Organic Electroluminescent Device With Delayed Fluorescence

• US 20140131665A1
• Filed: 11/12/2012
• Published: 05/15/2014
• Est. Priority Date: 11/12/2012
• Status: Abandoned Application

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Xia, Chuanjun, Brooks, Jason, Esler, James, Kwong, Raymond, Wong, Ken-Tsung
• Application Number:
  US13/674,696
• Publication Number:
  US 20140131665A1
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1059 containing three nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1088 containing oxygen as the only heteroatom
• CPC Class Codes: C09K 2211/1092 containing sulfur as the only heteroatom
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2101/27 Combination of fluorescent and phosphorescent emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/654 comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: H10K 85/655 comprising only sulfur as heteroatom
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

Novel electroluminescent devices containing bicarbazole triazine compounds as emissive dopants are described. Devices incorporating this class of compounds exhibit delayed fluorescence characteristics that showed EQE'"'"'s far exceeding the theoretical limit for a conventional fluorescent device.

Claims

1. A first device comprising a first organic light emitting device, further comprising:

an anode;

a cathode; and

an emissive layer, disposed between the anode and the cathode, comprising a first emissive dopant;

wherein the first emissive dopant comprises a compound having the formula;

2. The first device of claim 1, wherein the first emissive dopant is a delayed fluorescence emissive dopant.

3. The first device of claim 1, wherein Ar₁, Ar₂, and Ar₃ are further substituted.

4. The first device of claim 1, wherein Ar₁, Ar₂, and Ar₃ are independently selected from the group consisting of phenyl, pyridine, naphthalene, biphenyl, terphenyl, fluorene, dibenzofuran, dibenzothiophene, phenanthrene, and triphenylene;

and

wherein Ar₁, Ar₂, and Ar₃ are independently further substituted with a substituent selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, aryl and heteroaryl, wherein the substituent is not an aryl or heteroaryl fused directly to Ar₁, Ar₂, and Ar₃.

5. The first device of claim 1, wherein Ar₁ and Ar₂ are independently selected from the group consisting of phenyl, pyridine, and naphthalene.

6. The first device of claim 1, wherein Ar₃ is selected from the group consisting of phenyl, biphenyl, dibenzofuran, and dibenzothiophene.

7. The first device of claim 1, wherein R₁ is hydrogen.

8. The first device of claim 1, wherein R₁, R₂, R_3, and R₄ are hydrogen.

9. The first device of claim 1, wherein the compound is selected from the group consisting of:

10. The first device of claim 1, wherein the first device has a maximum external quantum efficiency of at least 10%.

11. The first device of claim 1, wherein the first device has a maximum external quantum efficiency of at least 15%.

12. The first device of claim 1, wherein the first device has an external quantum efficiency of at least 10% at 1000 nits.

13. The first device of claim 1, wherein the first device has an external quantum efficiency of at least 15% at 1000 nits.

14. The first device of claim 1, wherein the emissive layer further comprises a first phosphorescent emitting material.

15. The first device of claim 14, wherein first device emits a white light at room temperature when a voltage is applied across the organic light emitting device.

16. The first device of claim 15, wherein the first emissive dopant emits a blue light having a peak wavelength between about 400 nm to about 500 nm.

17. The first device of claim 15, wherein the first emissive dopant emits a yellow light having a peak wavelength between about 530 nm to about 580 nm.

18. The first device of claim 14, wherein the emissive layer further comprises a second phosphorescent emitting material.

19. The first device of claim 1, wherein the emissive layer further comprises a host compound.

20. The first device of claim 1, wherein the first device comprises a second organic light-emitting device;

wherein the second organic light emitting device is stacked on the first organic light emitting device.

21. The first device of claim 1, wherein the first device is a consumer product.

22. The first device of claim 1, wherein the first device is an organic light-emitting device.

23. The first device of claim 1, wherein the first device is a lighting panel.