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Multi-colour electrochromic materials based on polyaromatic esters with low driving voltage

机译:基于多芳族酯的多色电致变色材料,具有低驱动电压

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Low-cost single molecular electrochromic (EC) materials with low toxicity are desirable for EC displays and photonic devices. In this study, new EC materials based on phthalates, an inexpensive class of benzoate materials with relatively simple molecular structure, are designed and prepared. Despite being good candidates for EC devices due to clear colour changes when reduced, devices fabricated using phthalate derivatives (PDs) suffer from a high driving voltage. Herein, we propose a facile strategy of replacing the benzene core with polyaromatic esters to enlarge the conjugated area and to synthesise PDs to lower the driving voltage in EC devices. Additionally, devices show good memory effect (hundreds of seconds), the ability to undergo multiple colour changes and enhanced stability, dependent on the size of the conjugated bridge between the two sides of the molecule. The fabricated EC devices based on polyaromatic esters demonstrate a low driving voltage (-2.6 V). We have shown that the number of aromatic ester rings in the conjugated area is very critical to obtain different colours in this new class of EC materials. This series of EC materials has promising potential for future industry applications due to the vivid colour change upon electrochemical stimulation at a low driving voltage.
机译:EC显示器和光子器件的低毒性低成本单分子电致变色(EC)材料是理想的。在这项研究中,设计并制备了基于邻苯二甲酸盐的新型EC材料,是具有相对简单的分子结构的苯甲酸酯材料。尽管由于在减少时由于清晰的颜色而导致EC器件是良好的候选者,但使用邻苯二甲酸酯衍生物(PDS)制造的装置遭受高驱动电压。在此,我们提出了一种容易策略,用于用多芳酯替换苯核来扩大共轭区域并合成PD以降低EC器件中的驱动电压。此外,设备显示出良好的记忆效果(数百秒),能够经历多种颜色的变化和增强的稳定性,取决于分子两侧之间的共轭桥的尺寸。基于多芳酯的制造的EC器件证明了低驱动电压(-2.6V)。我们已经表明,共轭区域中的芳香族环的数量非常关键,不能在这类新的EC材料中获得不同的颜色。由于在低驱动电压下电化学刺激时,这一系列EC材料具有未来的工业应用潜力。

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