蓝光磷光有机发光二极管主体材料的合成及表征

发布时间：2018-01-10 20:20

本文关键词：蓝光磷光有机发光二极管主体材料的合成及表征　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(Organic Light Emitting Diodes, OLED)在平板显示和固态照明方面有很好的应用前景,因此得到了来自学术界和工业界的广泛关注。通过近三十年的发展,特别是在磷光有机发光二极管(PHOLED)的概念提出之后,OLED的效率有了极大的提高。现阶段,红光和绿光PHOLED的效率和寿命都已经达到了可产业化的程度,但是蓝光PHOLED的效率和寿命一直是OLED产业发展的短板,这就严重制约了OLED在全彩显示和白光照明中的应用。因此提高蓝光PHOLED的效率和寿命是十分必要且有意义的课题。与绿光及红光PHOLED相比,蓝光PHOLED对主体材料的要求较高,主体材料性质的优化是提高蓝光PHOLED效率的关键。所以本论文中涉及到的主要工作是基于1,2,4-VA二唑这种新型拉电子基团设计并将其应用于蒸镀器件中的主体材料,和应用于旋涂器件中的电子传输型主体材料以及可应用于旋涂器件的空穴传输型主体材料。本文为设计高三线态蓝光PHOLED主体材料提供了一种新型的拉电子基团,主要内容包括：1.基于1,2,4-VA二唑的对称型磷光主体材料：与1,2,5-VA二唑和1,3,4-VA二唑相比1,2,4-VA二唑在有机光电领域还没有得到充分的应用,而且与前两种基元相比,相当于间位链接的1,2,4-VA二唑应该有更高的三线态,这个优点可以被利用来给蓝光PHOLED设计高三线态的主体材料。所以在这一部分工作中,我们创新性的应用了1,2,4-VA二唑作为拉电子基团,设计并合成了两个双极性主体材料,两种材料的三线态分别为2.71 eV和2.81eV,可以做蓝光客体材料FIrpic(双(4,6-二氟苯基毗啶-N,C2')吡啶甲酰合铱)的主体。2.基于1,2,4-VA二唑的非对称型磷光主体材料：在上一章中我们只是利用1,2,4-VA二唑本身的间位连接性质得到了与1,3,4-VA二唑衍生物相比三线态较高的主体材料,使其可以应用在蓝光PHOLEDs中。在本章中我们着重研究了1,2,4-VA二唑单元本身的不对称性对材料性质的影响。在这一章中我们重新排列了分子的构成单元然后合成了两个新的不对称主体材料,结构上的细微变化使器件效率得到了极大的提高。3.基于1,2,4-嗯二唑的电子传输型旋涂磷光主体材料：尽管真空蒸镀法制备OLEDs器件是常用的且十分成熟的方法,但是它本身就存在一些问题,例如材料利用率低,蒸镀过程中测量的不准确性,装置成本高,高真空度要求以及操作复杂等。旋涂法制备OLEDs器件的引入很好的解决了以上问题,但是旋涂器件中对材料的要求更高了。除了对传统蒸镀器件中材料的要求,旋涂材料的溶解性,溶液成膜性以及材料的玻璃化转变温度等都有较高的要求。虽然PVK搭配OXD-7的体系在旋涂器件中应用十分广泛,但是OXD-7的三线态只有2.69 eV,不能应用在深蓝光PHOLEDs中,所以在本章的工作中我们通过用1,2,4-嗯二唑取代1,3,4.嗯二唑的方式得到了两种三线态更高的电子传输型主体材料,我们将这几种材料应用在深蓝光PHOLEDs中。4.基于芴螺三苯胺的空穴传输型旋涂磷光主体材料：在上一章中,我们在保留PVK的基础上,新合成了3种电子型的主体材料,但是用这些材料制作的器件的效率并不高,特别是器件的起始电压比较高。我们认为是由于聚合物做主体的原因导致的起始电压偏高,所以在本章的工作中我们合成了一系列小分子空穴传输型材料。搭配电子传输型材料OXD-7制备了蓝光旋涂PHOLEDs器件,与聚合物PVK做主体的器件相比,效率有了明显的提高。
[Abstract]:Organic light emitting diode (Organic Light Emitting Diodes, OLED) has a good prospect of application in flat-panel display and solid-state lighting, so it has got extensive attention from academia and industry. Through nearly thirty years of development, especially in phosphorescent organic light emitting diode (PHOLED) after the concept was put forward, the efficiency of OLED is improved greatly. At present, the efficiency and life of red and green PHOLED has already reached the level of industrialization, but the efficiency and life of blue PHOLED has been a short board in the development of OLED industry, which seriously restricts the application of OLED in full-color display and white light illumination. Therefore, improving the efficiency and lifetime of Blu ray PHOLED is very necessary and meaningful. Compared with the green and red PHOLED, higher requirements for the main material of the blue PHOLED, optimization of the main properties of the material is to improve the efficiency of the blue PHOLED The key. So the main work of this paper is related to the 1,2,4-VA two with this new type of electron withdrawing group design based on its application in evaporation device of the main material, and electronic transmission type main materials used in the spin coating device and can be applied to the spin coating device hole transmission type main material in this paper. Provide a new type of electron withdrawing group for the design of triplet blue PHOLED main material, the main contents include: 1. the main symmetric phosphorescent material 1,2,4-VA two was based on: compared with 1,2,5-VA two and 1,3,4-VA