本文選題：有機(jī)電致發(fā)光器件　切入點(diǎn)：藍(lán)光OLED　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：有機(jī)電致發(fā)光器件(Organic Light-Emitting Diode,OLED),是以有機(jī)物為發(fā)光材料的新型電致發(fā)光器件。憑借著其制備工藝簡(jiǎn)單、視角寬、響應(yīng)時(shí)間短、發(fā)光亮度高、全固體化、重量輕、可實(shí)現(xiàn)柔性化器件、全色顯示等一系列獨(dú)特的優(yōu)點(diǎn),OLED有望成為新一代顯示和照明的的中堅(jiān)力量,在顯示器件中極具競(jìng)爭(zhēng)力,被認(rèn)為是未來(lái)的主流平板顯示技術(shù),引起了人們的廣泛關(guān)注。經(jīng)過(guò)幾十年的發(fā)展,有機(jī)電致發(fā)光器件開(kāi)始走向成熟。但是有機(jī)電致發(fā)光器件在結(jié)構(gòu)優(yōu)化、器件效率等方面還不盡人意。因此,各國(guó)研究人員都努力著去優(yōu)化器件的性能。本文通過(guò)對(duì)不同結(jié)構(gòu)OLED器件的發(fā)光機(jī)理、制備工藝以及電學(xué)特性、載流子遷移率的計(jì)算和光學(xué)特性的分析,主要研究了有機(jī)電致發(fā)光器件中不同功能層對(duì)器件性能的影響,不同有機(jī)電致發(fā)光材料性能以及有機(jī)電致發(fā)光器件的結(jié)構(gòu)與發(fā)光理論模型。由于有機(jī)電致發(fā)光器件的每個(gè)功能層厚度都在納米量級(jí),最薄的空穴隔離層可以達(dá)到1 nm的厚度,所以在實(shí)驗(yàn)制備過(guò)程中,盡量減少污染,控制成膜特性都成為制備高質(zhì)量器件的關(guān)鍵因素。實(shí)驗(yàn)采用真空熱蒸鍍進(jìn)行有機(jī)物的鍍膜、采用電阻熱蒸鍍進(jìn)行無(wú)機(jī)物和金屬電極的蒸鍍,完成發(fā)光器件的制備。采用Alq3和CBP作為發(fā)光物質(zhì),從最基本的單層器件(只包含陰極、發(fā)光層和陽(yáng)極)開(kāi)始,逐漸加入空穴傳輸層(有機(jī)材料NPB)、空穴隔離層(無(wú)機(jī)材料LiF)和空穴注入緩沖層(無(wú)機(jī)材料三氧化鉬),分別測(cè)量每一種器件的電流—電壓關(guān)系、進(jìn)而計(jì)算得到電流密度—電壓的關(guān)系。利用空間電荷限制電流法(SCLC)和構(gòu)造特殊函數(shù)法,計(jì)算器件內(nèi)載流子的遷移率,并與文獻(xiàn)中的載流子遷移率的大小進(jìn)行對(duì)比,判斷器件質(zhì)量。進(jìn)一步測(cè)量器件發(fā)光光譜,發(fā)光亮度—電壓關(guān)系,確定器件的開(kāi)啟電壓、最佳工作電壓和擊穿電壓等。而在對(duì)OLED的研究中,制備藍(lán)光器件是OLED發(fā)展的重中之重,無(wú)論是對(duì)顯示還是白光OLED照明的研制都具有非常重要的意義。尤其是非摻雜藍(lán)光OLED器件在之前的實(shí)驗(yàn)中并沒(méi)有被廣泛報(bào)道過(guò)。而本文成功制備的結(jié)構(gòu)為Glass/ITO/MoO3/NPB/CBP/LiF/Al的藍(lán)光OLED在之前并沒(méi)有被深入研究,其發(fā)光光譜峰值位于450 nm和490nm,這種非摻雜的藍(lán)光OLED結(jié)構(gòu)可以為今后對(duì)藍(lán)光OLED的研究提供參考。最后,本文從實(shí)驗(yàn)得到的數(shù)據(jù)中總結(jié)有機(jī)電致發(fā)光器件的發(fā)光規(guī)律。為后續(xù)研究者提供了理論上的支持。
[Abstract]:Organic Light-Emitting diode device is a new type of electroluminescent device with organic material as luminescent material. With its simple preparation process, wide angle of view, short response time, high luminescence brightness, full solids and light weight, flexible devices can be realized. A series of unique advantages, such as panchromatic display, are expected to become the backbone of the new generation of display and lighting. They are highly competitive in display devices and are considered to be the mainstream flat-panel display technology in the future. After decades of development, organic electroluminescent devices begin to mature, but there are electroluminescent devices in the structure optimization, device efficiency and other aspects are not satisfactory. Researchers all over the world are trying to optimize the performance of OLED devices. In this paper, we analyze the luminescence mechanism, fabrication process, electrical properties, carrier mobility and optical properties of OLED devices with different structures. The effects of different functional layers on the performance of organic electroluminescent devices are studied. Different properties of organic electroluminescent materials, structure and theoretical model of organic electroluminescent devices. Because the thickness of each functional layer of electroluminescent devices is in nanometer order of magnitude, the thinnest hole isolation layer can reach the thickness of 1 nm. Therefore, in the process of experimental preparation, reducing pollution and controlling the characteristics of film formation are the key factors in the preparation of high quality devices. Alq3 and CBP are used as luminescent materials, starting with the most basic monolayer devices (only cathode, luminescent layer and anode). Gradually adding hole transport layer (organic material NPBN, hole isolation layer (inorganic material LiF) and hole injection buffer layer (inorganic material molybdenum trioxide), measuring the current-voltage relationship of each device, respectively. Then the relationship between current density and voltage is obtained. By using space charge limiting current method (SCLC) and constructing special function method, the mobility of carriers in calculators is compared with the magnitude of carrier mobility in literature. Judging the quality of the device, further measuring the luminescence spectrum of the device, the relationship between luminescence brightness and voltage, determining the starting voltage, the optimum working voltage and the breakdown voltage of the device, etc. In the research of OLED, the preparation of blue light device is the most important development of OLED. Both display and white OLED lighting are of great significance, especially the undoped blue-ray OLED devices have not been widely reported in previous experiments. However, the blue light with Glass/ITO/MoO3/NPB/CBP/LiF/Al structure successfully fabricated in this paper has not been widely reported in previous experiments. OLED has not been studied in depth before, The peak luminescence spectra are at 450nm and 490nm. This non-doped blue-light OLED structure can be used as a reference for the future study of blue-ray OLED. In this paper, the luminescence law of organic electroluminescent devices is summarized from the experimental data, which provides theoretical support for the follow-up researchers.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN383.1

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