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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 12
BKCSDE 31(12)
December 20, 2010 

Highly Efficient Red Phosphorescent OLEDs based on Ir(III) complexes with Fluorine-substituted Benzoylphenylpyridine Ligands
Hyun Ju Kang, Kum Hee Lee, Suk Jae Lee, Ji Hyun Seo, Young Kwan Kim*, Seung Soo Yoon*
Fluorine, Phosphorescent OLEDs, Ir(III) complex, 5-Benzoyl-2-phenylpyridine ligand
Four orange-red phosphorescent Ir(III) complexes were designed and synthesized based on the benzoylphenylpyridine ligand with a fluorine substituent. Multilayered OLEDs with the device structure, ITO/2-TNATA/NPB/CBP : 8% Ir(III) complexes/BCP/Liq/Al, were fabricated using these complexes as dopant materials. All the devices exhibited orange-red electroluminescence and their electroluminescent properties were quite sensitive to the structural features of the dopants in the emitting layers. Among these, the maximum luminance (14700 cd/m2 at 14.0 V) was observed in the device containing Ir(III) complex 1 as the dopant. In addition, its luminous, power and quantum efficiency were 11.7 cd/A, 3.88 lm/W and 9.58% at 20 mA/cm2, respectively. The peak wavelength of electroluminescence was 606 nm with CIE coordinates of (0.61, 0.38) at 12.0 V. The device also showed stable color chromaticity with various voltages.
3711 - 3717
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