two with 1,2,4-VA two with ribavirin has not been fully applied in the field of organic light and electricity, compared with the previous two based 1,2,4-VA yuan, the equivalent of a link between of two should have a higher three line state, this advantage can be utilized to design the blue PHOLED triplet of the main material. So in this part of the work In our innovative use of 1,2,4-VA two as with electron withdrawing group, and two bipolar host material was synthesized. Two materials three state line are respectively 2.71 eV and 2.81eV, can make the material object FIrpic (double blue (4,6- two fluorine phenyl pyridine -N, C2') pyridine methanoyl alloy the main body of.2.) iridium based on asymmetric phosphorescent material 1,2,4-VA two was: in the last chapter, we only use two of the 1,2,4-VA between properties have been compared with the 1,3,4-VA two derivatives three linewise high body material, which can be used in the Blu ray PHOLEDs. In this chapter we the effects of asymmetric 1,2,4-VA two triazole unit itself on the properties of the materials. In this chapter we rearrange the molecular units and then synthesized two asymmetric main material new, subtle changes in the structure of the device efficiency was To improve the.3. electronic transmission type rotary 1,2,4- two were well coated phosphorescent host material based on although the vacuum evaporation deposition of OLEDs devices are commonly used and very mature methods, but it has some problems, such as low material utilization ratio, measurement of evaporation in the process of inaccuracy, the cost of the device high, high vacuum and complicated operation. The introduction of OLEDs prepared by spin coating device is a good solution to the problem, but the spin devices of material requirements higher. In addition to the traditional evaporation device material requirements, the solubility of spin coating material, film forming material and solution the glass transition temperature have higher requirements. Although the application of PVK OXD-7 system collocation in the spin coating device is very extensive, but the OXD-7 three line state is only 2.69 eV, can not be used in blue light PHOLEDs, so in the second part of the work We use 1,2,4- two um azole substituted 1,3,4. well two were way to get the electronic transmission type main material two three linewise higher, we will transfer type rotary screw hole three fluorene aniline coated phosphorescent host material based on Application of several materials in the blue light PHOLEDs in.4.: in the previous chapter, we based on the retention of PVK, a new synthesized 3 kinds of electronic type main material, but the efficiency of the device from these materials is not high, especially the starting voltage of the device is relatively high. We think it is because of the start voltage causes the high polymer as the main body, so the work in this chapter we synthesized a series of small molecule hole transporting material. The spin coated PHOLEDs devices by blue collocation electronic transmission type OXD-7 materials, compared with polymer PVK device as the main body, the efficiency has been significantly improved.

【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】：TQ25;TN383.1

【共引文献】