Organic light emitting device

1. An organic light emitting device comprising:

an anode;

a cathode;

a light emitting layer disposed between the anode and the cathode; and

an electron transport region between the cathode and the light emitting layer,

wherein the light emitting layer includes a compound represented by Chemical Formula 1, and

the electron transport region includes a compound represented by Chemical Formula 2:

in Chemical Formula 1,

X is O or S,

L is a bond; or a substituted or unsubstituted C 6-60 arylene,

Ar is a substituted or unsubstituted C 6-60 aryl,

R and R′ are each independently hydrogen; deuterium; a halogen; a cyano; a nitro; an amino: a substituted or unsubstituted C 1-60 alkyl; a substituted or unsubstituted C 3-60 cycloalkyl; a substituted or unsubstituted C 2-60 alkenyl group; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O, and S,

n1 is an integer of 0 to 3, and

n2 is an integer of 0 to 4,

in Chemical Formula 2,

R 1 and R 2 are each independently a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing at least one heteroatom selected from the group consisting of N, O, and S,

L 1 , L 2 , L 3 , and L 4 are each independently a bond; or a substituted or unsubstituted C 6-60 arylene,

A is a substituted or unsubstituted naphthylene,

B is phenyl substituted with a cyano group, dimethylfluorenyl substituted with a cyano group, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, isoindolyl, indazolyl, quinolinyl, isoquiriolinyl, benzoquinolinyl, quinoxalinyl, quinazolinyl, phthalazinyl or triazinyl substituted with phenyl, and

i, j, k, and l are each independently 0 or 1.

2. The organic light emitting device of claim 1 , wherein L is a bond, phenylene, biphenylene, or naphthylene.

3. The organic light emitting device of claim 1 , wherein Ar is phenyl, biphenylyl, terphenylyl, naphthyl, or phenanthrenyl.

4. The organic light emitting device of claim 1 , wherein R and R′ are each independently hydrogen, deuterium, phenyl, biphenylyl, or naphthyl.

5. The organic light emitting device of claim 1 , wherein the compound represented by Chemical Formula 1 is any one selected from the group consisting of:

6. The organic light emitting device of claim 1 , wherein R 1 and R 2 are phenyl.

7. The organic light emitting device of claim 1 , wherein L 1 , L 2 , L 3 , and L 4 are each independently a bond or phenylene.

8. The organic light emitting device of claim 1 , wherein i and j are 0, and k and l are each independently 0 or 1.

9. The organic light emitting device of claim 1 , wherein i+j is 0, and k+l is 1 or 2.

10. The organic light emitting device of claim 1 , wherein A is any one selected from the group consisting of:

11. The organic light emitting device of claim 1 , wherein B is any one selected from the group consisting of:

12. The organic light emitting device of claim 1 , wherein the compound represented by Chemical Formula 2 is any one selected from the group consisting of:

13. The organic light emitting device of claim 1 , wherein the electron transport region includes an electron transport layer, and the electron transport layer includes the compound represented by Chemical Formula 2.

14. The organic light emitting device of claim 1 , wherein the electron transport region includes an electron transport layer and a hole blocking layer, and the hole blocking layer includes a compound represented by Chemical Formula 2.

15. The organic light emitting device of claim 14 , wherein the light emitting layer and the hole blocking layer are positioned adjacent to each other.