Highly efficient deep-blue phosphorescence from heptafluoropropyl-substituted iridium complexes. Issue 1 (14th November 2014)

• Record Type: Journal Article
• Authors: Kim, Jung-Bum; Han, Seung-Hoon; Yang, Kiyull; Kwon, Soon-Ki; Kim, Jang-Joo; Kim, Yun-Hi
• Is Part Of: Chemical communications. Volume 51:Issue 1(2015)
• Page Start: 58
• Page End: 61
• Publication Date: 2014-11-14
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c4cc07768g
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : (HFP)2 Ir(pic), (HFP)2 Ir(mpic), and (HFP)2 Ir(fptz) with electron-withdrawing heptafluoropropyl groups exhibited wide band gaps with high PL QYs and the devices showed the EQEs of 19.7%, 21.4% and 14.2% and CIE coordinates of (0.147, 0.164), (0.146, 0.165) and (0.152, 0.148), respectively. 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)2 Ir(mpic) exhibited a maximum EQE of 21.4% with a CIE of (0.146, 0.165).