Effect of different N, N-diphenylnaphthalen-2-amine units on the photo- and electro-luminescent properties of phenanthroimidazole derivatives. (October 2021)

• Record Type: Journal Article
• Authors: Wang, Ruidong; Wu, Shaoguang; Li, Yanmei; Yu, Tianzhi; Su, Wenming; Zhao, Yuling; Li, Yuanying; Yang, Hongyan
• Is Part Of: Dyes and pigments. Volume 194(2021)
• Publication Date: 2021-10
• Subjects: N, N-diphenylnaphthalen-2-amine -- Phenanthroimidazole derivative -- Photoluminescence -- Electroluminescence; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2021.109591
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Four new phenanthroimidazole/ N, N -diphenylnaphthalen-2-amine hybrid compounds, 6-(4-(1-(4-( tert -butyl)phenyl)-1 H -phenanthro[9, 10- d ]imidazole-2-yl)phenyl)- N, N -bis(4-methoxyphenyl)naphthalen-2-amine (PPI-NPA-OMe ), N, N -bis(4-( tert -butyl)phenyl)-6-(4-(1-(4-( tert -butyl) phenyl)-1 H -phenanthro[9, 10- d ]imidazole-2-yl)phenyl)naphthalen-2-amine (PPI-NPA-t-Bu ), 6-(4-(1-(4-( tert -butyl)phenyl)-1 H -phenanthro[9, 10- d ]imidazole-2-yl)phenyl)- N, N -di- p -tolylnaphthalen-2-amine (PPI-NPA-Me ) and 4, 4'-((6-(4-(1-(4-( tert -butyl)phenyl)-1 H -phenanthro[9, 10- d ] imidazole-2-yl)phenyl)naphthalen-2-yl)azanediyl)dibenzonitrile (PPI-NPA-CN ), were successfully synthesized for application in blue light emitting. The thermal stabilities, photophysical and electrochemical properties of the compounds were investigated. Furthermore, the vacuum-processed devices based on these compounds were fabricated, in which the device based on the compound PPI-NPA-OMe exhibited the best electroluminescence performance with a maximum brightness of 12, 593 cd/m 2, a maximum current efficiency of 9.23 cd/A and a maximum external quantum efficiency (EQE) of 4.92%. Graphical abstract: Image 1 Highlights: Four phenanthroimidazole/N, N-diphenylnaphthalen-2-amine hybrid compounds were synthesized for OLED applications. These compounds exhibited blue or deep-blue emission as well as good thermal stability. The device based PPI-NPA-OMe exhibited a brightness of 12593 cd/m 2 and luminous efficiency of 9.23 cd/A, and EQE of 4.92%.