Organic electroluminescence device and method of manufacturing the same

1. An organic electroluminescence device, comprising:

a substrate;

a first electrode formed on the substrate;

an organic layer formed on the first electrode, the organic layer including at least an organic light-emitting layer; and

a second electrode formed on the organic layer,

wherein the second electrode is made of an Mg-Ag layer having a thickness in a range of 170Å to 200 Å, the atomic ratio of Mg to Ag being not greater than 25:1, and

wherein a conductive oxide is not disposed directly on the second electrode,

wherein a value of Y in the color coordinate system is 0 . 200 or less when the organic electroluminescence device emits blue light.

2. The organic electroluminescence device of claim 1 , wherein the thickness of the second electrode is in a range of 180Å to 200 Å.

3. The organic electroluminescence device of claim 1 , wherein the second electrode contains Mg and Ag in an atomic ratio of 10:1.

4. The organic electroluminescence device of claim 1 , wherein the second electrode serves as a cathode electrode.

5. The organic electroluminescence device of claim 1 , further comprising a passivation layer formed on the second electrode.

6. The organic electroluminescence device of claim 5 , wherein the passivation layer is one of an organic material layer, an inorganic material layer, and a multilayer thereof.

7. The organic electroluminescence device of claim 6 , wherein the inorganic material layer is one film selected from the group consisting of a silicon oxide film (SiO 2 ), a silicon nitride film (SiN x ), and a silicon oxynitride film (SiO x N y ).

8. The organic electroluminescence device of claim 1 , further comprising an LiF layer formed between the second electrode and the organic layer.

9. The organic electroluminescence device of claim 6 , wherein the organic material layer is a layer containing at least one material selected from the group consisting of N,N′-Bis(naphthalene-1-yl)—N,N′-bis(phenyl)benzidine (NPB), TNATA, TCTA, TDAPB, 4,4′,4″-Tris(N,N′-diphenyl-amino)-triphenylamine (TDATA), Alq 3 , BAlq, and CPB.

10. The organic electroluminescence device of claim 1 , wherein the organic layer further includes at least one of a hole blocking layer, an electron transport layer, and an electron injecting layer formed between the second electrode and the organic light-emitting layer.

11. The organic electroluminescence device of claim 1 , wherein the organic layer further includes at least one of a hole injecting layer and a hole transport layer formed between the first electrode and the organic light-emitting layer.

12. An organic electroluminescence device, comprising:

a substrate;

a first electrode formed on the substrate;

an organic layer formed on the first electrode, the organic layer including at least an organic light-emitting layer; and

a second electrode formed on the organic layer,

wherein the second electrode is made of an Mg-Ag layer,

wherein a thickness of the Mg-Ag layer is in a range of 170 Å to 200 Å,

wherein a conductive oxide is not disposed directly on the second electrode, and

wherein the organic electroluminescence device has a light transmittance in a range of 20% to 35%.

13. The organic electroluminescence device of claim 12 , wherein the thickness of the Mg-Ag layer is in a range of 180 Å to 200 Å.

14. The organic electroluminescence device of claim 12 , wherein the Mg-Ag layer has an atomic ratio of Mg to Ag not greater than 25:1.

15. The organic electroluminescence device of claim 14 , wherein the Mg-Ag layer has an atomic ratio of Mg to Ag of 10:1.

16. The organic electroluminescence device of claim 12 , wherein the second electrode serves as a cathode electrode.

17. The organic electroluminescence device of claim 12 , further comprising a passivation layer formed on the second electrode.

18. The organic electroluminescence device of claim 17 , wherein the passivation layer is one of an organic material layer, an inorganic material layer, and a multilayer thereof.

19. The organic electroluminescence device of claim 18 , wherein the inorganic material layer is one film selected from the group consisting of a silicon oxide (SiO 2 ) film, a silicon nitride (SiN x ) film, and a silicon oxynitride (SiO x N y ) film.

20. The organic electroluminescence device of claim 12 , further comprising an LiF layer formed between the second electrode and the organic layer.

21. The organic electroluminescence device of claim 18 , wherein the organic material layer is a layer containing at least one material selected from the group consisting of N,N′-Bis(naphthalene-1-yl)—N,N′-bis(phenyl)benzidine (NPB), TNATA, TCTA, TDAPB, 4,4′,4″-Tris(N,N′—diphenyl-amino)-triphenylamine (TDATA), Alq 3 , BAlq, and CPB.

22. The organic electroluminescence device of claim 12 , wherein the organic layer further includes at least one of a hole blocking layer, an electron transport layer, and an electron injecting layer formed between the second electrode and the organic light-emitting layer.

23. The organic electroluminescence device of claim 12 , wherein the organic layer further includes at least one of a hole injecting layer and a hole transport layer formed between the first electrode and the organic light-emitting layer.

24. The organic electroluminescence device of claim 12 , wherein when the organic electroluminescence device emits blue light, a value of Y in the color coordinate system is 0.200 or less.

25. A method of manufacturing an organic electroluminescence device, comprising:

forming a first electrode on a substrate;

forming on the first electrode an organic layer including at least an organic light-emitting layer; and

forming on the organic layer a second electrode made of an Mg-Ag layer having a thickness in a range of 170Å to 200 Å,

wherein a conductive oxide is not formed directly on the second electrode, and

wherein the organic electroluminescence device has a light transmittance in a range of 20% to 35%.

26. The method of claim 25 , wherein forming the second electrode comprises co-depositing Mg and Ag.