Heterocyclic compound and organic light emitting device comprising the same

A compound of Chemical Formula 1:

• wherein:
• X1 is O or S;
• L1 is a single bond or a substituted or unsubstituted phenylene;
• L2 is a single bond or substituted or unsubstituted phenylene;
• Y1 to Y3 are each independently N or CR3, provided that at least one of Y1 to Y3 is N;
• Ar1a and Ar1b are each independently any one selected from the group consisting of:
• wherein Z1 to Z3 are each independently hydrogen, deuterium, halogen, cyano, nitro, amino, a substituted or unsubstituted C1-20 alkyl, a substituted or unsubstituted C1-20 haloalkyl, a substituted or unsubstituted C6-20 aryl;
• Ar2 is:
• Z11 to Z13 are each hydrogen;
• c14 is an integer of 4,
• c15 is an integer of 3,
• each R1 is independently hydrogen, deuterium, halogen, cyano, nitro, amino, a substituted or unsubstituted C1-60 alkyl, a substituted or unsubstituted C1-60 haloalkyl, a substituted or unsubstituted C1-60 alkoxy, a substituted or unsubstituted C1-60 haloalkoxy, a substituted or unsubstituted C3-60 cycloalkyl, a substituted or unsubstituted C2-60 alkenyl, a substituted or unsubstituted C6-60 aryl, a substituted or unsubstituted C6-60 aryloxy, or a substituted or unsubstituted C1-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and Si;
• each R2 independently is hydrogen, deuterium, cyano, or a substituted or unsubstituted C1-10 alkyl;
• each R3 is independently hydrogen, deuterium, halogen, cyano, nitro, amino, a substituted or unsubstituted C1-60 alkyl, a substituted or unsubstituted C1-60 haloalkyl, a substituted or unsubstituted C1-60 alkoxy, a substituted or unsubstituted C1-60 haloalkoxy, a substituted or unsubstituted C3-60 cycloalkyl, a substituted or unsubstituted C2-60 alkenyl, a substituted or unsubstituted C6-60 aryl;
• a substituted or unsubstituted C6-60 aryloxy, or a substituted or unsubstituted C1-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S;
• and
• n1 and n2 are each independently an integer of 0 to 3.