Indole-linked triazine-dibenzothiophene/dibenzofuran based host materials for high-efficiency green and red phosphorescent organic light-emitting diodes. (February 2020)

• Record Type: Journal Article
• Authors: Wang, Huan; Zhang, Yiyao; Song, Wenxuan; Huang, Jinhai; Xia, Zhenyuan; Su, Jianhua
• Is Part Of: Dyes and pigments. Volume 173(2020)
• Publication Date: 2020-02
• Subjects: Dibenzofuran -- Dibenzothiophene -- Triazine -- Host materials -- Green and red PhOLEDs; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.09.077
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Two host heterocyclic compounds 5-(dibenzo[b, d]furan-4-yl)-1-(4, 6-diphenyl-1, 3, 5-triazin-2-yl)-1H-indole (FITRZ ) and 5-(dibenzo[b, d]thiophen-4-yl)-1-(4, 6-diphenyl-1, 3, 5-triazin-2-yl)-1H-indole (TITRZ ) were synthesized by CN coupling reaction of triazine and dibenzothiophene/dibenzofuran moiety with a 1, 5-bridged indole unit. Their photo-physical, thermal and electrochemical properties were fully explored, and the results indicate that both of them are promising phosphorescent host materials for green and red PhOLED devices with low on-set potentials. For example, the green PHOLED based on TITRZ showed the maximum current and external quantum efficiency up to 85.9 cd/A and 23.7%. Meanwhile, the red PhOLED based on FITRZ yielded the maximum current and external quantum efficiency of 41.3 cd/A and 18.8% with a turn-on voltage of 3.0 V. Graphical abstract: Image 1 Highlights: Noble host materials for green and red PhOLED devices with low on-set potentials. Green PHOLED based on TITRZ with EQE up to 23.7%. Red PhOLED based on FITRZ yielded EQE of 18.8% with a turn-on voltage of 3.0 V.