A novel high-PL-efficiency Ir complex in organic light emitting diodes

Xiuru Wang; Haoyu Chen; Wenqing Zhu; Runguang Sun; G. H. Ding; He Tian

doi:10.1117/12.573202

31 January 2005 A novel high-PL-efficiency Ir complex in organic light emitting diodes

Xiuru Wang, Haoyu Chen, Wenqing Zhu, Runguang Sun, G. H. Ding, He Tian

Proceedings Volume 5624, Semiconductor and Organic Optoelectronic Materials and Devices; (2005) https://doi.org/10.1117/12.573202
Event: Asia-Pacific Optical Communications, 2004, Beijing, China

Abstract

Organic light emitting diodes (OLED) employing an Ir complex with coumarin (C6) and acetylacetone (acac) ligands Ir(C6)₂(acac) are studied. This novel Ir complex can be used both as electron transporting material and light emitting dopant. From a calculation, the PL quantum efficiency of Ir(C6)₂(acac) in dilute chloroform solution is 70%. With a device structure of ITO (indium tin oxide)/T-NATA(4,4’,4"-tris(N-(2-Naphthyl)-N-phenyl-amino)triphenylamine)(40nm)/NPB(N,N’-bis(1-naphthyl)-N,N’-diphenyl-1,1’-biphenyl-4,4’diamine)(40nm)/Alq₃(tris-(8-hydroxy-quinoline)aluminum):Ir(C6)₂(acac)(1%)(40nm)/Alq₃(tris-(8-hydroxy-quinoline)aluminum)(40nm)/LiF(Lithium fluoride)(1nm)/Al (120nm), a green color (CIE coordinates x=0.22; y=0.65) and a max luminance of 33792 cd/m² and an efficiency of 12cd/A are obtained. The solid film of Ir(C6)₂(acac) excited at 400 nm shows a strong orange PL emission with a peak at 562 nm. This means When C6 is coordinated with Ir metal; the concentration quench is significantly prevented. As a result, even J is high to 200mA/cm², the device with a structure of ITO/T-NATA/NPB/Alq₃:Ir (C6)₂(acac)(1%)/Alq₃ (40nm)/ LiF/Al can maintain the high efficiency (11.9cd/A) and the high luminance (23683 cd/m²).

Citation Download Citation

Xiuru Wang, Haoyu Chen, Wenqing Zhu, Runguang Sun, G. H. Ding, and He Tian "A novel high-PL-efficiency Ir complex in organic light emitting diodes", Proc. SPIE 5624, Semiconductor and Organic Optoelectronic Materials and Devices, (31 January 2005); https://doi.org/10.1117/12.573202

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