White electroluminescent device with anthracene derivative host

• US 20060019116A1
• Filed: 07/22/2004
• Published: 01/26/2006
• Est. Priority Date: 07/22/2004
• Status: Abandoned Application

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Hatwar, Tukaram K., Conley, Scott R.
• Application Number:
  US10/897,357
• Publication Number:
  US 20060019116A1
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1014 bridged by heteroatoms, e.g. N, P, Si or B
• CPC Class Codes: C09K 2211/1033 with oxygen
• CPC Class Codes: C09K 2211/1037 with sulfur
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1088 containing oxygen as the only heteroatom
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree

Abstract

An OLED device for emitting white light comprises adjacent layers 1 and 2 wherein layer 1 contains a host and a yellow, orange, or red emitter and layer 2 contains a host and a blue or blue-green light emitter wherein the host in layer 2 comprises an anthracene material bearing an aromatic ring bonded to the 2-, 9-, and 10-positions of the anthracene nucleus.

Claims

1. An OLED device for emitting white light comprising adjacent layers 1 and 2 wherein layer 1 contains a host and a yellow, orange, or red emitter and layer 2 contains a host and a blue or blue-green light emitter wherein the host in layer 2 comprises an anthracene material bearing an aromatic ring bonded to the 2-, 9-, and 10-positions of the anthracene nucleus.

2. The device of claim 1 wherein the layer 1 host comprises an aromatic tertiary amine, a metal-chelated oxinoid compound, an anthracene, or a benzazole compound.

3. The device of claim 1 wherein the layer 1 host comprises a tetracene, naphthacene, rubrene, quinacridone, coumarin, anthracene, fluorene, periflanthene, xanthene, rhodamine, dicyanomethylenepyran, thiopyran, pyrylium, thiapyrylium, or an indenoperylene compound.

4. A device of claim 1 wherein layer 1 host comprises an aromatic tertiary amine compound and a rubrene compound.

5. The device of claim 1 wherein the light emitter in layer 2 comprises a perylene, distyrylarene, or a boron atom containing compound.

6. The device of claim 1 wherein the anthracene host material in layer 2 comprises at least one 2-naphthyl group.

7. The device of claim 1 wherein the anthracene host material in layer 2 comprises independently selected naphthyl groups in the 9- and 10-positions.

8. The device of claim 7, wherein the naphthyl groups are independently selected 2-naphthyl groups.

9. The device of claim 7, wherein the naphthyl groups in the 9- and 10-positions are the same groups.

10. The device of claim 1 wherein the anthracene host material in layer 2 comprises a biphenyl group in the 10-position.

11. The device of claim 1, wherein the 6-position of the anthracene host material bears a hydrogen.

12. The device of claim 1, wherein the aromatic ring in the 2-position of the anthracene is a monocyclic phenyl group, a naphthyl group or a biphenyl group.

13. The device of claim 1, wherein the anthracene host material in layer 2 comprises only one anthracene moiety.

14. The device of claim 1, wherein the anthracene host material in layer 2 comprises two anthracene moieties.

15. The device of claim 1, wherein the anthracene host material is represented by Formula (1),

Ar₂ represents an aryl group;

Ar₉ represents a naphthyl group;

Ar₁₀ represents an aryl group; and

v₁, v₃, v₄, v₅, v₆, v₇, and v₈ independently represent hydrogen or a substituent.

16. The device of claim 15, wherein Ar₉ and Ar₁₀ represent independently selected naphthyl groups.

17. The device of claim 15, wherein Ar₁₀ represents a biphenyl group.

18. The device of claim 15, wherein Ar₂ represents a naphthyl or biphenyl group.

19. The device of claim 15, wherein Ar₂ represents a monocyclic phenyl group.

20. The device of claim 1, wherein a light-emitting layer includes a green-light emitting material.

21. The device of claim 1, wherein a light-emitting layer includes a material of Formula (2a) or (2b),

wherein:

R^a-R^h independently represent hydrogen or an independently selected substituent.

22. The device of claim 1 wherein a light-emitting layer includes a compound represented by Formula (3a),

wherein:

W represents N or C—

Y, wherein Y represents hydrogen or a substituent;

Ar^a and Ar^b independently represent the atoms necessary to form an aromatic ring group; and

Z^a and Z^b represent independently selected substituents.

23. The device of claim 1 wherein a light emitting layer includes a perylene compound.

24. The device of claim 23 wherein a light-emitting layer includes a compound having the nucleus:

25. The device of claim 1 wherein a light-emitting layer includes a rubrene compound.

26. The device of claim 25 wherein a light-emitting layer includes

27. The device of claim 1 wherein a light emitting layer includes an indenoperylene compound.

28. The device of claim 27 wherein a light-emitting layer includes a compound having the nucleus:

29. The device of claim 1 wherein a light-emitting layer includes a dicyanomethylenepyran compound.

30. The device of claim 29 wherein a light-emitting layer includes

31. The device of claim 1 wherein the anthracene material is selected from the following:

32. A device of claim 1 wherein the yellow, orange or red light-emitting materials are incorporated at 0.01 to 10% by weight of the host material.

33. A device of claim 1 wherein the yellow, orange or red light-emitting materials are incorporated at 1% to 5% by weight of the host material.

34. A device of claim 1 wherein the blue or blue-green light-emitting materials are incorporated at 0.01 to 10% by weight of the host material.

35. A device of claim 1 wherein the blue or blue-green light-emitting materials are incorporated at 0.5% to 5% by weight of the host material.

36. The device of claim 1 wherein white light is produced either directly or by using filters.

37. A display comprising the electroluminescent device of claim 1.

38. An area lighting device comprising the electroluminescent device of claim 1.

39. A process for emitting light comprising applying a potential across the device of claim 1.

40. A device of claim 1 wherein a yellow, orange or red light-emitting layer is located closer to the anode than a blue or blue-green emitting layer.

41. A device of claim 1 wherein a yellow, orange or red light-emitting layer is located closer to the cathode than a blue or blue-green emitting layer.

42. A device of claim 1 comprising at least three light emitting layers.

43. A device of claim 42 wherein two or more adjacent layers emit the same color.

44. A device of claim 42 wherein two or more layers emitting the same color are separated by a layer emitting a different color.

45. A device of claim 1 comprising a hole-transporting material in the yellow, orange, or red light-emitting layer.

46. A device of claim 1 comprising a hole-transporting material in the blue or blue-green light-emitting layer.

47. A device of claim 1 comprising an electron-transporting material in the yellow, orange, or red light-emitting layer.

48. A device of claim 1 comprising an electron-transporting material in the blue or blue-green light-emitting layer.

49. A device of claim 1 wherein the host or light-emitting materials comprise polymeric materials.

50. A device of claim 1 wherein the light-emitting materials comprise phosphorescent materials.