OLEDs doped with phosphorescent compounds

Patent metadata

Field	Value
Publication number	US-9508940-B2
Application number	US-201113035051-A
Country	US
Kind code	B2
Filing date	Feb 25, 2011
Priority date	Dec 1, 1997
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

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:

First claim

What is claimed is:

1. An organic light emitting device comprising: an anode, a hole transporting layer, an emissive layer, an electron transporting layer and a cathode, wherein:
the emissive layer is the electron transporting layer, the emissive layer is the hole transporting layer, or the emissive layer is a separate charge-carrying layer between the electron transporting layer and the hole transporting layer;
the emissive layer comprises a charge-carrying material and a phosphorescent material;
the phosphorescent material is present in the emissive layer at a lower concentration than the charge-carrying material;
the phosphorescent material emits phosphorescent radiation from a triplet molecular excited state when a voltage is applied across the device at room temperature; and
wherein the phosphorescent decay rate is rapid enough to meet a switching time requirement of a display device.

2. The organic light emitting device of claim 1 , wherein the emissive layer is the hole transporting layer.

3. The organic light emitting device of claim 1 , wherein the emissive layer is the electron transporting layer.

4. The organic light emitting device of claim 3 , wherein the device is incorporated into an optoelectronic device.

5. The organic light emitting device of claim 4 , wherein the optoelectronic device is incorporated into one of a vehicle, a computer, a television, a printer, a large area wall, a theater or stadium screen, a billboard, or a sign.

6. The organic light emitting device of claim 1 , wherein the emissive layer is a separate charge-carrying layer between the electron transporting layer and the hole transporting layer.

7. The organic light emitting device of claim 1 , wherein the phosphorescent material has a phosphorescent lifetime of no longer than 10 microseconds.

8. The organic light emitting device of claim 7 , wherein the device is incorporated into an optoelectronic device.

9. The organic light emitting device of claim 8 , wherein the optoelectronic device is incorporated into one of a vehicle, a computer, a television, a printer, a large area wall, a theater or stadium screen, a billboard, or a sign.

10. The organic light emitting device of claim 1 , wherein the phosphorescent material is capable of a photoluminescent quantum yield greater than 50% in the solid state.

11. The organic light emitting device of claim 10 , wherein the device is incorporated into an optoelectronic device.

12. The organic light emitting device of claim 11 , wherein the optoelectronic device is incorporated into one of a vehicle, a computer, a television, a printer, a large area wall, a theater or stadium screen, a billboard, or a sign.

13. The organic light emitting device of claim 1 , wherein the device further comprises a hole injecting enhancement layer between the anode and the hole transporting layer.

14. The organic light emitting device of claim 1 , wherein the device further comprises an electron injecting interface layer between the cathode and the electron transporting layer.

15. The organic light emitting device of claim 1 , wherein the phosphorescent material has the chemical structure of formula I:

wherein X is C; R 8 , R 9 , and R 10 are each independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl and substituted aryl; R 9 and R 10 may be combined together to form a fused ring; M 1 is Pt; a is 1; b is 0; and c is 1.

16. The organic light emitting device of claim 15 , wherein the phosphorescent material has the chemical structure:

wherein Et is an ethyl group.

17. The organic light emitting device of claim 1 , wherein the device is incorporated into an optoelectronic device.

18. The organic light emitting device of claim 17 , wherein the optoelectronic device is incorporated into one of a vehicle, a computer, a television, a printer, a large area wall, a theater or stadium screen, a billboard, or a sign.

19. The organic light emitting device of claim 1 , wherein the phosphorescent decay rate is less than about 10 μsec.

20. The organic light emitting device of claim 1 , wherein the phosphorescent radiation produces a primary color.

21. The organic light emitting device of claim 20 , wherein the primary color is red.

22. The organic light emitting device of claim 1 , wherein the emissive layer is vacuum deposited.

23. The organic light emitting device of claim 1 , wherein the emissive layer is vapor deposited.

Assignees

• Thompson Mark E
• You Yujian
• Shoustikov Andrei
• Sibley Scott
• Burrows Paul E
• Forrest Stephen R
• Univ Princeton
• Univ Southern California

Inventors

• Thompson Mark E
• You Yujian
• Shoustikov Andrei
• Sibley Scott
• Burrows Paul E
• Forrest Stephen R

Classifications

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K85/341

  Transition metal complexes, e.g. Ru(II)polypyridine complexes (H10K85/331 takes precedence) · CPC title

• C07D487/22 Primary

  in which the condensed system contains four or more hetero rings · CPC title

• C09K2211/1074

  containing more than three nitrogen atoms as heteroatoms · CPC title

• H01L51/0084 Primary

  Electricity · mapped topic