OLEDs doped with phosphorescent compounds

• US 7,279,235 B2
• Filed: 02/18/2005
• Issued: 10/09/2007
• Est. Priority Date: 12/01/1997
• Status: Expired due to Fees

• Current Assignee: The Trustees of Princeton University (Princeton University), University of Southern California
• Original Assignee: The Trustees of Princeton University (Princeton University), University of Southern California
• Inventors: Burrows, Paul E., Forrest, Stephen R., Sibley, Scott, Thompson, Mark E., You, Yujian, Shoustikov, Andrei
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US11/061,832
• Publication Number:
  US 20050158584A1
• Time in Patent Office: 963 Days
• Field of Search: 428/690, 428/917, 313/504, 313/506, 257/102
• US Class Current: 428/690
• CPC Class Codes: C07D 487/22 in which the condensed system contains four or more hetero rings
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/10 Non-macromolecular compounds
• CPC Class Codes: C09K 2211/1003 Carbocyclic compounds
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1018 Heterocyclic compounds
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1033 with oxygen
• CPC Class Codes: C09K 2211/1074 containing more than three nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/18 Metal complexes
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: C09K 2211/186 of the light metals other than alkali metals and alkaline earth metals, i.e. Be, Al or Mg
• 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: H05B 33/28 of translucent electrodes
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 59/80524 : Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 85/30 : Coordination compounds
• CPC Class Codes: H10K 85/324 : comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/341 : Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/346 : comprising platinum
• CPC Class Codes: H10K 85/621 : Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide
• CPC Class Codes: H10K 85/654 : comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: Y10S 428/917 : Electroluminescent
• CPC Class Codes: Y10T 428/24942 : including components having same physical characteristic in differing degree

Abstract

Organic light emitting devices are Disclosed which are comprised of a heterostructure for producing electroluminescence wherein the heterostructure is comprised of an emissive layer containing a phosphorescent dopant compound. For example, the phosphorescent dopant compound may be comprised of platinum octaethylporphine (PtOEP), which is a compound having the chemical structure with the formula:

Claims

1. An organic light emitting device comprising an anode, a cathode and an emissive layer, wherein the emissive layer is located between the anode and the cathode, and the emissive layer comprises a phosphorescent material and a charge carrying host material, wherein the phosphorescent material emits phosphorescent radiation from a triplet molecular excited state when a voltage is applied across the organic light emitting device, and wherein the organic light emitting device is capable of being used in a member of the group consisting of a display device, a vehicle, a computer, a television, a printer, a large area wall screen, a theater screen, a stadium screen, a billboard, and a sign.

2. The device of claim 1 herein the phosphorescent material is capable of having a photoluminescent quantum yield greater than 50% at room temperature in the solid state.

3. The device of claim 1 wherein the organic light emitting device is capable of a display brightness in excess of 10 cd/m².

4. The device of claim 1 wherein the charge carrying host material is a hole transporting material.

5. The device of claim 1 wherein the charge carrying host material is an electron transporting material.

6. The device of claim 1 wherein the phosphorescent material has a phosphorescent lifetime not longer than about 10 microseconds.

7. The device of claim 1 wherein the phosphorescent material has a phosphorescent lifetime from about 10 to about 100 microseconds.

8. The device of claim 1 wherein the phosphorescent material has the chemical structure of formula I:

9. The device of claim 8 wherein the phosphorescent material is platinum octaethylporphine and has the chemical structure with the formula:

10. The device of claim 8 wherein X is C, and M₁ is Pt.

11. A display device comprising the device of claim 1.

12. A vehicle comprising the device of claim 1.

13. A computer comprising the device of claim 1.

14. A television comprising the device of claim 1.

15. A printer comprising the device of claim 1.

16. A large area wall screen comprising the device of claim 1.

17. A theater screen comprising the device of claim 1.

18. A stadium screen comprising the device of claim 1.

19. A billboard comprising the device of claim 1.

20. A sign comprising the device of claim 1.