Novel heterocyclic compound and organic light emitting device comprising the same

A compound of the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• each X is independently N or CH, with the proviso that at least two of X are N,
• Y1 is N, O or S,
• Y2 and Y3 are each independently O or S,
• Ar1 and Ar2 are each independently substituted or unsubstituted C6-60 aryl;
• or substituted or unsubstituted C2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O, S and Si,
• R1 to R6 are each independently halogen;
• hydroxy;
• cyano;
• nitrile;
• nitro;
• amino;
• substituted or unsubstituted C1-60 alkyl;
• substituted or unsubstituted C1-60 haloalkyl;
• substituted or unsubstituted C1-60 thioalkyl;
• substituted or unsubstituted C1-60 alkoxy;
• substituted or unsubstituted C1-60 haloalkoxy;
• substituted or unsubstituted C3-60 cycloalkyl;
• substituted or unsubstituted C2-60 alkenyl;
• substituted or unsubstituted C6-60 aryl;
• substituted or unsubstituted C6-60 aryloxy;
• or substituted or unsubstituted C2-60 heteroaryl containing at least one of O, N, Si and S,
• a, b, c, d and e are each independently an integer of 0 to 3, and
• f is an integer of 0 to 4.