Cationic metal-carbene complexes

• US 7,445,855 B2
• Filed: 01/10/2005
• Issued: 11/04/2008
• Est. Priority Date: 05/18/2004
• Status: Active Grant

• Current Assignee: Universal Display Corporation, University of Southern California
• Original Assignee: Universal Display Corporation, University of Southern California
• Inventors: Mackenzie, Peter B., Thompson, Mark E., Walters, Robert, Brooks, Jason
• Primary Examiner(s): Yamnitzky; Marie R.
• Application Number:
  US11/032,721
• Publication Number:
  US 20050260446A1
• Time in Patent Office: 1,394 Days
• Field of Search: None
• US Class Current: 428/690
• CPC Class Codes: C07F 15/002 Osmium compounds
• CPC Class Codes: C07F 15/0033 Iridium compounds
• CPC Class Codes: C07F 15/006 Palladium compounds
• CPC Class Codes: C07F 15/0073 Rhodium compounds
• CPC Class Codes: C07F 15/0086 Platinum compounds
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• 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 85/341 Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/346 comprising platinum
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

The present invention relates to organic light emitting devices (OLEDs), and more specifically to phosphorescent organic materials used in such devices. More specifically, the present invention relates to emissive phosphorescent material comprising a carbene ligand bound to a metal center, wherein the resulting metal-carbene complex is cationic.

Claims

1. An organic light emitting device, comprising:

an anode;

a cathode; and

an emissive region disposed between the anode and the cathode, wherein the emissive region comprises an emissive complex that comprises one or more carbene ligands coordinated to a metal center, wherein the complex is cationic, and an anion that provides charge balance.

2. The organic light emitting device of claim 1, wherein the metal center is selected from Re, Ru, Os, Rh, Ir, Pd, Pt, or Au.

3. The organic light emitting device of claim 2, wherein the emissive complex further comprises one or more carbon-metal bonds to the metal center wherein the further carbon-metal bonds are non-carbene-metal bonds.

4. The organic light emitting device of claim 3, wherein the one or more non-carbene carbon-metal bonds are phenyl-metal bonds.

5. The organic light emitting device of claim 2, wherein the device emits with a λ

_max less than about 500 nm.

6. The organic light emitting device of claim 5, wherein the device emits with a λ

_max less than about 450 nm.

7. The organic light emitting device of claim 2, wherein the device emits light having CIE coordinates wherein the X-coordinate is from about 0.10 to about 0.15, and the Y-coordinate in from about 0.10 to about 0.20.

8. The organic light emitting device of claim 2, wherein the complex has a structure selected from: