Dual emitting dyads of heavy metal complexes as broad band emitters for organic LEDs

• US 20050164031A1
• Filed: 03/24/2004
• Published: 07/28/2005
• Est. Priority Date: 01/26/2004
• Status: Abandoned Application

• Current Assignee: University of Southern California
• Original Assignee: University of Southern California
• Inventors: Ma, Biwu, Thompson, Mark E., Djurovich, Peter
• Application Number:
  US10/807,739
• Publication Number:
  US 20050164031A1
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: C07F 15/0033 Iridium compounds
• CPC Class Codes: C07F 15/0086 Platinum compounds
• CPC Class Codes: C07F 15/0093 without a metal-carbon linkage
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• 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 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/346 comprising platinum
• CPC Class Codes: H10K 85/361 Polynuclear complexes, i.e. complexes comprising two or more metal centers

Abstract

An organic light emitting device is provided. The device has an anode, a cathode, and an emissive layer disposed between and electrically connected to the anode and the cathode. The emissive layer further comprises a compound having two metal centers, in which each metal has an atomic weight greater than 40. A bridging ligand, small molecule, or polymer is coordinated to both metal centers, and at least one photoactive ligand is bound to each metal. In one embodiment, the transition dipole moment of the photoactive ligand bound to the first metal is orthogonal to the photoactive ligand bound to the second metal. In another embodiment, the first metal center and the atoms of the bridging ligand that are coordinated to the first metal center form a plane and the atoms of the bridging ligand that are coordinated to the second metal center form another plane, and the planes form an angle that is between about 80 degrees and 100 degrees. In another embodiment, the bridging ligand is diacetylacetonate. In another embodiment, a polymer or small molecule is coordinated to both metals, and the metal-ligand complex for the first metal center is different from the metal-ligand complex for the second metal center.

Claims

1. A compound, comprising:

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40; and

a bridging ligand coordinated to the first metal center and the second metal center; and

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center; and

wherein the transition dipole moment of the first photoactive ligand is orthogonal to the transition dipole moment of the second photoactive ligand.

2. The compound of claim 1, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

3. The compound of claim 1, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 550-600 nm.

4. The compound of claim 3, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

5. The compound of claim 1, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 500-520 nm.

6. The compound of claim 1, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength greater than 590 nm.

7. The compound of claim 1, wherein the first metal is Pt.

8. The compound of claim 7, wherein the second metal is Pt.

9. The compound of claim 8, wherein the bridging ligand comprises the structure:

10. The compound of claim 9, having the structure:

11. The compound of claim 10, having the structure:

12. The compound of claim 10, having the structure:

13. The compound of claim 10, having the structure:

14. The compound of claim 10, having the structure:

15. The compound of claim 10, having the structure:

16. The compound of claim 10, having the structure:

17. The compound of claim 10, having the structure:

18. A compound, comprising:

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40;

a bridging ligand coordinated to the first metal center and the second metal; and

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center; and

wherein the first metal center and the atoms of the bridging ligand that are coordinated to the first metal center define a first plane, and the second metal center and the atoms of the bridging ligand that are coordinated to the second metal center define a second plane, and wherein the first plane and the second plane form an angle that is between about 80 degrees and 100 degrees.

19. The compound of claim 18, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

20. The compound of claim 18, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 550-600 nm.

21. The compound of claim 20, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

22. The compound of claim 18, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 500-520 nm.

23. The compound of claim 18, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength greater than 590 nm.

24. The compound of claim 18, wherein the bridging ligand comprises the structure:

25. The compound of claim 24, wherein the first metal is Pt.

26. A compound, comprising:

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40;

a bridging ligand coordinated to the first metal center and the second metal center further comprising the structure

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center.

27. The compound of claim 26, wherein the first metal and the second metal are the same metal.

28. The compound of claim 27, wherein the first metal is Ir.

29. The compound of claim 28, having the structure:

30. The compound of claim 29, wherein m₁ is 2 and n₁ is zero.

31. The compound of claim 30, wherein m₂ is 2 and n₂ zero.

32. The compound of claim 31, having the structure:

33. A compound, comprising

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40;

a polymer or small molecule coordinated to the first metal center and the second metal; and

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center, wherein the first metal-ligand complex is different from the second metal-ligand complex.

