Highly efficient orange phosphorescent organic light-emitting diodes with (4-(3, 5-dimethylphenyl)-2-(m-tolyl)pyridine)-based iridium complex. (February 2021)

• Record Type: Journal Article
• Authors: Cheon, Hyung Jin; Joo, Chul Woong; Lee, Da Yeon; Huseynova, Gunel; Lee, Jae-Hyun; Lee, Jonghee; Kim, Yun-Hi
• Is Part Of: Dyes and pigments. Volume 186(2021)
• Publication Date: 2021-02
• Subjects: Organic light-emitting diodes -- Orange emitter -- Phosphorescent -- External quantum efficiency -- Iridium complex; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2020.109006
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A new (4-(3, 5-dimethylphenyl)-2-(m-tolyl)pyridine)-based iridium complex was synthesized for highly efficient orange phosphorescent organic light-emitting diodes (PhOLEDs). The effect of introduction of a methyl substituent into the 4-position of the phenyl ring in a phenylpyridine chelating ligand was studied. The PhOLEDs based on this newly-synthesized iridium complex exhibited maximum external quantum and current efficiencies of 20.33% and 61.16 cd/A, respectively. These respective values maintained over 15% and 48 cd/A even at a very high luminance of 15000 cd/m 2 with Commission Internationale de l'Eclairage coordinates of (0.49, 0.51). Graphical abstract: In this work, a new (4-(3, 5-dimethylphenyl)-2-(m-tolyl)pyridine)-based iridium complex (Ir(dmpmpy)2 (acac)) was synthesized for highly efficient orange phosphorescent organic light-emitting diodes (PhOLEDs). The effect of introduction of a methyl substituent into the 4-position of the phenyl ring in a phenylpyridine chelating ligand was studied. The PhOLEDs based on this newly-synthesized iridium complex exhibited maximum external quantum and current efficiencies of 20.33% and 61.16 cd/A, respectively. These respective values maintained over 15% and 48 cd/A even at a very high luminance of 15000 cd/m2 with Commission Internationale de l'Eclairage color coordinates of (0.49, 0.51). Image 1 Highlights: A new orange emission iridium complex was synthesized. Methyl substituent introduced at phenyl pyridine chelating ligand. The maximum EQE of 20.33% and CE of 61.16 cd/A are achieved. The EQE and CE maintained over 15% and 48 cd/A at 15, 000 cd/m 2 .