Organic light emitting diode including light-efficiency-improvement layer

1. An organic light emitting diode comprising:

a substrate;

a first electrode defining first and second surfaces opposite one another, the second surface facing the substrate;

an organic layer facing the first surface of the first electrode;

a second electrode defining first and second surfaces opposite one another, the first surface facing the organic layer; and

a light-efficiency-improvement layer in contact with at least one of the second surface of the first electrode or the second surface of the second electrode and comprising a compound represented by Formula 1:

where

Ar is a substituted or unsubstituted C 6 -C 30 aromatic ring system or a substituted or unsubstituted C 2 -C 30 hetero aromatic ring system;

each L 1 is independently selected from the group consisting of substituted or unsubstituted C 1 -C 30 alkylene groups, substituted or unsubstituted C 6 -C 30 arylene groups, and substituted or unsubstituted C 2 -C 30 hetero arylene groups;

X 1 is N, CY 1 , or a carbon atom bonded to L 1 or Ar;

X 2 is N, CY 2 , or a carbon atom bonded to L 1 or Ar;

X 3 is N, CY 3 , or a carbon atom bonded to L 1 or Ar;

X 4 is N;

X 5 is a carbon atom;

X 6 is N or CY 6 ;

wherein one of X 1 , X 2 , and X 3 is a carbon atom bonded to L 1 or Ar;

each of R 1 through R 3 , Y 1 through Y 3 , and Y 6 is independently selected from the group consisting of a hydrogen atom, halogen atoms, a hydroxyl group, a cyano group, substituted or unsubstituted C 1 -C 30 alkyl groups, substituted or unsubstituted C 1 -C 30 alkoxy groups, substituted or unsubstituted C 1 -C 30 acyl groups, substituted or unsubstituted C 2 -C 30 alkenyl groups, substituted or unsubstituted C 2 -C 30 alkynyl groups, substituted or unsubstituted C 6 -C 30 aryl groups, and substituted or unsubstituted C 2 -C 30 hetero aryl groups, wherein two or more adjacent elements selected from R 1 through R 3 , Y 1 through Y 3 , and Y 6 may be bonded to each other to form a saturated or unsaturated ring;

a is an integer from 0 to 10;

m is an integer from 1 to 5; and

n is an integer from 1 to 10.

2. The organic light emitting diode of claim 1 , wherein Ar is selected from the group consisting of substituted or unsubstituted pentalenes, substituted or unsubstituted indenes, substituted or unsubstituted naphthalenes, substituted or unsubstituted azulenes, substituted or unsubstituted heptalenes, substituted or unsubstituted indacenes, substituted or unsubstituted acenaphthylenes, substituted or unsubstituted fluorenes, substituted or unsubstituted phenalenes, substituted or unsubstituted phenanthrenes, substituted or unsubstituted anthracenes, substituted or unsubstituted fluoranthenes, substituted or unsubstituted triphenylenes, substituted or unsubstituted pyrenes, substituted or unsubstituted chrysenes, substituted or unsubstituted naphthacenes, substituted or unsubstituted picenes, substituted or unsubstituted perylenes, substituted or unsubstituted pentaphenes, substituted or unsubstituted hexacenes, substituted or unsubstituted pyrroles, substituted or unsubstituted pyrazoles, substituted or unsubstituted imidazoles, substituted or unsubstituted imidazolines, substituted or unsubstituted pyridines, substituted or unsubstituted pyrazines, substituted or unsubstituted pyrimidines, substituted or unsubstituted indoles, substituted or unsubstituted purines, substituted or unsubstituted quinolines, substituted or unsubstituted phthalazines, substituted or unsubstituted indolizines, substituted or unsubstituted naphthyridines, substituted or unsubstituted quinazolines, substituted or unsubstituted cinnolines, substituted or unsubstituted indazoles, substituted or unsubstituted carbazoles, substituted or unsubstituted phenazines, substituted or unsubstituted phenanthridines, substituted or unsubstituted pyrans, substituted or unsubstituted chromenes, substituted or unsubstituted benzofurans, substituted or unsubstituted thiophenes, substituted or unsubstituted benzothiophenes, substituted or unsubstituted isothiazoles, and substituted or unsubstituted isoxazoles.

3. The organic light emitting diode of claim 1 , wherein, when Ar is a substituted C 6 -C 30 aromatic ring system or a substituted C 2 -C 30 hetero aromatic ring system, a substituent is selected from the group consisting of substituted or unsubstituted C 6 -C 14 aryl groups and substituted or unsubstituted C 2 -C 14 hetero aryl groups.

4. The organic light emitting diode of claim 1 , wherein, when Ar is a substituted C 6 -C 30 aromatic ring system or a substituted C 2 -C 30 hetero aromatic ring system, a substituent is selected from the group consisting of phenyl groups, halophenyl groups, C 1 -C 10 alkylphenyl groups, C 1 -C 10 alkoxyphenyl groups, naphthyl groups, halonaphthyl groups, C 1 -C 10 alkylnaphthyl groups, C 1 -C 10 alkoxynaphthyl groups, pyridinyl groups, halopyridinyl groups, C 1 -C 10 alkylpyridinyl groups, C 1 -C 10 alkoxypyridinyl groups, quinolinyl groups, haloquinolinyl groups, C 1 -C 10 alkylquinolinyl groups, C 1 -C 10 alkoxyquinolinyl groups, isoquinolinyl groups, haloisoquinolinyl groups, C 1 -C 10 alkylisoquinolinyl groups, and C 1 -C 10 alkoxyisoquinolinyl groups.

5. The organic light emitting diode of claim 1 , wherein each L 1 is independently selected from the group consisting of substituted or unsubstituted C 6 -C 14 arylene groups and substituted or unsubstituted C 2 -C 14 hetero arylene groups.

