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A high Tg small-molecule arylamine derivative as a doped hole-injection/transport material for stable organic light-emitting diodes

Research paper by Xiao-Lan Huang, Jian-Hua Zou; Jun-Zhe Liu; Guang Jin; Jian-Bin Li; Sheng-Lin Yao; Jun-Biao Peng; Yong Cao; Xu-Hui Zhu

Indexed on: 27 Apr '18Published on: 16 Apr '18Published in: Organic Electronics



Abstract

Publication date: July 2018 Source:Organic Electronics, Volume 58 Author(s): Xiao-Lan Huang, Jian-Hua Zou, Jun-Zhe Liu, Guang Jin, Jian-Bin Li, Sheng-Lin Yao, Jun-Biao Peng, Yong Cao, Xu-Hui Zhu High performant hole-injection materials find important applications in organic electronics. In this contribution we report a simple small-molecule organic hole-injection/transport material N,N,N′,N′-tetra(4-methoxyphenyl)-[2,2′-binaphthalene]-6,6′-diamine for organic light-emitting diodes (OLEDs). It shows a high thermal and morphological stability with a T g of 99 °C. The ultraviolet photoelectron spectroscopy measurements reveal a favorable HOMO level of −5.05 eV p-Doping with tetrafluorotetracyanoquinodimethane (F4-TCNQ) increases the hole conductivity up to 2.64 × 10−4 S m−1 vs. 1.68 × 10−4 S m−1 of the neat film. The characterization of the red and green phosphorescent OLEDs suggests that introducing this thick p-doped hole-injection layer may yield high electroluminescent efficiency and operational stability. Moreover the new compound shows enhanced thermal and conducting properties and thus better performances in contrast with a conventional hole-injection material N,N,N′,N′-tetra(4-methoxyphenyl)-[1,10-biphenyl]-4,4′- diamine (MeO-TPD) in the OLEDs. Graphical abstract