Heterocyclic compound and organic light emitting device comprising same

A heterocyclic compound of Chemical Formula 1:

• wherein in Chemical Formula 1:
• a is the following Chemical Formula a-1, and b is a benzene ring or a naphthalene ring;
• any two of G1 to G3 are a group of the following Chemical Formula A and the two Chemical Formula A are the same as each other, and the remaining group of G1 to G3 that is not the following Chemical Formula A, and G101, are the same as or different from each other, and each independently is hydrogen, deuterium, a halogen group, a cyano group, a nitro group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• g101 is an integer of 1 to 3;
• and
• when g101 is 2 or greater, the two or more G101s are the same as or different from each other,
• wherein in Chemical Formula A:
• L1 and L2 are the same as or different from each other, and each independently is a direct bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group;
• Ar1 and Ar2 are the same as or different from each other, and each independently is hydrogen, deuterium, a halogen group, a cyano group, a nitro group, a substituted or unsubstituted silyl group, a substituted or unsubstituted boron group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted fused ring group of aromatic hydrocarbon ring and aliphatic hydrocarbon ring, or a substituted or unsubstituted heteroaryl group, or bond to each other to form a substituted or unsubstituted heteroring;
• and
• means a site bonding to Chemical Formula 1;
• wherein Chemical Formula a-1:
• X1 is O, S or CRR′;
• m is 0 or 1;
• R and R′ are the same as or different from each other, and each independently a substituted or unsubstituted alkyl group;
• or a substituted or unsubstituted aryl group, or bond to each other to form a substituted or unsubstituted ring;
• and
• is a site bonding to Chemical Formula 1.