American Chemical Society
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Synthesis and Characterization of Novel Triarylamine Derivatives with Dimethylamino Substituents for Application in Optoelectronic Devices

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journal contribution
posted on 2019-03-29, 00:00 authored by Jung-Tsu Wu, Hsiang-Ting Lin, Guey-Sheng Liou
Two novel triphenylamine-based derivatives with dimethylamino substituents, N,N′-bis­(4-dimethylaminophenyl)-N,N′-bis­(4-methoxyphenyl)-1,4-phenylenediamine (NTPPA) and N,N′-bis­(4-dimethylaminophenyl)-N,N′-bis­(4-methoxyphenyl)-1,1′-biphenyl-4,4′-diamine (NTPB), were readily prepared for investigating the optical and electrochromic behaviors. These two obtained materials were introduced into electrochromic devices accompanied with heptyl viologen (HV), and the devices demonstrate a high average coloration efficiency of 287 cm2/C and electrochemical stability. Besides, NTPB/HV was further used to fabricate electrofluorochromic devices with a gel type electrolyte, and exhibit a controllable and high photoluminescence contrast ratio (Ioff/Ion) of 32.12 from strong emission to truly dark by tuning the applied potential in addition to a short switching time of 4.9 s and high reversibility of 99% after 500 cycles.