Heterocyclic compound, organic light emitting device comprising same and composition for organic material layer of organic light emitting device

A heterocyclic compound of the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• L1 is a direct bond;
• a substituted or unsubstituted C6 to C60 arylene group;
• or a substituted or unsubstituted C2 to C60 heteroarylene group,
• 1 is an integer from 1 to 3, and when 1 is 2 or greater, L1 is the same or different,
• Y is O;
• S;
• C(R10)(R11) or N(R12),
• H1 is hydrogen;
• or deuterium,
• h is an integer from 1 to 4, and when h is 2 or greater, H1 is the same or different,
• R1 to R12 are each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C3 to C60 cycloalkyl group;
• a substituted or unsubstituted C2 to C60 heterocycloalkyl group;
• a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group,
• at least one of R1 to R9 is deuterium,
• r is 1 or 2, and when r is 2, R5 is the same or different,
• Ar1 is a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C3 to C60 cycloalkyl group;
• a substituted or unsubstituted C2 to C60 heterocycloalkyl group;
• a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group,
• Ar2 is a group represented by the following Chemical Formula A or B,
• in Chemical Formulae A and B,
• is a moiety bonded to Chemical Formula 1,
• Z is O;
• S;
• or C(R27)(R28),
• R21 to R28 are each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C3 to C60 cycloalkyl group;
• a substituted or unsubstituted C2 to C60 heterocycloalkyl group;
• a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group, or bonded to an adjacent group to form a substituted or unsubstituted aromatic hydrocarbon ring;
• or a substituted or unsubstituted aromatic hetero ring, and
• a, b, c, e, and f are each an integer from 0 to 4, d is an integer from 0 to 3, and when a to f are each 2 or greater, substituents in the parenthesis are the same or different.