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

A heterocyclic compound represented by Formula 1:

• wherein, in Formula 1,
• X1, X2, X3, and X4 are each independently C or N, and at least one of three X1(s), four X2(s), three X3(s), four X4(s), or any combination thereof is N,
• Y1 and Y2 are each independently C or N, and at least one of Y1 and Y2 is N,
• R1, R2, R3, and R4 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted aryl group having 6 to 14 ring-forming atoms, a substituted or unsubstituted heteroaryl group having 5 to 14 ring-forming atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted arylamino group having 6 to 14 ring-forming atoms, a substituted or unsubstituted heteroarylamino group having 5 to 14 ring-forming atoms, or a substituted or unsubstituted arylboranyl group having 6 to 14 ring-forming atoms,
• R5 is a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted aryl group having 6 to 14 ring-forming atoms, a substituted or unsubstituted heteroaryl group having 5 to 14 ring-forming atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted arylamino group having 6 to 14 ring-forming atoms, a substituted or unsubstituted heteroarylamino group having 5 to 14 ring-forming atoms, a substituted or unsubstituted indolo[3,2,1-jk]carbazolyl group, or —R51—R52,
• R51 is a substituted or unsubstituted arylene group having 6 to 14 ring-forming atoms or a substituted or unsubstituted heteroarylene group having 5 to 14 ring-forming atoms,
• R52 is a substituted or unsubstituted amino group, a substituted or unsubstituted arylamino group having 6 to 14 ring-forming atoms, a substituted or unsubstituted hetero arylamino group having 5 to 14 ring-forming atoms, or a substituted or unsubstituted heteroaryl group having 5 to 14 ring-forming atoms,
• n1 and n2 are each independently 1, 2, 3, or 4,
• m1 and m2 are each independently 1, 2, or 3, and
• m3 is 0, 1, or 2.