Stable and efficient electroluminescent materials

• US 7,851,072 B2
• Filed: 05/19/2006
• Issued: 12/14/2010
• Est. Priority Date: 05/19/2005
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Knowles, David, Ma, Bin, Kwong, Raymond, Ceyrolles, William
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US11/438,120
• Publication Number:
  US 20070003789A1
• Time in Patent Office: 1,670 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 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• 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 85/342 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 may include a molecule of Formula I wherein an alkyl substituent at position R′₅ results in high efficiency and operational stability in the organic light emitting device. Additionally or alternatively, the emissive layer may include a metal-ligand complex in which the ligand is an aryl or alkyl substituted phenylpyridine ligand.

Claims

1. A compound having the formula:

2. The compound of claim 1, wherein m=3.

3. The compound of claim 2, wherein the compound has the formula:

4. The compound of claim 1, wherein R′

₄ is selected from methyl, ethyl, n-butyl, n-propyl, and t-butyl, and wherein R′

₃ is an alkyl independently selected from methyl, ethyl, n-butyl, n-propyl, and t-butyl.

5. An organic light-emitting device comprising

an anode;

a cathode; and

an emissive layer disposed between the anode and the cathode, wherein the emissive layer comprises a compound of claim 1.

6. The device of claim 5, wherein m=3.

7. The device of claim 6, wherein the compound has the formula:

8. The device of claim 5, wherein R′

₄ is selected from methyl, ethyl, n-butyl, n-propyl, and t-butyl, and wherein R′

₃ is an alkyl independently selected from methyl, ethyl, n-butyl, n-propyl, and t-butyl.

9. The compound of claim 1, wherein R′

₄ is selected from methyl, ethyl, n-butyl, n-propyl, and t-butyl.

10. The compound of claim 9, wherein R₃, R₄, and R₆ are all H.

11. The compound of claim 1, wherein R′

₅ is H.