本文選題：OLED + Langmuir-Blodgett膜法　； 參考：《重慶大學(xué)》2015年碩士論文

【摘要】：有機(jī)電致發(fā)光器件(Organic electroluminescent Device,簡(jiǎn)稱(chēng)OLED),具有輕薄、面發(fā)光、自發(fā)光,柔性可彎曲、透明等優(yōu)勢(shì),在照明以及顯示領(lǐng)域具有廣闊的應(yīng)用前景。OLED器件有機(jī)層為有機(jī)化學(xué)材料,利用有機(jī)材料制備發(fā)光層工藝有真空蒸鍍、旋涂、噴墨打印、織網(wǎng)印刷等工藝。這幾種工藝制備的有機(jī)層中分子呈無(wú)序排列,而載流子在分子無(wú)序排列的有機(jī)薄膜中傳輸效率較低,從而對(duì)OLED器件的光致發(fā)光效率有一定影響。L-B(Langmuir-Blodgett)膜技術(shù)是在適當(dāng)?shù)臈l件下,將兼具親水頭和疏水尾的兩親性分子分散在水面上,經(jīng)逐漸壓縮其水面上的占有面積,使其排列成單分子層,再將其轉(zhuǎn)移沉積到固體基底上所得到的一種分子有序性排列薄膜。利用LB膜法制備的有機(jī)發(fā)光層由于分子有序排列,載流子傳輸效率增加,進(jìn)而提高OLED器件的電光效率。目前有研究者將LB膜技術(shù)應(yīng)用在化學(xué)領(lǐng)域,利用分子的有序排列提高催化效率;也有研究者將LB膜技術(shù)運(yùn)用到生物半透膜領(lǐng)域。將LB膜技術(shù)運(yùn)用到OLED器件的有機(jī)層制備中報(bào)道甚少,研究LB膜在有機(jī)層中的作用機(jī)理更是鮮有報(bào)道。本文研究了OLED器件中常見(jiàn)的空穴傳輸材料-聚乙烯基咔唑(PVK)的LB膜法制備原理和技術(shù)。為了明確LB膜中分子有序排列對(duì)薄膜光學(xué)以及電學(xué)性能的影響,同時(shí)采用LB膜法和旋涂法制備PVK有機(jī)薄膜,并建立LB膜法和旋涂法制備PVK薄膜模型。對(duì)兩種工藝制備的PVK有機(jī)薄膜進(jìn)行光學(xué)和電學(xué)性能的測(cè)試與比較。本文具體工作如下:①建立了PVK有機(jī)薄膜的LB膜法制備模型。包括有PVK的甲苯溶液在超純水表面分散的均勻性以及穩(wěn)定性等。分析基片親水性機(jī)理以及薄膜與基片、薄膜與薄膜之間的作用機(jī)理。最后從理論上說(shuō)明了分子有序排列對(duì)載流子傳輸?shù)挠绊憽＂谘芯苛薒B膜法制備PVK薄膜過(guò)程中不同親水工藝對(duì)ITO基片透光率以及面電阻影響。利用自制LB拉膜儀制備PVK LB膜,研究了分散劑比例對(duì)PVK薄膜電阻率以及膜厚的影響。制備了單層至多層PVK LB薄膜并測(cè)試薄膜的膜厚、紫外-可見(jiàn)吸光光譜、熒光光譜、電阻率等性能參數(shù)。③根據(jù)旋涂規(guī)律,通過(guò)旋涂實(shí)驗(yàn)中改變不同濃度以及轉(zhuǎn)速得到的數(shù)據(jù),建立PVK的旋涂模型。制備與LB膜法相同厚度的PVK薄膜,并測(cè)試薄膜膜厚、吸光度、熒光光譜等性能參數(shù)。④分析了有序性分子排列促進(jìn)載流子傳輸?shù)臋C(jī)理。對(duì)比兩種工藝制備出相同厚度薄膜的電阻率、吸光度以及熒光光譜。并對(duì)有關(guān)結(jié)果進(jìn)行探討。
[Abstract]:Organic electroluminescent devices (OLEDs) have the advantages of lightness, surface luminescence, self-luminescence, flexible bending and transparency, etc. The organic layer of OLED devices has a broad application prospect in the field of lighting and display. The organic layer of OLED devices is an organic chemical material. There are vacuum evaporation, spin coating, inkjet printing, screen printing and so on. The molecules in the organic layers prepared by these processes are disordered, while the carrier transport efficiency is low in the organic films with the molecular disordered arrangement, which has a certain influence on the photoluminescence efficiency of OLED devices. The technology of Langmuir-Blodgetttt. is under the appropriate conditions. The amphiphilic molecules with both hydrophilic head and hydrophobic tail are dispersed on the water surface, and the occupied area on the water surface is gradually compressed to form a monolayer layer, and then transferred to a solid substrate to obtain a molecular ordered arrangement film. Due to the ordered arrangement of molecules, the carrier transport efficiency of the organic luminescent layer prepared by LB film method is increased, thus improving the electro-optic efficiency of OLED devices. At present, some researchers have applied LB film technology to the chemical field to improve the catalytic efficiency by using ordered arrangement of molecules, while others have applied LB film technology to the field of biological semi-permeable film. The application of LB film technology to the preparation of organic layers of OLED devices is rarely reported, and the mechanism of LB films acting in organic layers is rarely reported. In this paper, the preparation principle and technology of the common hole transport material-poly (vinyl carbazolium) PVK in OLED devices by LB film method have been studied. In order to find out the effect of ordered molecular arrangement on optical and electrical properties of LB films, PVK organic films were prepared by LB and spin coating methods, and the PVK film models were established by LB and spin-coating methods. The optical and electrical properties of PVK films prepared by two kinds of processes were tested and compared. The main work of this paper is as follows: 1. The preparation model of PVK organic thin films by LB method has been established. It includes the uniformity and stability of toluene solution with PVK on the surface of ultrapure water. The hydrophilic mechanism of the substrate and the interaction mechanism between the film and the substrate and between the film and the film are analyzed. Finally, the effect of ordered arrangement of molecules on carrier transport is explained theoretically. 2. The effects of different hydrophilic processes on the transmittance and surface resistance of PVK substrates in LB films are studied. The effect of dispersant ratio on the resistivity and thickness of PVK LB films was studied by using a self-made LB film drawing apparatus. Monolayer to multilayer PVK LB thin films were prepared and the film thickness, UV-Vis absorption spectrum, fluorescence spectrum and resistivity were measured. 3. According to the rule of spin coating, the data obtained by changing different concentration and rotational speed in spin-coating experiment were obtained. The spin coating model of PVK was established. PVK thin films of the same thickness as LB films were prepared. The mechanism of ordered molecular arrangement to promote carrier transport was analyzed by measuring the film thickness, absorbance and fluorescence spectrum. The resistivity, absorbance and fluorescence spectra of the films of the same thickness were obtained by comparing the two processes. The results are discussed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN383.1

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