Heterocyclic compound and organic light emitting device comprising the same

1. A compound of the following Chemical Formula 1-1:

Chemical Formula 1-1

wherein, in Chemical Formula 1-1,

each X is independently N or CH, with the proviso that at least two of X are N,

Y 1 , Y 2 and Y 3 are each independently O or S, and

Ar 1 and Ar 2 are each independently substituted or unsubstituted C 6-60 aryl.

2. The compound according to claim 1 , wherein each X is N.

3. The compound according to claim 1 , wherein Ar 1 and Ar 2 are phenyl.

4. The compound according to claim 1 , wherein the compound of Chemical Formula 1-1 is one selected from the group consisting of the following compounds:

5. An organic light emitting device comprising:

a first electrode;

a second electrode that is disposed opposite to the first electrode; and

one or more organic material layers that are disposed between the first electrode and the second electrode, wherein one or more one layers of the organic material layers comprise the compound according to claim 1 .

6. The organic light emitting device according to claim 5 , wherein organic material layer may include a light emitting layer, wherein the light emitting layer includes two or more host materials.

7. The organic light emitting device according to claim 6 , wherein the two or more host materials include a compound of Chemical Formula 1-1.