Abstract
Two novel conjugated polymers based on a donor–acceptor–donor′ (D–A–D′) asymmetric structure, using fluorenone as the acceptor unit linked with different donor units on both sides, were designed and synthesized, namely poly2-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-7-(thiophen-2-yl)-9H-fluoren-9-one (PSWE) and poly2-(4-(diphenylamino)phenyl)-7-(thiophen-2-yl)-9H-fluoren-9-one (PSWT). Compared with the symmetrical structure polymer poly(2,7-dithiophen-2-yl)-fluoren-9-one (PSWS), the asymmetric structure polymers exhibit lower redox potentials and bandgap values and more redox peaks and thus showed a richer variety of colors. Moreover, the introduction of 3,4-ethylenedioxythiophene improved PSWE’s response speed under the near-infrared–visible band and enhanced its optical contrast in the near-ultraviolet spectrum. The introduction of triphenylamine improved PSWT’s optical contrast in the near-infrared and visible spectra. It could be inferred that the polymers with asymmetric structure (D–A–D′) exhibit m...
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