6. The organic light emitting diode of claim 1 , wherein each L 1 is independently selected from the group consisting of phenylene groups, halophenylene groups, C 1 -C 10 alkylphenylene groups, C 1 -C 10 alkoxyphenylene groups, naphthylene groups, halonaphthylene groups, C 1 -C 10 alkylnaphthylene groups, and C 1 -C 10 alkoxynaphthylene groups.

7. The organic light emitting diode of claim 1 , wherein - (L 1 ) a - is represented by any one formula selected from Formulae 2 a through 2 g :

8. The organic light emitting diode of claim 1 , wherein at least one of X 1 , X 4 and X 6 is N.

9. The organic light emitting diode of claim 1 , wherein each of X 1 and X 4 is N.

10. The organic light emitting diode of claim 1 , wherein each of X 1 , X 4 and X 6 is N.

11. The organic light emitting diode of claim 1 , wherein each of R 1 through R 3 , Y 1 through Y 3 , and Y 6 is independently selected from the group consisting of a hydrogen atom, substituted or unsubstituted C 1 -C 10 alkyl groups, substituted or unsubstituted C 2 -C 10 alkenyl groups, substituted or unsubstituted C 6 -C 14 aryl groups, and C 2 -C 14 hetero aryl groups.

12. The organic light emitting diode of claim 1 , wherein each of R 1 through R 3 , Y 1 through Y 3 , and Y 6 is independently selected from the group consisting of a hydrogen atom, C 1 -C 10 alkyl groups, C 1 -C 10 halo alkyl groups, C 2 -C 10 alkenyl groups, C 2 -C 10 halo alkenyl groups, phenyl groups, halophenyl groups, C 1 -C 10 alkylphenyl groups, C 1 -C 10 alkoxyphenyl groups, naphthyl groups, halonaphthyl groups, C 1 -C 10 alkylnaphthyl groups, and C 1 -C 10 alkoxynaphthyl groups.

13. The organic light emitting diode of claim 1 , wherein n is 1 or 2.

14. The organic light emitting diode of claim 1 , wherein the compound represented by Formula 1 is a compound represented by any one formula selected from Formulae 1A through 1X:

where

each of Q 1 through Q 11 is independently selected from the group consisting of a hydrogen atom, substituted or unsubstituted C 6 -C 14 aryl groups, and substituted or unsubstituted C 2 -C 14 hetero aryl groups;

each of L 1 is independently selected from the group consisting of substituted or unsubstituted C 6 -C 14 arylene groups and substituted or unsubstituted C 2 -C 14 hetero arylene groups;

each of R 1 , R 2 , R 3 , Y 2 and Y 3 is independently selected from the group consisting of a hydrogen atom, substituted or unsubstituted C 1 -C 10 alkyl groups, substituted or unsubstituted C 2 -C 10 alkenyl groups, substituted or unsubstituted C 6 -C 14 aryl groups, and C 2 -C 14 hetero aryl groups, wherein two or more adjacent elements selected from R 1 through R 3 , Y 2 , Y 3 , and Y 6 may be bonded to each other to form a C 6 -C 12 aromatic ring; and

a is 1 or 2.

15. The organic light emitting diode of claim 14 , wherein Q 1 through Q 11 are each independently a hydrogen atom, a phenyl group, a halophenyl group, a C 1 -C 10 alkylphenyl group, a C 1 -C 10 alkoxyphenyl group, a naphthyl group, a halonaphthyl group, a C 1 -C 10 alkylnaphthyl group, a C 1 -C 10 alkoxynaphthyl group, a pyridinyl group, a halopyridinyl group, a C 1 -C 10 alkylpyridinyl group, a C 1 -C 10 alkoxypyridinyl group, a quinolinyl group, a haloquinolinyl group, a C 1 -C 10 alkylquinolinyl group, a C 1 -C 10 alkoxyquinolinyl group, an isoquinolinyl group, a haloisoquinolinyl group, a C 1 -C 10 alkylisoquinolinyl group, or a C 1 -C 10 alkoxyisoquinolinyl group.

16. The organic light emitting diode of claim 1 , wherein the second electrode is a transmission-type electrode and the light-efficiency-improvement layer is in contact with the second surface of the second electrode.

17. The organic light emitting diode of claim 1 , wherein the first electrode is a transmission-type electrode and the light-efficiency-improvement layer is in contact with the second surface of the first electrode.

18. The organic light emitting diode of claim 1 , wherein the first electrode and the second electrode are transmission-type electrodes and a light-efficiency-improvement layer is in contact with the second surface of the first electrode and a light-efficiency-improvement layer is in contact with the second surface of the second electrode.

19. The organic light emitting diode of claim 1 , wherein the organic layer is individually formed corresponding to R, G and B pixels and the light-efficiency-improvement layer is a common layer with respect to the R, G and B pixels.

20. The organic light emitting diode of claim 1 , wherein the organic layer is individually formed corresponding to R, G and B pixels and the light-efficiency-improvement layer comprises at least one layer selected from the group consisting of a light-efficiency-improvement layer-R formed corresponding to the R pixel, a light-efficiency-improvement layer-G formed corresponding to the G pixel, and a light-efficiency-improvement layer-B formed corresponding to the B pixel.

21. The organic light emitting diode of claim 20 , wherein the light-efficiency-improvement layer comprises the light-efficiency-improvement layer-R, the light-efficiency-improvement layer- G, and the light-efficiency-improvement layer-B.

22. The organic light emitting diode of claim 21 , wherein the light-efficiency-improvement layer-R, the light-efficiency-improvement layer-G and the light-efficiency-improvement layer-B have the same or different thicknesses.