本文關(guān)鍵詞：溶液加工有機(jī)電致發(fā)光器件陰極界面層的應(yīng)用與研究　出處：《華南理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 溶液加工 陰極界面 印刷 溶劑 有機(jī)電致發(fā)光二極管

【摘要】：有機(jī)發(fā)光二極管(OLEDs)因其獨(dú)特的優(yōu)勢(shì),在大面積平板顯示器和固態(tài)照明上展現(xiàn)出巨大潛力,受到了各類(lèi)研發(fā)單位和企業(yè)的重視。OLEDs制備工藝主要有蒸鍍技術(shù)和溶液加工技術(shù)。相比于蒸鍍技術(shù),溶液加工制備OLEDs技術(shù)具備低成本易于大面積生產(chǎn)的優(yōu)勢(shì),目前,溶液加工制備OLEDs仍然存在一些技術(shù)難題,如器件的效率,壽命,穩(wěn)定性等。如何在現(xiàn)有的材料基礎(chǔ)之上,對(duì)器件性能進(jìn)行大幅度改善,這就主要取決于器件的結(jié)構(gòu)和物理機(jī)制的研究。有機(jī)電致發(fā)光器件(OLEDs)是雙注入型器件,器件效率主要依賴(lài)于電子和空穴載流子從兩端平衡有效的注入,器件界面工程的研究是幫助電子和空穴有效注入一種可行的方法。由于大多數(shù)有機(jī)發(fā)光材料具有較低LUMO能級(jí),發(fā)光層和金屬陰極存在較大注入勢(shì)壘,要想獲得高效穩(wěn)定的器件,這就需要降低電子的注入勢(shì)壘。通常,通過(guò)在陰極引進(jìn)陰極界面層,以降低電極和有機(jī)發(fā)光層界面之間的勢(shì)壘,幫助電子有效注入。本文中采用了商業(yè)化的聚合發(fā)光材料P-PPV和簡(jiǎn)單的器件結(jié)構(gòu),以陰極界面層作為研究對(duì)象,基于溶液加工的方式來(lái)研究發(fā)光器件的陰極界面層,以獲得高效穩(wěn)定的發(fā)光器件。立足于高效率穩(wěn)定的印刷型的聚合物電致發(fā)光器件,我們把新穎的交聯(lián)基團(tuán)的、醇溶性的、胺基功能化共軛聚合物(PF3N-OX)和少量環(huán)氧樹(shù)脂(Epoxy)共混形成功能緩沖層,引入到陰極噴墨的聚合物發(fā)光二極管中,制備出了低啟亮電壓、高效率的印刷型的器件。緩沖層位于印刷陰極和發(fā)光層之間,它能夠阻止溶劑侵蝕,保證電子有效注入。陰極印刷Ag電極器件的啟亮電壓降低到3.25 V,最大電流效率(LEmax)達(dá)到8.77 cd/A,相比于蒸鍍型Ag電極器件,噴墨打印Ag電極器件的啟亮電壓降低了2.25 V,器件的最大亮度提高了70%。值得注意,采取噴墨打印制備的導(dǎo)電納米顆粒陰極能保證高分辨率的陰極圖案,以及精細(xì)陰極的良好導(dǎo)通,且加工過(guò)程中不會(huì)對(duì)有機(jī)層產(chǎn)生機(jī)械壓力。我們用含有氧化乙烯官能團(tuán)的醚溶劑修飾陰極界面制備高效穩(wěn)定鋁陰極聚合物電致發(fā)光器件。實(shí)驗(yàn)中,我們通過(guò)旋涂適量的醚溶劑到聚合物發(fā)光層薄膜表面,隨后,蒸鍍金屬鋁(Al)電極。器件光電性能測(cè)試結(jié)果表明,醚溶劑處理后,Al陰極器件最大電流效率是19.54 cdA-1,此時(shí)電壓5.25 V,相比沒(méi)有醚溶劑處理的器件,效率有三十幾倍的提高。效率的提高是由于有機(jī)功能層和Al電極的陰極界面層電子注入勢(shì)壘降低,光生伏打測(cè)試和X射線(xiàn)光電子能譜儀的結(jié)果證明,真空蒸鍍的Al可以氧化殘留的醚溶劑,產(chǎn)生了碳化物,這種碳化物有利于電子注入勢(shì)壘降低,幫助了電子注入。
[Abstract]:Organic light emitting diodes (OLEDs) show great potential in large-area flat-panel displays and solid-state lighting due to their unique advantages. All kinds of R & D units and enterprises pay attention to. OLEDs preparation technology mainly includes evaporation technology and solution processing technology, compared with evaporation technology. Solution processing (OLEDs) technology has the advantages of low cost and easy to be produced in large area. At present, there are still some technical problems in the preparation of OLEDs by solution processing, such as the efficiency and lifetime of devices. How to improve the performance of the device based on the existing materials. This mainly depends on the research of the structure and physical mechanism of the device. The organic electroluminescent device (OLEDs) is a dual-injection device. The device efficiency mainly depends on the effective injection of electron and hole carriers from both ends. The study of device interface engineering is a feasible method to help the effective injection of electrons and holes. Because most organic luminescent materials have lower LUMO energy level, there are large injection barriers in the luminescent layer and metal cathode. In order to obtain efficient and stable devices, it is necessary to reduce the electron injection barrier. Generally, the cathode interface layer is introduced at the cathode to reduce the barrier between the electrode and the organic luminescent layer interface. In this paper, a commercial polymeric luminescent material P-PPV and a simple device structure are used, and the cathode interface layer is used as the research object. Based on the solution processing method, the cathode interface layer of the luminescent device is studied to obtain the high efficiency and stable luminescent device, which is based on the high efficiency and stable printing polymer electroluminescent device. A novel cross-linked group, alcohol-soluble, amine-functionalized conjugated polymer (PF3N-OX) was blended with a small amount of epoxy resin to form a functional buffer layer. A low starting voltage and high efficiency printed device was fabricated by introducing it into the polymer light-emitting diode with cathode inkjet. The buffer layer is located between the printed cathode and the luminescent layer, which can prevent solvent erosion. To ensure effective electron injection, the starting voltage of cathode printed Ag electrode device is reduced to 3.25 V, and the maximum current efficiency is 8.77 cd/A. Compared with the evaporated Ag electrode device, the starting voltage of the ink-jet printing Ag electrode device is reduced by 2.25 V, and the maximum brightness of the device is increased by 70 parts. The conductive nano-particle cathode prepared by inkjet printing can guarantee high resolution cathode pattern and good conduction of fine cathode. In addition, there is no mechanical pressure on the organic layer in the process of processing. High efficient and stable aluminum cathode polymer electroluminescent devices are prepared by modifying the cathode interface with ether solvent containing ethylene oxide functional group. We spin-coated a proper amount of ether solvent onto the surface of the polymer luminescent film and then evaporated the Al-Al electrode. The photoelectric properties of the device showed that the solvent was treated with ether. The maximum current efficiency of Al cathode device is 19.54 cdA-1, and the voltage is 5.25 V, compared with the device without ether solvent treatment. The efficiency is improved by more than 30 times. The efficiency is due to the decrease of electron injection barrier between the organic functional layer and the cathode interface layer of Al electrode. The results of photovolt test and X-ray photoelectron spectrometer show that the increase is due to the decrease of the electron injection barrier in the cathode interface layer of the organic functional layer and the Al electrode. The vacuum evaporated Al can oxidize the residual ether solvent and produce carbides. This kind of carbides is conducive to the reduction of the electron injection barrier and helps the electron injection.
【學(xué)位授予單位】：華南理工大學(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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