Bipolar carbazole/quinoxaline-based host materials for efficient red PhOLEDs. (March 2018)

• Record Type: Journal Article
• Authors: Hu, Mingming; Xu, Qihao; Jiang, Yongxin; Mu, Haichuan; Gao, Lei; Hu, Peijun; Huang, Jinhai; Su, Jianhua
• Is Part Of: Dyes and pigments. Volume 150(2018)
• Page Start: 185
• Page End: 192
• Publication Date: 2018-03
• Subjects: Carbazole-quinoxaline -- Red PhOLEDs -- Bipolar hosts; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.08.040
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Three bipolar hosts, 9-(4-(2, 3-diphenylquinoxalin-6-yl)phenyl)-9 H -carbazole ( p -PQPC ), 9-(3-(2, 3-diphenylquinoxalin-6-yl)phenyl)-9 H -carbazole ( m -PQPC ) and 9-(2-(2, 3-diphenylquinoxalin-6-yl)phenyl)-9 H -carbazole ( o -PQPC ) were designed, synthesized and characterized for red phosphorescence organic light emitting devices (PhOLEDs). These three compounds exhibited excellent physical properties with high thermal stabilities, reasonable HOMO-LUMO energy levels and balanced charge transport. All of them were applied to fabricate red PhOLEDs as host materials, and the p -PQPC based device demonstrated outstanding electroluminescence performance with the maximum current efficiency, power efficiency and external quantum efficiency of 21.9 cd/A, 15.4 lm/W and 12.2%, respectively, which suggesting that p -PQPC is a promising host for red PhOLEDs. Graphical abstract: