Heterocyclic compound and organic light-emitting device comprising same

A heterocyclic compound of the following Chemical Formula 1:

• in Chemical Formula 1,
• X1 to X3 are each independently N or CH,
• at least one of X1 to X3 is N, and
• N-Het is represented by the following Chemical Formula N-1 or N-2,
• in Chemical Formulae N-1 and N-2,
• R1 to R3 are each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted silyl group;
• a substituted or unsubstituted phosphine oxide group;
• a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C3 to C60 cycloalkyl group;
• a substituted or unsubstituted bicyclic or lower aryl group;
• a substituted or unsubstituted terphenyl group;
• a substituted or unsubstituted fluorenyl group;
• a substituted or unsubstituted tetracyclic or higher aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group,
• Ar is a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group, and
• Het1 is represented by the following Chemical Formula H-1, and Het2 is represented by the following Chemical Formula H-2,
• in Chemical Formulae H-1 and H-2,
• Y1 and Y2 are each independently O or S,
• A1 to A4 and B1 to B4 each independently bond to Chemical Formula 1, or are hydrogen;
• or deuterium, and
• Chemical Formula 1 bonds to any one of A1 to A4 of Chemical Formula H-1 and any one of B1 to B4 of Chemical Formula H-2, which is represented by Am-Bn, m and n are each 1, 2, 3 or 4, and m and n are different.