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임보규,한송이,정서현,정유진,박종목,이원주,심희상,나윤채 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Carbazoles are excellent chromophores for electrochromic (EC) applications owing to their exceptionaloxidation properties. Herein, we synthesized a donor-acceptor-type small molecule semiconductor,named LGC-D023, containing carbazole as a core donor, diketopyrrolopyrrole as a weak-acceptorp-linker, and 3-octylrhodanine as an electron-acceptor end-unit; and characterized its optical, thermal,and EC properties. LGC-D023 exhibited good organic solvent solubility, as well as distinct melting andcrystallization transitions above 200 C. Spectroelectrochemical spectra showed blue (L*: 88.28, a*:6.56, b*:1.29)-to-red (L*: 93.61, a*: 2.94, b*:0.75) color switching with a high optical contrast(35.3%), fast response time (>0.3 s), and desirable coloration efficiency (91.9 cm2/C). These resultsconfirmed that this donor-acceptor small molecule could be a new promising candidate for an ECmaterial.