Organic light emitting device and display device including the same

1. An organic light emitting device, comprising:

a first electrode;

a hole transport region on the first electrode;

an emission layer on the hole transport region;

an electron transport region on the emission layer; and

a second electrode on the electron transport region,

wherein the hole transport region includes a compound represented by the following Formula 1:

wherein, in Formula 1, X, Y, and Z are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aromatic group having 5 to 30 carbon atoms, and a substituted or unsubstituted heteroaromatic group having 5 to 30 carbon atoms,

wherein the electron transport region includes a compound represented by one of the following Formulae 5a to 5d:

and

wherein, in Formulae 5a to 5d, Ar 1 , Ar 2 , Ar 3 , and Ar 4 are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aromatic group having 5 to 30 carbon atoms, and a substituted or unsubstituted heteroaromatic group having 5 to 30 carbon atoms, and o, p, q, and r are each independently an integer of 1 to 3.

2. The organic light emitting device as claimed in claim 1 , wherein X, Y, and Z are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aryl group having 5 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 30 carbon atoms, a substituted or unsubstituted arylamino group having 5 to 30 carbon atoms, a substituted or unsubstituted diarylamino group having 5 to 30 carbon atoms, and a substituted or unsubstituted arylakyl group having 5 to 30 carbon atoms.

3. The organic light emitting device as claimed in claim 1 , wherein X, Y, and Z are each independently selected from a phenyl group, a naphthyl group, a biphenyl group, a terphenyl group, an anthracene group, a fluorenyl group, and a carbazolyl group.

4. The organic light emitting device as claimed in claim 1 , wherein the compound represented by Formula 1 of the hole transport region includes at least one of the following compounds:

5. The organic light emitting device as claimed in claim 1 , wherein the emission layer includes a compound represented by the following Formula 3:

wherein, in Formula 3, Ar 11 and Ar 12 are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aromatic group having 5 to 30 carbon atoms, and a substituted or unsubstituted heteroaromatic group having 5 to 30 carbon atoms, and

m and n are each independently an integer of 0 to 3.

6. The organic light emitting device as claimed in claim 5 , wherein:

Ar 11 is a substituted or unsubstituted arylene group having 7 to 30 carbon atoms or a substituted or unsubstituted heteroarylene group having 7 to 30 carbon atoms,

when m is 0, Ar 11 is a single bond,

Ar 12 is a substituted or unsubstituted aryl group having 5 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 30 carbon atoms, and

when m or n is an integer greater than or equal to 2, Ar 11 is the same or different, Ar 12 is the same or different, and Ar 11 and Ar 12 are the same or different from each other.

7. The organic light emitting device as claimed in claim 5 , wherein Ar 11 is a substituted or unsubstituted phenyl group or a substituted or unsubstituted naphthyl group.

8. The organic light emitting device as claimed in claim 5 , wherein the compound represented by Formula 3 of the emission layer includes one of the following compounds:

9. The organic light emitting device as claimed in claim 1 , wherein, in Formulae 5a to 5d:

Ar 1 Ar 2 , Ar 3 and Ar 4 are each independently a substituted or unsubstituted aryl group having 5 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 30 carbon atoms, and

when o, p, q, or r are greater than or equal to 2, each Ar 1 is the same or different, each Ar 2 is the same or different, each Ar 3 is the same or different, or each Ar 4 is the same or different.

10. The organic light emitting device as claimed in claim 1 , wherein the compound represented by one of Formulae 5a to 5d of the electron transport region includes one of the following compounds:

11. A display device, comprising a plurality of pixels, wherein one of the pixels includes:

a first electrode;

a hole transport region on the first electrode;

an emission layer on the hole transport region;

an electron transport region on the emission layer; and

a second electrode on the electron transport region,

wherein the hole transport region includes a compound represented by the following Formula 1:

wherein, in Formula 1, X, Y, and Z are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aromatic group having 5 to 30 carbon atoms, and a substituted or unsubstituted heteroaromatic group having 5 to 30 carbon atoms,

wherein the electron transport region includes a compound represented by one of the following Formulae 5a to 5d:

and

wherein, in Formulae 5a to 5d, Ar 1 , Ar 2 , Ar 3 , and Ar 4 are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aromatic group having 5 to 30 carbon atoms, and a substituted or unsubstituted heteroaromatic group having 5 to 30 carbon atoms, and o, p, q, and r are each independently an integer of 1 to 3.

12. The display device as claimed in claim 11 , wherein the compound represented by Formula 1 of the hole transport region includes at least one of the following compounds:

13. The display device as claimed in claim 11 , wherein the hole transport region includes

a hole injection layer on the first electrode; and

a hole transport layer on the hole injection layer.

14. The display device as claimed in claim 11 , wherein the emission layer includes a compound represented by the following Formula 3:

wherein, in Formula 3, Ar 11 and Ar 12 are each independently selected from hydrogen, deuterium, a substituted or unsubstituted aromatic group having 5 to 30 carbon atoms, and a substituted or unsubstituted heteroaromatic group having 5 to 30 carbon atoms, and

m and n are each independently an integer of 0 to 3.

15. The display device as claimed in claim 14 , wherein the compound represented by Formula 3 of the emission layer includes one of the following compounds:

16. The display device as claimed in claim 11 , wherein the compound represented by one of Formulae 5a to 5d of the electron transport region includes one of the following compounds:

17. The display device as claimed in claim 11 , wherein the electron transport region includes

an electron transport layer on the emission layer; and

an electron injection layer on the electron transport layer.