Composition for organic material layer of organic light emitting device and organic light emitting device comprising same

A composition for an organic material layer of an organic light emitting device, the composition comprising a heterocyclic compound represented by the following Chemical Formula A and a heterocyclic compound represented by the following Chemical Formula B:

• wherein, in Chemical Formulae A and B,
• L1 to L4 are the same as or different from each other, and are each independently a direct bond;
• a substituted or unsubstituted C6 to C60 arylene group;
• or a substituted or unsubstituted C2 to C60 heteroarylene group,
• Ar1, Ar2, and Ar4 are the same as or different from each other, and are each independently a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group,
• R1 to R4 are the same as or different from each other, and 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,
• R5 is 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 two or more adjacent R5's are bonded to each other to form a ring,
• l1 to l4 are the same as or different from each other, and are each independently an integer from 1 to 3, and when each of l1 to l4 is an integer of 2 or higher, substituents in the parenthesis are the same as or different from each other,
• r1 and r4 are the same as or different from each other, and are each independently an integer from 0 to 3,
• r2 is an integer from 0 to 2,
• r3 and r5 are the same as or different from each other, and are each independently an integer from 0 to 4,
• when each of r1 to r5 is an integer of 2 or higher, substituents in the parenthesis are the same as or different from each other,
• ar1 and ar2 are the same as or different from each other, and are each independently an integer from 1 to 4, and when each of ar1 and ar2 is an integer of 2 or higher, substituents in the parenthesis are the same as or different from each other,
• Ar3 is represented by the following Chemical Formula K,
• in Chemical Formula K,
• means a moiety linked to L2,
• Xk is O;
• S;
• CRk1Rk2;
• or NRk3,
• Rk and Rk1 to Rk3 are the same as or different from each other, and are each independently hydrogen;
• deuterium;
• a substituted or unsubstituted C1 to C60 alkyl group;
• a substituted or unsubstituted C6 to C60 aryl group;
• or a substituted or unsubstituted C2 to C60 heteroaryl group,
• rk is an integer from 0 to 7,
• N-Het1 is represented by the following Structural Formula N,
• [Structural Formula N]
• in Structural Formula N,
• means a moiety linked to L3, and
• Ra and Rb are the same as or different from each other, and are each independently a substituted or unsubstituted C6 to C60 aryl group;
• a substituted or unsubstituted C2 to C60 heteroaryl group;
• or a combination thereof,