title: 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. Multilayered 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/m2 at 10 V, a luminous efficiency of 17.47 cd/A, a power efficiency of 7.19 Im/W, an external quantum efficiency of 6.27% at 20 mA/cm2, respectively, and CIE(x,y) coordinates of (0.51, 0.48) at 10 V. Furthermore, a red OLED using dopant 2, with CIE(x,y) coordinates of (0.61, 0.39), exhibited a maximum luminance of 5797 cd/m2 at 10 V, a luminous efficiency of 11.43 cd/A at, a power efficiency of 4.12 Im/W, and an external quantum efficiency of 6.62% at 20 mA/cm2, respectively.
authors.affiliation: Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Republic of Korea.
authors.forename: Hyun Ju
authors.initials: HJ
authors.lastname: Kang
authors.forename: Kum Hee
authors.initials: KH
authors.lastname: Lee
authors.forename: Heo Mim
authors.initials: HM
authors.lastname: Kim
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Seo
authors.forename: Young Kwan
authors.initials: YK
authors.lastname: Kim
authors.forename: Seung Soo
authors.initials: SS
authors.lastname: Yoon