Heterocyclic compound and organic light-emitting element including same

A hetero-cyclic compound of Chemical Formula 1:

• wherein, in Chemical Formula 1:
• X1 is O or S;
• L1 and L2 are the same as or different from each other, and each independently is a direct bond, a substituted or unsubstituted C6 to C60 arylene group, or a substituted or unsubstituted C2 to C60 heteroarylene group;
• two or more of Y1 to Y3 are N, and the remaining is CR9;
• Ar1a and Ar1b are the same as or different from each other, and each independently is a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group;
• Ar2 is one of the following Chemical Formula 2 or 3:
• wherein:
• Cy1 to Cy4 are the same as or different from each other, and each independently is a substituted or unsubstituted C6 to C60 aromatic hydrocarbon ring or a substituted or unsubstituted C2 to C60 aromatic heteroring;
• X2 is O, S, NR10 or CR11R12;
• R1 to R8 and R10 to R12 are the same as or different from each other, and each independently is hydrogen, deuterium, a halogen group, a cyano group, a nitro group, an amino group, a substituted or unsubstituted C1 to C60 alkyl group, a substituted or unsubstituted C1 to C60 haloalkyl group, a substituted or unsubstituted C1 to C60 alkoxy group, a substituted or unsubstituted C1 to C60 haloalkoxy group, a substituted or unsubstituted C3 to C60 cycloalkyl group, a substituted or unsubstituted C2 to C60 alkenyl group, a substituted or unsubstituted C6 to C60 aryl group, a substituted or unsubstituted C6 to C60 aryloxy group, or a substituted or unsubstituted C2 to C60 heteroaryl group;
• R9 is hydrogen or deuterium;
• * is a site bonding to L2 of Chemical Formula 1;
• c and d are each an integer of 0 to 3;
• e is an integer of 1 or 2;
• f and g are each 1;
• when c is 2 or greater, the R1s are the same as or different from each other;
• when d is 2 or greater, the R2s are the same as or different from each other;
• and
• when e is 2, the Ar2s are the same as or different from each other.