title: Highly efficient deep-blue phosphorescence from heptafluoropropyl-substituted iridium complexes.
abstract: New deep-blue iridium complexes, consisting of a heptafluoropropyl (HFP) substituent at the 3' position of 2',4''-difluorophenyl, have a deep HOMO level and decreased shoulder electronic transition and inhibit self-quenching due to the sterically hindered group without conjugation. An OLED using (HFP)2Ir(mpic) exhibited a maximum EQE of 21.4% with a CIE of (0.146, 0.165).
authors.affiliation: Department of Materials Science and Engineering and the Center for Organic Light Emitting Diodes, Seoul National University, Seoul 151-742, South Korea. jjkim@snu.ac.kr.
authors.forename: Jung-Bum
authors.initials: JB
authors.lastname: Kim
authors.forename: Seung-Hoon
authors.initials: SH
authors.lastname: Han
authors.forename: Kiyull
authors.initials: K
authors.lastname: Yang
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon
authors.forename: Jang-Joo
authors.initials: JJ
authors.lastname: Kim
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim