and 1-2, or a combination thereof, is C(R0), and at least one of R51 to R55 in Formulae 1-1 and 1-2, at least one of R61 to R65 in Formulae 1-1 and 1-2, at least one of R71 to R73 in Formulae 1-1 and 1-2, at least one of R81 and R82 in Formulae 1-1 and 1-2, or a combination thereof, is a group represented by Formula 2,
• Condition B
• at least one of X21 to X23 in Formulae 1-1 and 1-2 is N, and B-i), B-ii) or B-iii) is true:
• B-i) at least one of X11 to X14 in Formula 1-1 or at least one of X11 and X12 in Formula 1-2, at least one of X21 to X23 in Formulae 1-1 and 1-2, at least one of X31 to X36 in Formulae 1-1 and 1-2, at least one of X41 to X44 in Formulae 1-1 and 1-2, or a combination thereof, is C(R0),
• B-ii) at least one of R51 to R55 in Formulae 1-1 and 1-2, at least one of R61 to R65 in Formulae 1-1 and 1-2, at least one of R71 to R73 in Formulae 1-1 and 1-2, at least one of R81 and R82 in Formulae 1-1 and 1-2, or a combination thereof, is a group represented by Formula 2, or
• B-iii) at least one of X11 to X14 in Formula 1-1 or at least one of X11 and X12 in Formula 1-2, at least one of X21 to X23 in Formulae 1-1 and 1-2, at least one of X31 to X36 in Formulae 1-1 and 1-2, at least one of X41 to X44 in Formulae 1-1 and 1-2, or a combination thereof, is C(R0), and at least one of R51 to R55 in Formulae 1-1 and 1-2, at least one of R61 to R65 in Formulae 1-1 and 1-2, at least one of R71 to R73 in Formulae 1-1 and 1-2, at least one of R81 and R82 in Formulae 1-1 and 1-2, or a combination thereof, is a group represented by Formula 2, and
• when the organometallic compound represented by Formulae 1-1 or 1-2 comprises at least two groups represented by Formula 2, the at least two groups represented by Formula 2 are identical to or different from each other,
• wherein, in Formula 2,
• Z1 is:
• hydrogen or deuterium;
• or
• a C1-C20 alkyl group, a phenyl group, or a carbazolyl group, each unsubstituted or substituted with at least one of deuterium, a C1-C20 alkyl group, a phenyl group, a carbazolyl group, or a combination thereof,
• Z2 is hydrogen or deuterium,
• Z3 is a C1-C20 alkyl group, a phenyl group, or a carbazolyl group, each unsubstituted or substituted with at least one of deuterium, a C1-C20 alkyl group, a phenyl group, a carbazolyl group, or a combination thereof,
• at least two of Z1 to Z3 are not linked to each other to form a ring, and
• * indicates a binding site to a neighboring atom.