- 标题
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- 实验方案
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Electrochemical and optical characterization of a multielectrochromic copolymer based on 3,4-ethylenedioxythiophene and functionalized dithienylpyrrole derivative
摘要： A novel conjugated copolymer, namely poly(3,4-ethylenedioxythiophene-co-1-(3,5-bis(trifluoromethyl)phenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole) (P(EDOT-co-1)) was synthesized via electropolymerization method from a mixture of 3,4-ethylenedioxythiophene and 1-(3,5-bis(trifluoromethyl)phenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole comonomers. The corresponding copolymer has an optical band gap of 1.7 eV and 41% optical contrast at 525 nm with a coloration efficiency of 258 cm2/C and 1.4 s switching time. The copolymer has a multi-electrochromic behavior: It has dark purple, purple, gray, green and cyan colors at different oxidation states. Electrochemical stability of P(EDOT-co-1) copolymer was also investigated and it was observed that the copolymer retained 86% of its stability under ambient conditions in the presence of oxygen (without purging the electrolyte solution with any inert gas) according to the current density and 83% according to the deposited charge even after 1000 redox cycles.
关键词： Copolymerization,SNS,3,4-Ethylenedioxythiophene,EDOT,Multielectrochromism, dithienylpyrrole,Electropolymerization,1,4-di(thiophen-2-yl)butane-1,4-dione,3,5-bis(trifluoromethyl)benzenamine
更新于2025-09-23 15:21:01
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Saturated red phosphorescent Iridium(III) complexes containing phenylquinoline ligands for efficient organic light-emitting diodes
摘要： Saturated red iridium phosphors are strongly desired for application in organic light-emitting diodes (OLEDs). Most of the reported iridium complexes with 2-arylquinoline or its derivatives as cyclometalating ligands are orange-red phosphorescent with peak wavelength below 620 nm. Herein trifluoromethyl (CF3) or Fluorine (F) is introduced into the 6-site of quinoline ring to design and synthesize the cyclometalated ligands 2-phenyl-6-CF3/F-quinoline (CF3-phq or F-phq) and heteroleptic iridium complexes Ir(CF3-phq)2(acac) (Ir-1), Ir(CF3-phq)2(tmd) (Ir-2), Ir(F-phq)2(acac) (Ir-3) and Ir(F-phq)2(tmd) (Ir-4). Owing to the electron-deficient feature of CF3 and F, the electron affinity of these complexes are increased, the corresponding LUMOs are pulled downwards, and the phosphorescence of CF3-containing iridium complexes are saturated red with peaks at 627–632 nm in photoluminescence. At the same time, by varying the ancillary ligand from acetylacetonate (acac) to 2,2,6,6-tetrametylheptane-3,5-dionate (tmd), the emitting performance are dramatically improved. As a result, the Ir(CF3-phq)2(tmd) based red OLED realized pure red electroluminescence with Commision Internationale de L’Eclairage (CIE) coordinates of (0.67, 0.33) with a high brightness of 12695 cd m?2 and a maximum external quantum efficiency of 14.96%, respectively, which maintained as high as 9.62% at a practical luminance of 1000 cd m?2. This is the first example of saturated red iridium phosphors with structure modification at the 6-site of quinoline ring of 2-phenylquinoline ligand.
关键词： Iridium complex,Phosphorescent organic light emitting diodes (PhOLEDs),Saturated red,2-Phenylquinoline,Trifluoromethyl
更新于2025-09-23 15:19:57
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A Trifluoromethyl Group Modified Non-fullerene Acceptor Towards Improved Power Conversion Efficiency Over 13% in Polymer Solar Cells
摘要： Herein, we report a new molecule structure modification strategy for non-fullerene small molecule electron acceptors (NFAs) for solar cells through trifluoromethylation of end-capping groups. The synthesized trifluoromethylated acceptor ITCF3 exhibits narrower band gap, stronger light absorption, lower molecular energy levels and better electron transport property comparing to the reference NFA without trifluoromethyl group (ITIC). Bulk heterojunction solar cells based on ITCF3 combined with PM6 polymer donor exhibit a significantly improved power conversion efficiency of 13.3% comparing with ITIC-based device (8.4%). This work reveals great potential of trifluoromethylation in design of efficient photovoltaic acceptor materials.
关键词： power conversion efficiency,non-fullerene acceptor,trifluoromethyl group,organic solar cell,polymer
更新于2025-09-23 15:19:57
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Effect of multiple electron-withdrawing substituents on photovoltaic properties of quinoxaline-based polymers
摘要： Two quinoxaline-based polymers, in which the electron-donating 2-octyldodecyl modified benzodithiophene (BDT) group was connected to the electron-accepting 2,3-diphenyl quinoxaline (Qx) through a thiophene bridge, were synthesized by the Stille coupling reaction. The strong electron-withdrawing trifluoromethyl (CF3) substituents were introduced at para-position of the benzene ring at 2,3-positions Qx to yield PBDT-CF3Qx. Moreover, two fluorine atoms were incorporated at the 6,7-positions of Qx in PBDT-CF3Qx to produce PBDT-CF3QxF. This simple approach demonstrate the effect of multiple electron-withdrawing moieties on the optical, electrochemical, and photovoltaic properties of Qx-based polymers.
关键词： quionoxaline,trifluoromethyl,fluorine,electron-withdrawing
更新于2025-09-19 17:13:59
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Enhanced photovoltaic performance of quinoxaline-based small molecules through incorporating trifluoromethyl substituents
摘要： Two D-A-D type quinoxaline-based small molecules have been synthesized by Suzuki coupling reaction for solution-processable organic photovoltaic cells (OPVs). The electron-donating triphenyl-amine was connected to both ends of an electron-withdrawing 2,3-diphenylquinoxaline core through thiophene bridge to produce QxTPA. In addition, QxCF3TPA was formed by introducing strong electron-withdrawing trifluoromethyl (CF3) groups into the para-position of the phenyl ring at the 2,3-position of quinoxaline core in QxTPA to explore their effect on the various properties of small molecules. The finding revealed the significant contributions of CF3 substituents in enhancing the photovoltaic performances of OPVs with QxCF3TPA compared to the reference case with QxTPA.
关键词： Small molecules,triphenylamine,trifluoromethyl,organic photovoltaic cell,2,3-diphenylquinoxaline
更新于2025-09-19 17:13:59