Organic light-emitting device

1. An organic light-emitting device comprising:

a first electrode;

a second electrode facing the first electrode; and

an emission layer disposed between the first electrode and the second electrode; and

an electron transport region between the second electrode and the emission layer,

wherein the electron transport region comprises an electron injection layer comprising a first component comprising at least one halide of an alkali metal (Group I), a second component comprising at least one organometallic compound, and a third component comprising at least one lanthanide metal,

wherein the electron injection layer comprises a first layer and a second layer,

wherein the first layer is a film comprising the second component dispersed within a matrix comprising the first component, and the second layer is a film comprising the third component dispersed within a matrix comprising the first component; or

the first layer is a film comprising the second component dispersed within a matrix comprising the first component, and the second layer is a film comprising the third component dispersed within a matrix comprising the second component; or

the first layer is a film comprising the third component dispersed within a matrix comprising the first component, and the second layer is a film comprising the second component dispersed within a matrix comprising the first component; or

the first layer is a film comprising the third component dispersed within a matrix comprising the first component, and the second layer is a film comprising the third component dispersed within a matrix comprising the second component; or

the first layer is a film comprising the third component dispersed within a matrix comprising the second component, and the second layer is a film comprising the second component dispersed within a matrix comprising the first component; or

the first layer is a film comprising the third component dispersed within a matrix comprising the second component, and the second layer is a film comprising the third component dispersed within a matrix comprising the first component.

2. The organic light-emitting device of claim 1 , wherein the first component comprises one selected from LiF, LiCl, LiBr LiI, NaF, NaCl, NaBr, NaI, KF, KCl, KBr, KI, RbF, RbCl, RbBr, RbI, CsF, CsCl, CsBr, CsI, or any combination thereof.

3. The organic light-emitting device of claim 1 , wherein the first component comprises one selected from LiF, KCl, KI, RbCl, RbI, or any combination thereof.

4. The organic light-emitting device of claim 1 , wherein the second component comprises at least one metal complex,

wherein the at least one metal complex comprises at least one metal selected from lithium (Li), aluminum (Al), titanium (Ti), zirconium (Zr), hafnium (Hf), zinc (Zn), or copper (Cu).

5. The organic light-emitting device of claim 4 , wherein the at least one metal complex comprises at least one organic ligand represented by Formula 1 or 2:

wherein, in Formulae 1 and 2,

Z 1 and Z 2 are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino aroup, a hydrazono group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzoflorenyl group, a phenanthrenyl group, an anthracenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazoly group, —Si(Q 31 )(Q 32 )(Q 33 ), —C(═O)(Q 31 ), —S(═O) 2 (Q 31 ), or —P(═O)(Q 31 )(Q 32 ),

Q 31 to Q 33 are each independently selected from a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, or a carbazolyl group,

e4 is an integer selected from 1 to 4,

e6 is an integer selected from 1 to 6, and

* and *′ each independently indicate a binding site to a metal.

6. The organic light-emitting device of claim 4 , wherein the second component comprises at least one compound selected from Compounds EI-1 to EI-9:

7. The organic light-emitting device of claim 1 , wherein the third component comprises at least one selected from lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium(Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), or any combination thereof.

8. The organic light-emitting device of claim 1 , wherein third component comprises Yb.

9. The organic light-emitting device of claim 1 , wherein a volume ratio of the first component:second component is 100-x:x (wherein x is greater than 0, but is less than 100), and

wherein a volume ratio of the first component:third component is 100-y:y (wherein y is greater than 0, but less than 100).

10. The organic light-emitting device of claim 1 , wherein a thickness of the electron injection layer is in a range of from about 2 Å to about 1,000 Å.

11. The organic light-emitting device of claim 1 , wherein the electron injection layer is in direct contact with the second electrode.

12. The organic light-emitting device of claim 1 , wherein the electron injection layer comprises at least one selected from:

a film comprising the second component and the third component both dispersed within a matrix comprising the first component;

a film comprising the first component and the third component both dispersed within a matrix comprising the second component; and

a film comprising the first component and the second component both dispersed within a matrix comprising the third component.

13. The organic light-emitting device of claim 1 , wherein the first layer is in direct contact with the second electrode, and the second layer is disposed between the first layer and the emission layer.

14. The organic fight-emitting device of claim 1 , wherein the second layer is in direct contact with the second electrode, and the first layer is disposed between the second layer and the emission layer.

15. The organic light-emitting device of claim 1 , wherein the first layer is in direct contact with the second layer.

16. The organic light-emitting device of claim 1 , wherein a thickness of each of the first layer and the second layer is in a range of from about 1 Å to about 500 Å.

17. An organic light-emitting device comprising:

a first electrode;

a second electrode facing the first electrode; and

an emission layer disposed between the first electrode and the second electrode; and

an electron transport region between the second electrode and the emission layer,

wherein the electron transport region comprises an electron injection layer comprising a first component comprising RbI or Na, a second component comprising lithium quinolate (LiQ), and a third component comprising Yb,

wherein the electron injection layer comprises a first layer including the second component and a second layer including the first component and the third component in a 1:1 ratio, or

wherein the electron injection layer comprises a first layer including the second component, a second layer including the first component and a third layer including the third component.

18. An organic light-emitting device comprising:

a first electrode;

a second electrode facing the first electrode; and

an emission layer disposed between the first electrode and the second electrode; and

an electron transport region between the second electrode and the emission layer,

wherein the electron transport region comprises an electron injection layer comprising a first component comprising an alkali metal (Group I), a second component comprising an organometallic compound, and a third component comprising a lanthanide metal,

wherein the electron injection layer comprises a first layer including the second component and a second layer including the first component and the third component; or,

wherein the electron injection layer comprises a first layer including the second component, a second layer including the first component and a third layer including the third component.