Orange-Red Phosphorescent OLEDs Using Iridium(III) Complexes with Benzoylphenylpyridine Ligands Containing Fluorine and Trifluoromethyl Groups

Abstract

We have designed and synthesized four orange red phosphorescent Ir-III complexes based on the benzoylphenylpyridine ligand with fluorine and trifluoromethyl substitution. Multi layered OLEDs were fabricated using these complexes as dopant materials. Particularly, by using 1 as a dopant in the emitting layer, a highly efficient orange red OLED was fabricated, showing a maximum luminance of 10410 cd/m(2) at 10 V, a luminous efficiency of 17.47 cd/A, a power efficiency of 7.19 lm/W, an external quantum efficiency of 6.27% at 20 mA/cm(2), respectively, and CIEx,y coordinates of (0.51, 0.48) at 10 V. Furthermore, a red OLED using dopant 2, with CIEx,y coordinates of (0.61, 0.39), exhibited a maximum luminance of 5797 cd/m(2) at 10 V, a luminous efficiency of 11.43 cd/A at, a power efficiency of 4.12 lm/W, and an external quantum efficiency of 6.62% at 20 mA/cm(2), respectively.