表面等离子体有机红光发光器件

发布时间：2018-08-12 10:01

【摘要】：有机电致发光器件(OLED)因具有亮度高、响应快、高效节能、柔性、成本低等优点,在平板显示和固态照明等领域具有潜在而广泛的应用前景。为了推进OLED产业化,其效率和寿命有待进一步提升。近几年,因表面等离子体(SP)可以提高OLED发光性能,故而在OLED的研究中备受人们关注。基于金属纳米粒子产生的局部表面等离子体(LSP)因制备工艺简单、易操控、成本低,因而被广泛研究。在局部表面等离子体OLED中,金属纳米粒子可位于发光层(EML)之前的空穴传输层(HTL)或是EML之后的电子传输层(ETL)。也有部分研究工作直接将其沉积在金属反射电极之下。根据前人报道,金属纳米粒子位于HTL中有可能提升OLED性能,也有可能降低OLED性能。针对上述争议,本文中使用溶液方法合成的纳米粒子开展了相关的研究工作。本论文将合成的Au纳米棒旋涂于空穴注入层(HIL)与HTL之间,通过(1)改变HTL厚度以调整Au纳米棒和EML间的距离、(2)变磷光材料为荧光材料以改变发光客体的寿命、(3)换Au纳米棒为Au纳米立方体以获得与客体发光光谱交叠更好的共振光谱等手段,深入研究了Au纳米粒子对OLED电学性能与发光性能的影响,探索了表面等离子体的主要工作机理。研究结果表明,(1)Au纳米棒与红色磷光体Ir(MDQ)2(acac)间未发生耦合,Au纳米棒、纳米立方体与红色荧光体DCJTB激子发生了耦合作用;(2)虽然表面等离子体可以与红色荧光体DCJTB激子发生耦合,提高DCJTB的辐射复合速率,但是Au纳米棒或Au纳米立方体的引入都无法提升OLED性能。我们的研究结果暗示着表面等离子体对于OLED性能提升的因素很多,不仅限于文献中报道的辐射复合速率增加这一点,进一步的研究工作仍在进行中。
[Abstract]:Organic electroluminescent devices (OLED) have potential and wide application prospects in flat panel display and solid state lighting due to their advantages of high brightness, fast response, high efficiency and energy saving, flexibility and low cost. In order to promote the industrialization of OLED, its efficiency and service life need to be further improved. In recent years, surface plasma (SP) has attracted much attention in the research of OLED because it can improve the luminescence performance of OLED. Local surface plasma (LSP) based on metal nanoparticles has been widely studied because of its simple preparation process, easy manipulation and low cost. In local surface plasma OLED, metal nanoparticles can be located in the hole transport layer (HTL) in front of the luminescent layer (EML) or in the electron transport layer (ETL).) after EML. Part of the work directly deposited it under the metal reflecting electrode. According to previous reports, metal nanoparticles located in HTL may improve the performance of OLED and decrease the performance of OLED. In this paper, the nanoparticles synthesized by solution method have been studied. In this thesis, au nanorods were spin-coated between (HIL) and HTL. By changing the thickness of HTL to adjust the distance between au nanorods and EML, (2) changing phosphorescent materials into fluorescent materials to change the lifetime of luminescent objects, (3) replacing au nanorods as au nanometers to obtain better overlaps with guest luminescent spectra. Resonance spectroscopy, etc. The effects of au nanoparticles on the electrical and luminescent properties of OLED were investigated, and the main working mechanism of surface plasmas was explored. The results show that (1) there is no coupling between au nanorods and red phosphorescent Ir (MDQ) _ 2 (acac), while the nanocrystalline nanorods are coupled with red fluorescent DCJTB excitons. (2) although the surface plasma can be coupled with the red fluorescent DCJTB excitons, there is no coupling between the au nanorods and the red phosphorescent Ir (MDQ) _ 2 nanorods. The radiation recombination rate of DCJTB is increased, but neither au nanorods nor au nanometers can improve the OLED performance. Our results suggest that there are many factors contributing to the enhancement of OLED performance by surface plasmas, not only the increase in the radiation recombination rate reported in the literature, but also that further studies are still under way.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN214

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