基于DPP聚合物电致变色材料的合成及其器件性能研究

发布时间：2018-04-21 10:31

  本文选题：电致变色 + 给体-受体结构　； 参考：《太原理工大学》2017年硕士论文

【摘要】：有机电致变色聚合物材料具有原料来源丰富、器件响应速度快、对比度大、易于加工、成本低廉等诸多优点,自上世纪70年代被科学家发现以来,发展十分迅速,成为未来电致变色材料一个重要的发展方向。作为变色材料,颜色的丰富程度在很大程度上决定了其在实际应中的前景。传统的聚合物电致变色材料通常只具备单一的吸收峰,限制了其在显示领域的应用。而具有给体-受体结构的聚合物通常有双吸收峰,可以得到三原色之一的绿色,拓宽了材料的色域和在显示领域的应用。因此,给体-受体结构的导电聚合物逐渐被应用到了有机电致变色领域中。本文以DPP材料为基本原料,合成了具有给体-受体结构的聚合物,研究了其电致变色性质,并对其变色机理进行了研究,主要研究内容如下:1、以DPP为基本原料,通过选取合适的给体、受体单元,合成了两类具有给体-受体结构的聚合物材料:PDPP-Ph-NT和PDPP-BDT-NT。对于PDPP-Ph-NT类材料,当给受体配比为2:1的时,变色效果最好,吸收峰位于730 nm,热分解温度为377℃,HOMO和LUMO能级分别为-5.18 eV与-3.75 eV;对于PDPP-BDT-NT类材料,合成了三种给受体比例分别4:1,1:1和1:4的材料,三种材料的热分解温度基本都在370℃左右,随着给受体配比的提高,吸收峰发生红移。三种材料的HOMO和LUMO能级分布分别为-5.6 eV与-4.1 eV(4:1),-5.69 eV与-4.2 eV(1:1),-5.78 eV与-4.39 eV(1:4)。2、研究了PDPP-Ph-NT和PDPP-BDT-NT的电致变色性能,发现PDPPPh-NT的响应速度更快且在相同偏压下吸收光谱的改变更显著;同时通过调整PDPP-BDT-NT中给体和受体的比例,发现含有较多给体单元的材料更易在外加电场下发生电子的转移,具有更好的电致变色性质。以上结果表明给体和受体单元会对材料的电致变色性质产生影响。为了进一步说明给体、受体单元对材料电致变色性质的影响,本文通过密度泛函理论模拟,计算了PDPP-Ph-NT和PDPP-BDT-NT在HOMO和LUMO的电子云分布,从理论上对给体受体单元在电致变色过程中的影响给出了解释,并设计了在PDPP-Ph-NT中掺杂受体材料(1,4-二溴-2,5-二氟苯)的实验,发现PDPPPH-NT的电致变色性能下降,从实验上进行了验证。通过以上实验和理论分析,发现在具备给体-受体结构的DPP类导电聚合物中,给体单元和受体单元之间的相互作用强度会影响材料的变色性质。当聚合物被施加偏压时,给受体之间相互作用弱的材料更容易失去电子,电致变色的性质更好。基于此,可以得出,可通过调整给受体单元的给电子和吸电子能力来调整它们之间的相互作用强度,进而调控材料的电致变色性质。
[Abstract]:Organic electrochromic polymer materials have many advantages, such as abundant raw materials, fast response speed, high contrast, easy processing, low cost and so on. Since they were discovered by scientists in the 1970s, organic electrochromic polymer materials have developed rapidly. It has become an important development direction of electrochromic materials in the future. As a discoloration material, the richness of color determines its prospect in practice to a great extent. Traditional polymer electrochromic materials usually have a single absorption peak, which limits their application in display field. However, polymers with donor-acceptor structure usually have double absorption peaks, which can produce green of one of the three primary colors, which broadens the color gamut of materials and their applications in display field. Therefore, donor-acceptor conductive polymers have been gradually applied to the field of organic electrochromic. In this paper, the polymer with donor-acceptor structure was synthesized from DPP material. The electrochromic properties of the polymer were studied, and the mechanism of its discoloration was studied. The main research contents are as follows: 1. Using DPP as the basic raw material. Two kinds of polymer materials with donor-receptor structure:: PDPP-Ph-NT and PDPP-BDT-NTwere synthesized by selecting suitable donors and receptor units. For PDPP-Ph-NT materials, when the ratio of acceptor is 2:1, the chromotropic effect is the best, the absorption peak is at 730 nm, the thermal decomposition temperature is 377 鈩，

本文编号：1782049