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  本文關(guān)鍵詞： 聚合物發(fā)光顯示器 噴墨打印技術(shù) 超疏水界面 分子自組裝　出處：《華南理工大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：有機電致發(fā)光顯示器(Organic Light-emitting Diode Display,OLED Display)因具有低能耗、寬視角、高開關(guān)速率和高對比度等特點而顯示出巨大的應(yīng)用潛力。聚合物發(fā)光顯示器(Polymer Light-emitting Diode Display,PLED Display)因其材料發(fā)光顏色在全可見光區(qū)內(nèi)可調(diào)、可溶液簡單加工及適用于柔性大面積器件的生產(chǎn)而吸引了更多的目光。旋涂法無疑是最簡便快捷并且成膜質(zhì)量好的溶液加工方式,但一般只能用于單色顯示屏制備,不能進行不同顏色的聚合物薄膜的圖案化來實現(xiàn)全彩顯示,而且材料浪費大。在聚合物發(fā)光薄膜圖案化技術(shù)中,噴墨打印因為具有加工過程簡單高效、材料利用率高、適用于溶液加工、適用于柔性襯底、易于卷對卷工藝的整合和自動化等優(yōu)點,被認(rèn)為是最具有應(yīng)用潛力的技術(shù)。高質(zhì)量聚合物薄膜的制備是PLED器件制作的關(guān)鍵,但噴墨打印液滴在干燥過程中通常伴隨著“咖啡環(huán)”現(xiàn)象,造成薄膜不均勻沉積。我們以聚芴藍(lán)光材料PFSO為研究對象,系統(tǒng)地研究了溶劑類型、墨水濃度、基底溫度、打印參數(shù)等因素對其成膜形貌的影響。實驗表明,這些影響因素都能間接地影響液滴三相接觸線的釘扎時間和釘扎后形成的毛細(xì)流動強弱,從而影響液滴的干燥形貌。延遲或者抑制接觸線的釘扎有利于點狀薄膜的形成。而在接觸線釘扎后,可以通過減弱由于溶劑揮發(fā)不均勻而形成的毛細(xì)流動,使得溶劑蒸發(fā)速率與溶質(zhì)的遷移速率相平衡,實現(xiàn)溶質(zhì)的均勻沉積。我們通過對溶劑和濃度的系統(tǒng)調(diào)控,成功地利用單溶劑墨水在室溫條件的無處理基板上打印出邊界清晰、表面均勻的薄膜。在噴墨打印制備PLED顯示屏過程中,如何配制可打印的墨水得到穩(wěn)定的液滴,如何實現(xiàn)液滴的精確定位,如何調(diào)控薄膜成膜質(zhì)量和分辨率以及如何優(yōu)化器件結(jié)構(gòu),都是制備高性能顯示屏?xí)r需要考慮的重要因素。我們通過調(diào)整打印參數(shù)和打印方式來調(diào)控液滴打印穩(wěn)定性、尺寸大小以及精確定位,實現(xiàn)打印液滴在對應(yīng)高分辨率的像素內(nèi)均勻沉積而無溢出。此外,我們設(shè)計了新型的線型像素結(jié)構(gòu)基板,成功簡化了操作工藝,同時提高了像素內(nèi)薄膜的均勻性;最后通過進一步優(yōu)化緩沖層(Buffer Layer)厚度和發(fā)光層的厚度,實現(xiàn)了打印器件效率達到對比器件(對應(yīng)旋涂器件)效率的75%。在解決一系列工藝問題后,我們成功打印出無缺陷的3英寸、120ppi的聚合物藍(lán)光顯示屏。固體表面的浸潤性對溶液加工薄膜的均勻性和打印分辨率有一定的影響,是全溶液加工技術(shù)面臨的一項重要科學(xué)問題。通過對固體表面結(jié)構(gòu)及液體行為的研究,調(diào)控固體表面的浸潤性,對實驗研究和實際應(yīng)用都有著重要的意義。特別地,超疏水作為浸潤性的一個極端現(xiàn)象,有著廣泛的應(yīng)用前景。我們利用全溶液加工的方法,制備了獨立自支撐、柔性、透明、具有熒光發(fā)射特性的有機超疏水復(fù)合薄膜。其中,通過有機化合物1的分子自組裝得到的分等級微/納結(jié)構(gòu)實現(xiàn)了薄膜的表面液體浸潤狀態(tài)由Wenzel態(tài)向Cassia態(tài)的轉(zhuǎn)變。制備的復(fù)合薄膜表現(xiàn)出了優(yōu)異的超疏水性,而且對從強酸到強堿整個PH范圍內(nèi)的水溶液都表現(xiàn)出了同樣的超疏水性能,更兼有良好的環(huán)境穩(wěn)定性。更特別的是固體材料分子本身屬于共軛分子,具有顯著的熒光特性,這也預(yù)示著其在新型智能、光電傳感等領(lǐng)域的應(yīng)用潛力。
[Abstract]:Organic electroluminescent display (Organic Light-emitting Diode Display, OLED Display) because of its low energy consumption, wide viewing angle, high speed switching and high contrast and showed great potential in application. The polymer light-emitting display (Polymer Light-emitting Diode Display, PLED Display) as the material in the whole visible light color adjustable. The solution can be simple processing and is suitable for flexible production and large area devices have attracted more attention. The spin coating method is undoubtedly the most convenient and solution processing films of good quality, but generally only can be used for the preparation of monochrome display, not patterned polymer films of different colors to achieve full-color display, and materials waste. In polymer light-emitting film patterning technology, inkjet printing because of its processing process is simple and efficient, high material utilization rate, suitable for processing solution, Suitable for flexible substrate, easy integration and automation of roll roll process, is considered to be the most potential technology. High quality polymer film preparation is the key to fabricate PLED devices, but the inkjet droplet in the drying process is usually accompanied by a "coffee ring" phenomenon, caused by uneven deposition of thin film we in polyfluorene blue emitting material PFSO as the research object, systematically