Organometallic compounds for use in electroluminescent devices

• US 7,429,426 B2
• Filed: 12/03/2004
• Issued: 09/30/2008
• Est. Priority Date: 11/06/2002
• Status: Active Grant

• Current Assignee: Universal Display Corporation, University of Southern California
• Original Assignee: Universal Display Corporation, University of Southern California
• Inventors: Knowles, David B., Ma, Bin, Thompson, Mark E., Kwong, Raymond, Walters, Robert, Tung, Yeh-Jiun, Djurovich, Peter I., Brown, Cory S.
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US11/002,188
• Publication Number:
  US 20050119485A1
• Time in Patent Office: 1,397 Days
• Field of Search: None
• US Class Current: 428/690
• CPC Class Codes: C07F 15/0033 Iridium compounds
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1003 Carbocyclic compounds
• 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 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• 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: Y10S 428/917 Electroluminescent

Abstract

An organic light emitting device is provided. The device has an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer further comprising an emissive material having the structure:

M is a metal having an atomic weight greater than 40. R₅ is an aromatic group. The emissive material itself is also provided. The emissive material provides an improved stability and efficiency.

Claims

1. An emissive material comprising a ligand having the structure:

2. The emissive material of claim 1 comprising a ligand having the structure:

3. The emissive material of claim 1 comprising a ligand having the structure:

4. The emissive material of claim 1 comprising a ligand having the structure:

5. The emissive material of claim 1 comprising a ligand having the structure:

6. The emissive material of claim 1 comprising a ligand having the structure:

7. The emissive material of claim 1 comprising a ligand having the structure:

8. The emissive material of claim 1 comprising a ligand having the structure:

9. The emissive material of claim 1 comprising a ligand having the structure:

10. An emissive material comprising the structure:

11. The emissive material of claim 10 comprising the structure:

12. The emissive material of claim 10 comprising the structure:

13. The emissive material of claim 10 comprising the structure:

14. The emissive material of claim 10 comprising the structure:

15. The emissive material of claim 10 comprising the structure:

16. The emissive material of claim 10 comprising the structure:

17. The emissive material of claim 10 comprising the structure:

18. The emissive material of claim 10 comprising the structure:

19. An organic light emitting device, comprising:

(a) an anode;

(b) a cathode;

(c) an emissive layer disposed between the anode and the cathode, the emissive layer comprising an emissive material comprising a ligand having the structure;

21. The device of claim 19, further comprising an electron transport layer disposed between the cathode and the emissive layer.

20. An organic light emitting device, comprising:

(a) an anode;

(b) a cathode;

(c) an emissive layer disposed between the anode and the cathode, the emissive layer comprising an emissive material having the structure;