基于微纳结构与SAM修饰电极的OLED性能研究

发布时间：2018-05-15 23:16

本文选题：微纳结构 + 自由纳米柱状阵列　；参考：《合肥工业大学》2017年硕士论文

【摘要】：有机电致发光二极管(Organic Light-Emitting Diode,OLED)具有节能、无紫外线、结构简单、可实现柔性等一系列优点,被认为是下一代主流平板显示与照明技术,但目前仍面临着工艺复杂、寿命低、成本高的问题。本论文主要围绕在使用已有有机层结构的基础上,借助微纳结构与自组装单分子层(Self-assembly Molecules,SAM)修饰电极的应用以提升OLED器件的性能。具体研究内容如下:(1)本文分别对PMMA/PS在甲苯和四氢呋喃(THF)中、在不同配比下的成膜情况进行了研究,发现以甲苯做溶剂,在PMMA:PS浓度比为3:7时,能够得到均匀且致密的自由纳米柱状阵列结构。制备OLED器件,测试结果表明自由纳米柱状阵列使得器件的发光光谱变宽,同时有效提升器件亮度。对不同退火温度下的薄膜表面形貌进行测试,发现退火温度高于材料玻璃化温度将会导致薄膜上相邻微纳结构产生团聚,严重影响薄膜表面结构的均匀性与一致性。(2)本文分别以溴乙酸和二氯苯氧乙酸处理ITO,在其上形成自组装单分子层,并研究单分子层对ITO表面性能的影响,结果表明:采用二氯苯氧乙酸处理ITO一方面优化了ITO和后续膜层的接触性能,有利于有机层的成膜,另一方面能降低ITO与后续有机材料之间的空穴注入势垒,提升载流子的传输能力。在结构为ITO/PVK(2000 r/min)/FIrPic:SimCP(2000 r/min)/TPBi(30 nm)/Li F(1 nm)/Al(150nm)的OLED器件中,发现采用经二氯苯氧乙酸处理的ITO作阳极,器件最大亮度提升至1875.2 cd/m2,启亮电压由6.2 V降至5.3 V,器件性能得到提升。在本论文中,通过微纳结构与SAM修饰电极的应用,提升了器件的发光亮度与电流效率。后续实验中,可以从抑制有害离子对有机层的渗透、减小载流子在有机层的堆积这两方面展开以提升器件的寿命。
[Abstract]:Organic Light-Emitting diode (Ole) has a series of advantages, such as energy saving, UV free, simple structure, flexibility and so on. It is considered to be the next mainstream flat panel display and lighting technology, but it still faces complex technology and low life. The problem of high cost. Based on the existing organic layer structure, the performance of OLED devices is improved by the application of micro-nano structure and self-assembled monolayer self-assembly molecules (SAM) modified electrode. The specific research contents are as follows: (1) in this paper, the film-forming conditions of PMMA/PS in toluene and tetrahydrofuran (THF) were studied respectively. It was found that toluene was used as solvent and PMMA:PS concentration ratio was 3:7. A uniform and compact array of free nanocrystalline arrays can be obtained. The experimental results show that the free nano columnar array widens the luminescence spectrum of the device and effectively enhances the luminance of the device. The surface morphology of the films was measured at different annealing temperatures. It was found that the annealing temperature higher than the glass transition temperature would lead to the agglomeration of the adjacent microstructures on the films. In this paper, ITO was treated with bromoacetic acid and dichlorophenoxyacetic acid to form a self-assembled monolayer, and the effect of monolayer on the surface properties of ITO was studied. The results show that on the one hand, the contact properties of ITO and subsequent film are optimized by using dichlorophenoxyacetic acid to treat ITO, and on the other hand, the hole injection barrier between ITO and subsequent organic materials is reduced. Enhance carrier transmission capacity. In the OLED device with the structure of ITO/PVK(2000 r/min)/FIrPic:SimCP(2000 r/min)/TPBi(30 nm)/Li FN 1 NM / Al (150 nm), it is found that the maximum brightness of the device is increased to 1875.2 CD / m 2, and the starting voltage is reduced from 6.2 V to 5.3 V, and the performance of the device is improved by using ITO treated with dichlorophenoxyacetic acid as anode. In this thesis, the luminance and current efficiency of the device are improved by the application of micro-nano structure and SAM modified electrode. In the following experiments, the lifetime of the device can be improved by inhibiting the percolation of harmful ions to the organic layer and reducing the accumulation of carriers in the organic layer.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN383.1

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