34. The compound of claim 33, wherein the first metal is Pt.

35. The compound of claim 33, wherein the first metal is Ir.

36. The compound of claim 33, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

37. The compound of claim 33, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 550-600 nm.

38. The compound of claim 37, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

39. The compound of claim 33, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 500-520 nm.

40. The compound of claim 33, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength greater than 590 nm.

41. The compound of claim 33, wherein the polymer or small molecule comprises the structure:

42. The compound of claim 41, wherein the first metal is Pt.

43. The compound of claim 42, wherein the second metal is Ir.

44. The compound of claim 43, having the structure:

45. The compound of claim 44, wherein m is 2 and n is zero.

46. The compound of claim 45, having the structure:

47. The compound of claim 45, having the structure:

48. The compound of claim 45, having the structure:

49. The compound of claim 41, wherein the first metal is Ir.

50. The compound of claim 49, having the structure:

51. A compound of claim 50, wherein m₁ is 2 and n₁ is zero.

52. A compound of claim 51, wherein m₂ is 2 and n₂ is zero.

53. The compound of claim 52, having the structure:

54. An organic light emitting device, comprising:

an anode, a cathode, and an emissive layer disposed between and electrically connected to the anode and the cathode, wherein the emissive layer further comprises a compound, comprising;

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40; and

a bridging ligand coordinated to the first metal center and the second metal center; and

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center; and

wherein the transition dipole moment of the first photoactive ligand is orthogonal to the transition dipole moment of the second photoactive ligand.

55. The device of claim 54, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

56. The device of claim 54, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 550-600 nm.

57. The device of claim 56, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

58. The device of claim 54, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 500-520 nm.

59. The device of claim 54, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength greater than 590 nm.

60. The device of claim 54, wherein the first metal is Pt.

61. The device of claim 60, wherein the second metal is Pt.

62. The device of claim 61, wherein the bridging ligand comprises the structure:

63. The device of claim 62, having the structure:

64. The device of claim 63, having the structure:

65. The device of claim 63, having the structure:

66. The device of claim 63, having the structure:

67. The device of claim 63, having the structure:

68. The device of claim 63, having the structure:

69. The device of claim 63, having the structure:

70. The device of claim 63, having the structure:

71. The device of claim 54, wherein the device is incorporated into a consumer product.

72. An organic light emitting device, comprising:

an anode, a cathode, and an emissive layer disposed between and electrically connected to the anode and the cathode, wherein the emissive layer further comprises a compound, comprising;

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40;

a bridging ligand coordinated to the first metal center and the second metal; and

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center; and

wherein the first metal center and the atoms of the bridging ligand that are coordinated to the first metal center define a first plane, and the second metal center and the atoms of the bridging ligand that are coordinated to the second metal center define a second plane, and wherein the first plane and the second plane form an angle that is between about 80 degrees and 100 degrees.

73. The device of claim 72, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

74. The device of claim 72, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 550-600 nm.

75. The device of claim 74, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

76. The device of claim 72, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 500-520 nm.

77. The device of claim 72, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength greater than 590 nm.

78. The device of claim 72, wherein the bridging ligand comprises the structure:

79. The device of claim 78, wherein the first metal is Pt.

80. The device of claim 72, wherein the device is incorporated into a consumer product.

81. An organic light emitting device, comprising:

an anode, a cathode, and an emissive layer disposed between and electrically connected to the anode and the cathode, wherein the emissive layer further comprises a compound, comprising;

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40;

a bridging ligand coordinated to the first metal center and the second metal center further comprising the structure

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center.

82. The device of claim 81, wherein the first metal and the second metal are the same metal.

83. The device of claim 82, wherein the first metal is Ir.

84. The device of claim 83, having the structure:

85. The device of claim 84, wherein m₁ is 2 and n₁ is zero.

86. The device of claim 85, wherein m₂ is 2 and n₂ zero.

87. The device of claim 86, having the structure:

88. The device of claim 81, wherein the device is incorporated into a consumer product.

89. An organic light emitting device, comprising:

an anode, a cathode, and an emissive layer disposed between and electrically connected to the anode and the cathode, wherein the emissive layer further comprises a compound, comprising;

a first metal center and a second metal center, wherein each metal has an atomic weight greater than 40;

a polymer or small molecule coordinated to the first metal center and the second metal; and

at least one photoactive ligand bound to the first metal center, and at least one photoactive ligand bound to the second metal center, wherein the first metal-ligand complex is different from the second metal-ligand complex.

90. The device of claim 89, wherein the first metal is Pt.

91. The device of claim 89, wherein the first metal is Ir.

92. The device of claim 89, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

93. The device of claim 89, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 550-600 nm.

94. The device of claim 93, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength less than 480 nm.

95. The device of claim 89, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength of 500-520 nm.

96. The device of claim 89, wherein at least one photoactive ligand has a triplet energy corresponding to a wavelength greater than 590 nm.

97. The device of claim 89, wherein the polymer or small molecule comprises the structure:

98. The device of claim 97, wherein the first metal is Pt.

99. The device of claim 98, wherein the second metal is Ir.

100. The device of claim 99, having the structure:

101. The device of claim 100, wherein m is 2 and n is zero.

102. The device of claim 101, having the structure:

103. The device of claim 101, having the structure:

104. The device of claim 101, having the structure:

105. The device of claim 94, wherein the first metal is Ir.

106. The device of claim 102, having the structure:

107. A device of claim 106, wherein m₁ is 2 and n₁ is zero.

108. A device of claim 107, wherein m₂ is 2 and n₂ is zero.

109. The device of claim 108, having the structure:

110. The device of claim 89, wherein the device is incorporated into a consumer product.