Iridium Complex Containing Carbazole-Substituted Pyridine and Phenyl Derivatives as Main Ligand and Organic Light-Emitting Diodes Containing the Same

• US 20100270540A1
• Filed: 12/04/2008
• Published: 10/28/2010
• Est. Priority Date: 12/06/2007
• Status: Active Grant

• Current Assignee: Dong-A University, InkTec Company Limited
• Original Assignee: InkTec Company Limited
• Inventors: Lee, Jae Wook, Kim, Jung Hwan, Jin, Sung-Ho, Cho, Hyun Nam, Yoo, Ji Hoon, Chung, Kwang Choon
• Granted Patent: US 8,232,549 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/185 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 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/342 comprising iridium

Abstract

The present invention relates to a novel iridium complex into which carbazole-substituted pyridine derivatives and various substituents-substituted phenyl derivatives are introduced as main ligand and a electrophosphorescence diode containing the same as a dopant of a light-emitting layer. When the iridium complex according to the present invention is applied to an organic light-emitting diode, the heat-resistance property and the light-emitting property can be significantly improved as well as the light-emitting efficiency and the like can be significantly improved by doping the iridium complex compound into the light-emitting layer as compared to the conventional organic light-emitting diode.

Claims

1. An iridium complex represented by Chemical Formula (1):

2. An iridium complex according to claim 1, wherein the ligand L is selected from following structures:

3. An iridium complex according to claim 2, wherein the ligand L is selected from following structures:

4. An iridium complex according to claim 3, wherein R₁ to R₈ independently represent hydrogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclopropylmethyl, or cyclobutylmethyl;

X₁ represents hydrogen, fluoro (F), cloro (Cl), cyano, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, t-butyl, methoxy, ethoxy, n-propoxy, t-butoxy, trifluoromethyl, trimethylsilyl, triphenylsilyl, cyclopropyl, cyclobutyl, cyclohexyl, phenyl, naphthyl, anthryl, aminomethyl, aminoethyl, or aminobutyl;

m is an integer 1 or 2.

5. An iridium complex according to claim 4, wherein the iridium complex is selected from the following compounds:

6. An organic light-emitting diode containing an iridium complex according to any one of claims 1 to 5.

7. An organic light-emitting diode according to claim 6, wherein organic light-emitting diode includes:

a first electrode;

a light-emitting layer including the iridium complex; and

a second electrode.

8. An organic light-emitting diode according to claim 7, wherein the organic light-emitting diode includes a buffer layer between the first electrode and the light-emitting layer and includes an electron transfer layer and an electron injection layer between the light-emitting layer and the second electrode.

9. An organic light-emitting diodes according to claim 8, wherein the buffer layer includes a hole injection layer and a hole transfer layer.

10. An organic light-emitting diode according to claim 6, wherein the iridium complex is used as a dopant of a light-emitting layer.