基于新型螺芴衍生物主体的高效蓝光有机发光二极管

发布时间：2018-11-14 13:13

【摘要】：近些年来,有机发光二极管(OLED)因其响应速度快、无需背光源和能够实现柔性弯曲等诸多优点而备受关注。目前,OLED全彩显示及固态照明已经应用到了我们实际生活中。但是,由于蓝光磷光客体的三线态能级较高,具有高三线态能级主体材料的匮乏造成了目前蓝光OLED性能较差的现象,进而影响了OLED的整体发展进程。目前用于提升蓝光OLED性能的方法有发展新的主体材料和改善器件结构两大类。其中,因可以从根源上解决器件性能差的问题,发展新的主体材料是目前效果最明显,也是最常用的改善OLED器件性能的方法。本课题中,以金属钯为催化剂,通过偶联反应,我们首先合成了一种新的螺二芴衍生物材料PF-SBF。然后在对PF-SBF进行了一系列的表征后,以其为发光材料和主体材料制备了多类蓝光OLED。具体如下:(1)分别以PF-SBF作发光材料和单主体材料制备了两类简单的OLED,但两类器件的性能均不尽如人意;(2)利用空穴传输材料TAPC与PF-SBF作双主体,对结构进行优化后制备的蓝光OLED的最大亮度和最大电流效率分别为7857 cd/m2和16.70 cd/A;(3)以TAPC和PF-SBF作双主体,采用类似结构制备的绿光OLED的最大亮度和最大电流效率分别高达23390 cd/m2和50.50 cd/A。虽然经过优化,基于PF-SBF主体的蓝光OLED在性能上得到了很大程度的提升,但是由于PF-SBF三线态能级较低,此蓝光器件的性能只能算是差强人意。为进一步获得性能更高的蓝光器件,在PF-SBF的基础上,我们以类似的方法合成了一系列三线态能级更高的螺芴氧杂蒽衍生物PF-SFX、C8OPF-SFX、C8OPF-SFX-C8OPF和4C8OPF-SFX,并分别以其为主体制备了多类蓝光OLED。具体如下:(1)以PF-SFX作单主体制备的简单蓝光OLED展现出了启亮电压、最大亮度和最大电流效率分别为6.80 V、3247 cd/m2和8.74 cd/A的性能;(2)采用与TAPC:PF-SBF作双主体体系的相似结构,将PF-SBF替换成PF-SFX、C8OPF-SFX、C8OPF-SFX-C8OPF和4C8OPF-SFX时,蓝光器件的最大电流效率分别达到了22.56、25.93、19.06和19.43 cd/A,最大亮度分别为6421、6196、5806和2257 cd/m2。研究结果表明,打断碳碳键并引入氧后可以增大主体的三线态能级,与常用的磷光客体三线态能级更加匹配,大幅提升了蓝光发光效率。
[Abstract]:In recent years, organic light-emitting diode (OLED) has attracted much attention because of its high response speed, no backlight and flexible bending. At present, OLED full-color display and solid-state lighting have been applied to our real life. However, due to the high three-wire energy level of the blue photoluminescence guest, the lack of the host material with the high three-line state results in the poor performance of the blue OLED, which affects the overall development of OLED. At present, there are two methods to improve the performance of Blu-ray OLED: to develop new main materials and to improve device structure. The development of new main materials is the most effective and the most commonly used method to improve the performance of OLED devices. In this paper, a new spirodifluorene derivative material, PF-SBF., was synthesized by coupling reaction with palladium as catalyst. Then, after a series of characterization of PF-SBF, a series of blue light OLED. was prepared using it as luminescent material and host material. The main contents are as follows: (1) two kinds of simple OLED, have been prepared by using PF-SBF as luminescent material and single host material respectively, but the performance of the two kinds of devices is not satisfactory; (2) the maximum brightness and current efficiency of blue light OLED prepared by optimizing the structure of TAPC and PF-SBF were 7857 cd/m2 and 16.70 cd/A;, respectively. (3) the maximum brightness and current efficiency of green light OLED prepared by using TAPC and PF-SBF as double main body are as high as 23390 cd/m2 and 50.50 cd/A., respectively. Although the performance of Blu-ray OLED based on PF-SBF has been greatly improved after optimization, the performance of this blue-ray device can only be considered as unsatisfactory because of the low three-wire energy level of PF-SBF. In order to obtain higher performance blue light devices, we synthesized a series of spirofluorene oxyanthracene derivatives PF-SFX,C8OPF-SFX-C8OPF and 4C8OPF-SFX in a similar way based on PF-SBF. The blue light OLED. was prepared by using it as the main body. The main results are as follows: (1) A simple blue light OLED with PF-SFX as a single main body shows the performance of the turn-on voltage, the maximum brightness and the maximum current efficiency are 6.80 Vt 3247 cd/m2 and 8.74 cd/A, respectively; (2) when the PF-SBF is replaced by PF-SFX,C8OPF-SFX-C8OPF and 4C8OPF-SFX by using a similar structure to TAPC:PF-SBF as a two-body system, The maximum current efficiency of blue light devices is 22.56U 25.93C 19.06 and 19.43 cd/A, respectively, and the maximum luminance is 6421C 6196C 5806 and 2257 cd/m2., respectively. The results show that breaking the carbon-carbon bond and introducing oxygen can increase the three-wire energy level of the host, which is more consistent with the commonly used three-wire energy level of the phosphorescence guest, and greatly improves the blue luminescence efficiency.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN383.1

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