| Functional organic polymer conductive polymers are the main force of organic electrochromic materials.During doping-de-doping,the polymers are accompanied by reversible changes in color.At the same time,it has many advantages such as low driving voltage,rich color change,short response time,high optical contrast,low cost,easy molecular design,and good processability.Therefore,polymer materials are rapidly developing in the field of electrochromism.Owing to polyheterocyclic compounds can be electrochemically polymerized,moreover,it is capable of undergoing doping and dedoping processes,thereby playing an important role in conductive polymers,and polythiophenes exhibit particularly promising properties in their conductivity and neutral state.Polymers and oligomers of thiophene derivatives have been extensively studied by electrochemical doping and dedoping.And there is sufficient evidence that thiophene oligomers generally have lower oxidation potentials,and each heterocycle participates in the doping and dedoping of the conjugated chain.Based on the display and optical storage characteristics of electrochromic devices,electrochromic materials have shown commercial prospects in many fields such as low-energy display devices and electronic paper,and can be used for updating and functional integration of various wearable electronic devices.In recent years,flexible electronic devices have become one of the fastest growing categories in electronics,and researchers are working to develop flexible,intelligent electronic devices that offer greater comfort and a wider range of applications.Electrochromic devices are currently available as an important functional component of flexible displays and some wearable electronic devices.1.Two new electrochromic monomers EPPE and EPMPE were synthesized through Stille coupling raection employing pyrido[4,3-b]pyrazine / methylpyrazine as acceptors and 3,4-ethylenedioxythiophene(EDOT)as donor.Two kinds of polymers were obtained by electrochemical deposition,and they were characterized and analyzed by electrochemical cyclic voltammetry,ultraviolet spectroscopy,fourier transform infrared spectroscopy and scanning electron microscopy.2.Design and synthesize BisEDOT as a donor unit,pyrido[3,4-b]pyrazine or pyrido[3,4-b]methylpyrazine as a receptor unit with strong electron-withdrawing ability.Then polymer precursor having a long conjugate is formed by a Stille coupling reaction.The solubility of the monomer in the solvent is decreased after the conjugated chain is grown,the process of electrochemical polymerization is more difficult.However,the color change of the polymer shows a relatively gray-black color,which is more suitable for electrochromic devices.3.The new electrochromic material 3-(4-fluorophenyl)thiophene(FPT)was found to be simple in synthesis and easy to electrochemically deposit.The PFPT film prepared by electrochemical method can change from red to light green under different redox states,it also has high coloring efficiency and high transmittance.The PFPT film exhibits excellent redox stability,electrochromic kinetic stability and optical memory.These advantages of PFPT films are expected to be used in the design of next-generation photovoltaic materials and can find applications in electrochemical sensors and organic electronic devices.In addition,PFPT materials can be further applied to high performance electrochromic polymers.4.Demonstrate an emerging poly(3-(4-fluorophenyl)thiophene)(PFPT)electrochromic application,excellent optical and mechanical properties.The PFPT-based electrochromic device exhibits a excellent electrochromic properties in terms of electrical activity,optical contrast,open optical memory effect and optical stability.Finally,we successfully assembled flexible patterned electrochromic devices with excellent mechanical flexibility and stability,and applied them to integrated electrochromic patterned matrix arrays,body surface electronic tattoos and infrared blocking smart window in the near infrared region. |
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