微纳结构光调控的高效有机发光二极管研究

发布时间：2018-02-27 08:22

本文关键词： 有机发光二极管光提取白光叠层色稳定性运行稳定性　出处：《苏州大学》2015年硕士论文　论文类型：学位论文

【摘要】：有机发光二极管(OLED)已经在全彩显示屏、可穿戴设备以及环境友好的室内照明领域获得越来越高的关注度。特别是,叠层和白光OLED技术由于本身具有高效率,长寿命等优点,在下一代的照明工程中备受瞩目。随着新型高效磷光与热延迟荧光材料的研发,OLED器件的内量子效率已经接近100%。然而,由于受到传统平面化器件构筑方式引发的波导效应的严重影响,OLED器件外量子效率通常只能达到20%左右,这在很大程度上制约着OLED器件的实际应用。为此,如何提高OLED器件光提取效率成为该领域的热点。本论文主要以OLED器件光学调控作为研究目标,通过对OLED器件中光学损耗机制的系统性研究,深化对微纳结构光调控特性的理解。在宽光谱、广视角、偏振不敏感的高效减反原则的指导下,设计出适用于OLED器件光提取的准周期或随机纳米光调控结构(DAN)。与此同时,基于软纳米压印技术,提出并实现了纳米图案化OLED器件制备方法。采用DAN光调控结构,制备了单层和叠层OLED器件,实现了光提取效率提升。结合光学模拟,探讨了DAN结构与光学模式的耦合,揭示了宽光谱、广视角的光调控机制。具体而言,纳米图案化器件的光提取效率相较于平面化器件,增强因子高达2.6;同时,纳米图案化叠层器件的工作寿命是单层平面化器件的10倍以上。其次,引入光调控结构,缓解了叠层结构中光学干涉或微腔效应导致的角度色谱漂移问题。考虑到白光OLED器件的宽光谱特性,我们进一步优化了DAN结构参数和纳米压印条件。同时设计合适的层叠式排布的能级结构,实现具有高效电光转换效率和光提取效率的超高性能纳米图案化白光OLED器件。实验结果表明,纳米图案化白光器件具有较高的亮度-光谱稳定性和极好的角度色稳定性。
[Abstract]:Organic light-emitting diodes (OLED) have gained increasing attention in the fields of full-color display, wearable devices and environmentally friendly indoor lighting. In particular, laminated and white-light OLED technologies have the advantages of high efficiency, long life, etc. In the next generation of lighting engineering, the quantum efficiency of OLED devices is approaching 100 with the development of novel high-efficiency phosphorescence and thermal delay fluorescent materials. Due to the influence of waveguide effect caused by the traditional planar device construction method, the external quantum efficiency of OLED device is usually only about 20%, which restricts the practical application of OLED device to a great extent. How to improve the optical extraction efficiency of OLED devices has become a hot topic in this field. In this paper, the optical control of OLED devices is taken as the research goal, and the mechanism of optical loss in OLED devices is systematically studied. Under the guidance of the principle of wide spectrum, wide viewing angle and polarization insensitivity, a quasi-periodic or random nano-light control structure suitable for optical extraction of OLED devices was designed. At the same time, Based on soft nano-imprint technology, the fabrication method of nano-patterned OLED devices is proposed and realized. Monolayer and laminated OLED devices are fabricated by using DAN optical control structure, and the efficiency of optical extraction is improved. The coupling of DAN structure and optical mode is discussed, and the light regulation mechanism of wide spectrum and wide angle of view is revealed. In particular, the optical extraction efficiency of nano-patterned devices is as high as 2.6 compared with that of planar devices, and at the same time, The working life of nano-patterned laminated devices is more than 10 times longer than that of single-layer planar devices. The problem of angle chromatographic drift caused by optical interference or microcavity effect in laminated structure is alleviated. Considering the wide spectrum characteristics of white light OLED devices, We further optimize the structural parameters of DAN and the conditions of nano-imprint. At the same time, we design a suitable stacked energy level structure. An ultra-high performance nano-patterned white OLED device with high efficiency electro-optic conversion efficiency and optical extraction efficiency is realized. The experimental results show that the nano-patterned white light device has high luminance spectral stability and excellent angle color stability.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN383.1

【共引文献】