本文選題：電致變色 + 給體-受體結(jié)構(gòu)��； 參考：《太原理工大學》2017年碩士論文

【摘要】：有機電致變色聚合物材料具有原料來源豐富、器件響應速度快、對比度大、易于加工、成本低廉等諸多優(yōu)點,自上世紀70年代被科學家發(fā)現(xiàn)以來,發(fā)展十分迅速,成為未來電致變色材料一個重要的發(fā)展方向。作為變色材料,顏色的豐富程度在很大程度上決定了其在實際應中的前景。傳統(tǒng)的聚合物電致變色材料通常只具備單一的吸收峰,限制了其在顯示領(lǐng)域的應用。而具有給體-受體結(jié)構(gòu)的聚合物通常有雙吸收峰,可以得到三原色之一的綠色,拓寬了材料的色域和在顯示領(lǐng)域的應用。因此,給體-受體結(jié)構(gòu)的導電聚合物逐漸被應用到了有機電致變色領(lǐng)域中。本文以DPP材料為基本原料,合成了具有給體-受體結(jié)構(gòu)的聚合物,研究了其電致變色性質(zhì),并對其變色機理進行了研究,主要研究內(nèi)容如下:1、以DPP為基本原料,通過選取合適的給體、受體單元,合成了兩類具有給體-受體結(jié)構(gòu)的聚合物材料:PDPP-Ph-NT和PDPP-BDT-NT。對于PDPP-Ph-NT類材料,當給受體配比為2:1的時,變色效果最好,吸收峰位于730 nm,熱分解溫度為377℃,HOMO和LUMO能級分別為-5.18 eV與-3.75 eV;對于PDPP-BDT-NT類材料,合成了三種給受體比例分別4:1,1:1和1:4的材料,三種材料的熱分解溫度基本都在370℃左右,隨著給受體配比的提高,吸收峰發(fā)生紅移。三種材料的HOMO和LUMO能級分布分別為-5.6 eV與-4.1 eV(4:1),-5.69 eV與-4.2 eV(1:1),-5.78 eV與-4.39 eV(1:4)。2、研究了PDPP-Ph-NT和PDPP-BDT-NT的電致變色性能,發(fā)現(xiàn)PDPPPh-NT的響應速度更快且在相同偏壓下吸收光譜的改變更顯著;同時通過調(diào)整PDPP-BDT-NT中給體和受體的比例,發(fā)現(xiàn)含有較多給體單元的材料更易在外加電場下發(fā)生電子的轉(zhuǎn)移,具有更好的電致變色性質(zhì)。以上結(jié)果表明給體和受體單元會對材料的電致變色性質(zhì)產(chǎn)生影響。為了進一步說明給體、受體單元對材料電致變色性質(zhì)的影響,本文通過密度泛函理論模擬,計算了PDPP-Ph-NT和PDPP-BDT-NT在HOMO和LUMO的電子云分布,從理論上對給體受體單元在電致變色過程中的影響給出了解釋,并設計了在PDPP-Ph-NT中摻雜受體材料(1,4-二溴-2,5-二氟苯)的實驗,發(fā)現(xiàn)PDPPPH-NT的電致變色性能下降,從實驗上進行了驗證。通過以上實驗和理論分析,發(fā)現(xiàn)在具備給體-受體結(jié)構(gòu)的DPP類導電聚合物中,給體單元和受體單元之間的相互作用強度會影響材料的變色性質(zhì)。當聚合物被施加偏壓時,給受體之間相互作用弱的材料更容易失去電子,電致變色的性質(zhì)更好�；诖�,可以得出,可通過調(diào)整給受體單元的給電子和吸電子能力來調(diào)整它們之間的相互作用強度,進而調(diào)控材料的電致變色性質(zhì)。
[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，

本文編號：1782049