Organometallic compounds and emission-shifting organic electrophosphorescence

• US 7,381,479 B2
• Filed: 05/03/2005
• Issued: 06/03/2008
• Est. Priority Date: 08/11/2000
• Status: Expired due to Term

• Current Assignee: The Trustees of Princeton University (Princeton University), Universal Display Corporation, University of Southern California
• Original Assignee: The Trustees of Princeton University (Princeton University), Universal Display Corporation, University of Southern California
• Inventors: Baldo, Marc A., Forrest, Stephen R., Lamansky, Sergey, Thompson, Mark E., Kwong, Raymond, Adachi, Chihaya, Adamovich, Vadim, Djurovich, Peter I.
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US11/122,160
• Publication Number:
  US 20050214576A1
• Time in Patent Office: 1,127 Days
• Field of Search: None
• US Class Current: 428/690
• CPC Class Codes: C07F 15/0033 Iridium compounds
• CPC Class Codes: C07F 15/0086 Platinum compounds
• 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 2211/1014 bridged by heteroatoms, e.g. N, P, Si or B
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1044 containing two 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: 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

Emissive phosphorescent organometallic compounds are described that produce improved electroluminescence, particularly in the blue region of the visible spectrum. Organic light emitting devices employing such emissive phosphorescent organometallic compounds are also described. Also described is an organic light emitting layer including a host material having a lowest triplet excited state having a decay rate of less than about 1 per second; a guest material dispersed in the host material, the guest material having a lowest triplet excited state having a radiative decay rate of greater than about 1×10⁵ or about 1×10⁶ per second and wherein the energy level of the lowest triplet excited state of the host material is lower than the energy level of the lowest triplet excited state of the guest material.

Claims

1. A compound having a chemical structure represented by a formula selected from the group consisting of

2. An organic light emitting device having an emissive layer comprising an organometallic compound, wherein the organometallic compound consists of

a metal having an atomic number of at least 72;

at least one mono-anionic, bidentate, carbon coordination ligand bound to the metal, and

at least one non mono-anionic, bidentate, carbon coordination ligand bound to the metal,

wherein the mono-anionic, bidentate, carbon coordination ligand has the structure

3. The organic light emitting device of claim 2, wherein R is halogen.

4. The organic light emitting device of claim 2, wherein R is alkyl.

5. The organic light emitting device of claim 2, wherein R is aryl.

6. The organic light emitting device of claim 2, wherein the metal is selected from the group consisting of Os, Ir, Pt and Au.

7. The organic light emitting device of claim 6, wherein the metal is selected from the group consisting of Ir and Pt.

8. The organic light emitting device of claim 2, wherein the non mono-anionic, bidentate, carbon coordination ligand is selected from the group consisting of

9. The organic light emitting device of claim 8, wherein the non mono-anionic, bidentate, carbon coordination ligand is selected from the group consisting of