Display devices with organic-metal mixed layer

• US 6,841,932 B2
• Filed: 04/05/2002
• Issued: 01/11/2005
• Est. Priority Date: 03/08/2001
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Liew, Yoon-Fei, Hu, Nan-Xing, Aziz, Hany, Paine, Anthony J., Popovic, Zoran D.
• Primary Examiner(s): Patel, Nimeshkumar D.
• Assistant Examiner(s): LEURIG, SHARLENE L
• Application Number:
  US10/117,812
• Publication Number:
  US 20020180349A1
• Time in Patent Office: 1,012 Days
• Field of Search: 313/502, 313/503, 313/504, 313/498, 313/499, 313/505, 313/506, 313/511, 313/311, 428/690, 428/917, 428/212, 315/169.3, 359/58, 359/60
• US Class Current: 313/503
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A display device composed of: (a) a cathode; (b) an anode; (c) a luminescent region between the cathode and the anode; and an optional region adjacent one of the electrodes, wherein at least one of the cathode, the anode, the luminescent region, and the optional region includes a metal-organic mixed layer composed of: (i) an inorganic metal containing material, (ii) an organic material, and (iii) optionally, at least one component selected from the group consisting of metals, organic materials, and inorganic materials.

Claims

1. A display device comprising:

(a) a cathode;

(b) an anode; and

(c) a luminescent region between the cathode and the anode;

wherein at least one of the cathode, the anode, and the luminescent region comprises a light absorbing binary metal-organic mixed layer consisting of;

(i) a single inorganic metal containing material, wherein the metal of the inorganic metal containing material is selected from the group consisting of Cu, Ag, Au, Ni, Pd, Pt, Se, and Te, and

(ii) a single organic material

wherein the light absorbing metal-organic mixed layer is selected such that the device reduces light reflection by at least about 30%.

2. The device of claim 1, wherein the metal of the inorganic metal containing material is selected from the group consisting of Cu, Ag, and Au.

3. The device of claim 1, wherein the metal of the inorganic metal containing material is selected from the group consisting of Ni, Pd, and Pt.

4. The device of claim 1, wherein the metal of the inorganic metal containing material is selected from the group consisting of Se and Te.

5. The device of claim 1, wherein the cathode includes the metal-organic mixed layer.

6. The device of claim 1, wherein the cathode includes the metal-organic mixed layer and an electron injection region.

7. The device of claim 1, wherein the cathode includes a capping region.

8. The device of claim 1, wherein the luminescent region includes an organic electroluminescent material.

9. The device of claim 1, wherein the luminescent region includes an inorganic electroluminescent material.

10. The device of claim 1, wherein the node includes the metal-organic mixed layer.

11. The device of claim 1, wherein the anode includes the metal-organic mixed layer and a hole injection region.

12. The device of claim 1, wherein the anode includes a capping region.

13. The device of claim 1, wherein the metal of the inorganic metal containing material is Ag and the organic material is tris(8-hydoxyquinoline)aluminum.

14. The device of claim 1, wherein the device reduces light reflection by at least about 50%.

15. The device of claim 1, wherein the cathode is a single layer consisting of the metal-organic mixed layer.

16. The device of claim 1, wherein the anode is a single layer consisting of the metal-organic mixed layer.

17. A display device comprising:

(a) a cathode;

(b) an anode;

(c) a luminescent region between the cathode and the anode; and

(d) a region adjacent an electrode selected from the group consisting of the cathode and the anode, wherein the region includes a light absorbing metal-organic mixed layer including;

(i) an inorganic metal containing material,

(ii) an organic material, and

(iii) optionally at least one component selected from the group consisting of metals, organic materials, and inorganic materials

wherein the light absorbing metal-organic mixed layer is selected such that the device reduces light reflection by at least about 30%.

18. The device of claim 17, wherein the metal of the inorganic metal containing material is selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Sn, Pb, Sb, Bi, Se, Te, Ce, Nd, Sm, and Eu.

