US 7,320,834 B2
Organic light emitting diode containing a novel Ir complex as a phosphorescent emitter
Chien-Hong Cheng, Hsinchu (Taiwan); Jiun-Pey Duan, Hsinchu (Taiwan); Dinesh Kumar Rayabarapu, Hsinchu (Taiwan); and Betty Marie Jennifer. S. P., Hsinchu (Taiwan)
Assigned to National Tsing Hua University, Hsinchu (Taiwan)
Filed on Apr. 13, 2004, as Appl. No. 10/822,647.
Claims priority of application No. 92120288 A (TW), filed on Jul. 24, 2003.
Prior Publication US 2005/0227109 A1, Oct. 13, 2005
Int. Cl. H01L 51/54 (2006.01); C09K 11/06 (2006.01)
U.S. Cl. 428—690  [428/917; 313/504; 313/506; 257/E51.044] 27 Claims
 
1. An organic light emitting diode (OLED) comprising: an anode on a substrate, an electroluminescent medium on said anode, and a cathode on said electroluminescent medium, characterized in that said electroluminescent medium comprises a light emitting layer comprising a phosphorescent Ir complex having the following structures (I) or (II):

OG Complex Work Unit Drawing
wherein X is an arbitrary monoanionic bidentate ligand;
Z is an arbitrary atomic moiety capable of forming a nitrogen-containing heterocyclic group;
R1 is selected from the group consisting of H, halogen, C1-C6 alkyl, halogen-substituted C1-C6 alkyl, C1-C6 alkoxy, phenyl C1-C6 alkyl, amino, and aryl;
m is 0 or any positive integer determined by the ring size of said nitrogen-containing heterocyclic group;
R2 is selected from the group consisting of H, halogen, C1-C6alkyl, halogen-substituted C1-C6alkyl, C1-C6alkoxy, phenyl C1-C6alkyl, amino, aryl, and heterocyclic aryl; and
R3 is aryl or heterocyclic aryl;
and provided that said nitrogen-containing heterocyclic group containing said Z moiety is not pyridine, quinoline or isoquinoline.