高效率、长寿命磷光OLED主体和客体材料的设计、合成与性能研究

发布时间：2018-09-17 11:29

【摘要】：从上世纪八十年代末有机电致发光二极管器件于问世以来,经历近三十年的发展,OLED技术已经取得了很大的进展。无论是科研界还是产业界都对OLED技术有着极大的热情。如今,在效率、光色和器件寿命方面都达到了较高的水平。但是对于制备长寿命蓝光OLED来说,高能级的OLED材料的稳定性仍然是一个巨大的挑战。本论文将以磷光OLED为主要研究内容,以器件中最为重要的发光层为着重点,从器件的效率和稳定性出发,设计合成出不同功能的有机材料,以其获得好效率和长寿命的器件。材料的研究包括高三线态的主体材料、长寿命蓝光客体材料和高效率绿光材料。第一部分工作是关于主体材料的研究。第二章内容关注的是基于吖啶螺芴(SAF)单元,研究已经证明吖啶螺芴单元具有良好的激子传输性能和稳定性。芴的活性位点在对位的2号碳原子,我们常见的芴的衍生物也是对位链接,然而,对位链接不同的功能性基团对材料的单线态和三线态都有着巨大影响。芴的邻位4号碳原子位点的衍生物通常具有较高的三线态能级,遗憾的是制备的器件效率往往都不是很高。我们选择芴的3号碳原子位点,分别与二苯胺和咔唑基团通过碳-氮链接于吖啶螺芴的间位,合成了两个新的主体材料SAFDPA和SAFCz,对它们结构进行了表征和确认,研究了它们的光物理性能,热稳定性能,并测试了它们作为主体材料用于蓝光和白光OLED器件中,并取得了较好的器件性能。以SAFCz为主体的蓝光和白光器件的最大外量子效率分别达到了19.4%和21.5%。第二部分的研究工作是关于客体材料的,在第三章和第四章分别阐述。众所周知,蓝光PHOLEDs在效率,光色,尤其是在稳定性上都存在许多问题,仍然需要较大的改善才能应用于产业化。所以,我们希望通过对长寿命蓝光客体材料的研究,能够在解决这个世界性难题的进程中做出一些有意义的工作。第三章中,我们合成了新型的稳定的蓝光客体材料(DMIP)3Ir。在1000 cd/m2的亮度下,蓝光和白光器件的半衰减寿命分别达到了446和737小时。第四章中,我们合成了高效率的绿光客体材料(dmpp)2Ir(dpp),并制备了OLED器件。器件的最大发射波长在550 nm,具备较宽的电致发光半峰宽(83 nm),外量子效率达到了22.3%。更重要的是,掺杂浓度降低到3%时仍能够比传统掺杂浓度时具有更好的器件性能。这项工作为低浓度掺杂制备高效磷光OLED提供的可能,这种可能在未来的OLED照明应用方面能够大幅降低成产成本。
[Abstract]:OLED technology has made great progress in the last 30 years since the advent of OLED devices in the late 1980s. Both scientific research and industrial circles have great enthusiasm for OLED technology. Now, the efficiency, photochromism and device life have reached a high level. The stability of high-level OLED materials is still a great challenge for the preparation of long-lived blue-light OLED. In this paper, we will design and synthesize organic materials with different functions based on the efficiency and stability of the devices, with phosphorescent OLED as the main research content and the most important luminescent layer as the focus. Long-lived devices. Materials include high-trilinear host materials, long-lived blue guest materials and high-efficiency green light materials. The first part is about host materials. The second part focuses on the acridine-spirofluorene (SAF) unit, which has been proved to have good exciton transport properties. Fluorene derivatives are also para-linked. However, different functional groups of para-linked fluorene have a great influence on the singlet and triplet states of materials. Derivatives of Fluorene Derivatives at the para-position 4 carbon atom site usually have higher triplet levels. Unfortunately, they are prepared. Two new host materials, SAFDPA and SAFCz, were synthesized by carbon-nitrogen linking of fluorene with diphenylamine and carbazole groups at the C-N sites of fluorene. Their structures were characterized and confirmed. Their photophysical properties, thermal stability and measurements were carried out. The maximum external quantum efficiency of SAFCz-based blue-light and white-light OLED devices is 19.4% and 21.5% respectively. The second part is about the object materials, which are described in Chapter 3 and Chapter 4 respectively. Photo-PHOLEDs have many problems in efficiency, light color, especially in stability, and still need to be improved to be used in industrialization. Therefore, we hope that through the study of long-life blue-light object materials, we can make some meaningful work in the process of solving this worldwide problem. In the third chapter, we synthesized In the fourth chapter, we synthesized the green guest material (dmpp) 2Ir (dpp) with high efficiency and fabricated the OLED device. The maximum emission wavelength of the device is 550 nm. The device has a wide range of electroemission. More importantly, when the doping concentration is reduced to 3%, the device performance can still be better than that of conventional doping concentration. This work provides the possibility of preparing high efficiency phosphorescent OLED with low doping concentration, which may greatly reduce the production cost in future OLED lighting applications.
【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

【相似文献】