Heterocyclic compound and organic light emitting device comprising same

A heterocyclic compound represented by the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• A is a substituted or unsubstituted aryl ring;
• or a substituted or unsubstituted heteroring;
• X1 is O;
• or S;
• R1 to R4 are the same as or different from each other, and each independently selected from the group consisting of hydrogen;
• deuterium;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted aryl group;
• a substituted or unsubstituted heteroaryl group;
• —SiRR′R″;
• —P(═O)RR′;
• and an amine group unsubstituted or substituted with a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, or two or more groups adjacent to each other bond to each other to form a substituted or unsubstituted aromatic hydrocarbon ring or a substituted or unsubstituted heteroring;
• L is a direct bond;
• a substituted or unsubstituted arylene group;
• or a substituted or unsubstituted heteroarylene group;
• Z is selected from the group consisting of deuterium;
• —CN;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted aryl group;
• a substituted or unsubstituted heteroaryl group;
• —SiRR′R″;
• —P(═O)RR′;
• and an amine group unsubstituted or substituted with a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• R, R′ and R″ are the same as or different from each other, and each independently hydrogen;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted aryl group;
• or
• a substituted or unsubstituted heteroaryl group;
• m is an integer of 0 to 5;
• and
• n is an integer of 1 to 6.