19. The device of claim 17, wherein the electrode includes a capping region.

20. The device of claim 17, wherein the region is a single layer consisting of the metal-organic mixed layer.

21. The device of claim 17, wherein the region comprises a plurality of layers.

22. The device of claim 17, wherein the electrode is the cathode.

23. The device of claim 17, wherein the electrode is the anode.

24. The device of claim 17, wherein the metal-organic mixed layer includes tris(8-hydroxyquinoline)aluminum and the metal in the inorganic metal containing material is Ag.

25. The device of claim 17, wherein the device reduces light reflection by at least about 50%.

26. A display device comprising:

(a) a cathode;

(b) an anode; and

(c) a luminescent region between the cathode and the anode;

wherein at least one of the cathode, the anode, and the luminescent region comprises a light absorbing metal-organic mixed layer including;

(i) an inorganic metal containing material,

(ii) an organic material, and

(iii) at least one component selected from the group consisting of metals, organic materials, and inorganic materials

wherein the light absorbing metal-organic mixed layer is selected such that the device reduces light reflection by at least about 30%.

27. The device of claim 26, wherein the metal of the inorganic metal containing material and the metals are selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Sn, Pb, Sb, Bi, Se, Te, Ce, Nd, Sm, and Eu.

28. The device of claim 26, wherein the cathode includes the metal-organic mixed layer.

29. The device of claim 26, wherein the cathode includes the metal-organic mixed layer and an electron injection region.

30. The device of claim 26, wherein the cathode includes a capping region.

31. The device of claim 26, wherein the luminescent region includes an organic electroluminescent material.

32. The device of claim 26, wherein the luminescent region includes an inorganic electroluminescent material.

33. The device of claim 26, wherein the node includes the metal-organic mixed layer.

34. The device of claim 26, wherein the anode includes the metal-organic mixed layer and a hole injection region.

35. The device of claim 26, wherein the anode includes a capping region.

36. The device of claim 26, wherein the cathode includes the metal-organic mixed layer and the metal-organic mixed layer includes tris(8-hydroxyquinoline)aluminum, Ag, and Ca.

37. The device of claim 26, wherein the cathode includes the metal-organic mixed layer and the metal-organic mixed layer includes tris(8-hydroxyquinoline)aluminum, Ag, Ca, and LiF.

38. The device of claim 26, wherein the cathode includes the metal-organic mixed layer and the metal-organic mixed layer includes tris(8-hydroxyquinoline)aluminum, Ag, Mg, and LiF.

39. The device of claim 26, wherein the device reduces light reflection by at least about 50%.

40. The device of claim 26, wherein the cathode is single layer consisting of the metal-organic mixed layer.

41. The device of claim 26, wherein the anode is a single layer consisting of the metal-organic mixed layer.

42. An electroluminescent device comprising

(a) a cathode;

(b) an anode; and

(c) a luminescent region including an organic electroluminescent material between the cathode and the anode;

wherein the cathode comprises a light absorbing metal-organic mixed layer including;

(i) a metal,

(ii) an organic material, and

(iii) at least one component selected from the group consisting of metals, organic materials, and inorganic materials

wherein the light absorbing metal-organic mixed layer is selected such that the device reduces light reflection by at least about 30%.

43. The device of claim 42, wherein the cathode includes a plurality of layers with the metal-organic mixed layer being in contact with the luminescent region.

44. The device of claim 42, wherein the metal and the metals are selected from the group consisting of Mg, Ag, Al, In, Ca, Sr, Au, Li, Cr.

45. The device of claim 42, wherein the inorganic materials are selected from the group consisting of SiO, SiO₂, LiF, and MF₂.

46. The device of claim 42, wherein the organic materials include tris(8-hydroxyquinolinate)aluminum.

47. The device of claim 42, wherein the metal-organic mixed layer includes Mg, tris(8-hydroxyquinolinate)aluminum, and Ag.

48. The device of claim 42, wherein the device reduces light reflection by at least about 50%.

49. The device of claim 42, wherein the cathode is a single layer consisting of the metal-organic mixed layer.