studied the type of solvent, ink concentration, substrate temperature, influence of printing parameters and other factors on the film morphology. Experimental results show that these factors can indirectly affect the droplet three contact line pinning time and capillary flow strength of tie nail after the formation, thus affecting the morphology of drying droplets. Delay or inhibition of the contact line pinning is conducive to the formation of films. In the point of contact line pinning, can decrease the solvent evaporation uneven form Capillary flow, the migration rate of solvent evaporation rate and solute equilibrium, realize the uniform deposition of solute. Through systematic regulation of the solvent and the concentration of no substrate successfully by using the single solvent ink at room temperature on the print out a clear boundary, the surface of thin film is uniform. In the preparation of ink-jet printing PLED display process how to prepare, print ink droplet stability, how to achieve precise positioning of the droplet, how to control the film quality and resolution and how to optimize the device structure, are the important factors to be considered in the preparation of high performance display. We adjust the print and print parameters to control droplet print stability. The size and precise positioning, print droplets in pixels in high resolution uniform deposition without overflow. In addition, we design a new type of pixel node The success of the substrate, simplifies the operation process, and improve the uniformity of the pixels inside the film; finally through the further optimization of the buffer layer (Buffer Layer) and the thickness of the emitting layer thickness, the printing device efficiency of contrast devices (corresponding spin devices) efficiency of 75%. in solving a series of technical problems, we successfully print a defect free 3 inches 120ppi screen. Blue polymer has certain effect on solid surface wettability of solution processing uniformity and print resolution, is an important scientific problem facing all solution processing technology. Through the research on the structure of solid surface and liquid behavior, invasive regulation of solid surface. The experimental research and practical application has important significance. In particular, the super hydrophobic as an extreme phenomenon of invasive, has a wide application prospect. We use the solution processing The method of preparation of self support, flexible, transparent, with the fluorescence emission properties of super hydrophobic organic composite films. Among them, 1 organic compounds by molecular self-assembly of hierarchical micro / nano structure of the surface of the liquid film infiltration transition state by Wenzel state to the Cassia state of the prepared composite. The film showed excellent superhydrophobicity, and the aqueous solution from strong acid to alkali the whole range of PH have shown super hydrophobic properties also, with a good environment stability. Especially for the solid material itself belongs to molecular conjugated molecules with fluorescence characteristics significantly, which also indicates that the a new intelligent, potential applications of photoelectric sensing and other fields.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN873.3;TP391.73

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