蓝光小分子及聚合物铱配合物的合成与性能研究
发布时间：2018-07-15 11:09
【摘要】：有机电致发光二极管(Organic Light-Emitting Diode,简称OLED),因其构造简单,亮度亮,响应速度快,可实现柔性显示等特点而受到广泛的关注和研究。OLED发光材料可以分为荧光材料和磷光材料,荧光材料只能利用单重态激子的激发,根据量子统计规律其理论内量子效率只有25%,而磷光材料可以同时利用单重态和三重态激子的激发,使其理论内量子效率达到100%,所以本文选取磷光材料为研究对象。磷光材料一般是一些重金属配合物,如锇(Os)、铱(Ir)、铂(Pt)等,其中铱配合物因其独特的优势而受到更为广泛的关注。铱配合物根据其分子量或分子结构的不同可以大致分为小分子、聚合物及树状铱配合物,对于这三种铱配合物,红光(30~40 cd/A)和绿光(70~80 cd/A)材料已经达到商业化要求,而蓝光材料,尤其是深蓝色磷光材料,其禁带宽度较大,很难找到与之相匹配的主体材料,所以发展较为滞后。因此,蓝光材料的开发对整个OLED的全彩显示和白光照明等具有很重要的意义。基于此,本文设计了一种空穴传输型的蓝光小分子铱配合物和一系列的蓝光聚合物铱配合物。本论文的内容大致如下:首先,在2-(2,6-二氟吡啶基吡啶)为核的深蓝色磷光铱配合物Ir(dpypy)3的基础上,加入具有空穴传输性质的3-(9H-咔唑基)苯基基团进行修饰,并选取吡啶甲酸作为辅助配体,得到了一种空穴传输性能较好的天蓝光铱配合物(Cz-dpy)2Ir(pic)。对其结构用1H NMR、13C NMR、19F NMR和质谱等方法进行表征,用TGA和DSC对其热稳定性进行研究,测得其Td和Tg分别为262℃和224℃。由循环伏安法测得其HOMO能级为-5.50 eV,与空穴注入层PEDOT:PSS的HOMO能级(-5.20 eV)之间的势垒较小,有利于空穴的注入。将其以8 wt%的浓度掺杂到主体材料mCP和TAPC中得到的器件的启动电压为6.06 V,最大发光亮度和发光效率分别为15573 cd/m2和14.46 cd/A。其次,设计并合成了一系列蓝色聚合物铱配合物PPOCz-2.5、PPOCz-5和PPOCz-10,以聚芳醚型的结构为基础建立的具有高三线态能级(2.83 eV)的双极性蓝色聚合物PPOCz为主链,以著名的蓝色磷光铱配合物FIrpic为侧链的有效设计,有利于聚合物分子内有效地能量传导。聚合物的分子量是通过凝胶渗透色谱法确定的。聚合物的热稳定通过TGA和DSC等方法测定,结果显示Td为323~398℃,Tg为95~120℃。将PPOCz-2.5、PPOCz-5和PPOCz-10单独作为发光层制得器件A、B、C的最大发光效率分别为4.79 cd/A、4.41 cd/A、3.25cd/A,其CIE坐标分别为(0.262,0.493)、(0.251,0.487)、(0.242,0.481),显示了蓝绿色的电致发光性能。
[Abstract]:Organic Light-Emitting Diodes (OLEDs) have attracted extensive attention and research due to their simple structure, bright brightness, fast response speed and flexible display. OLED luminescent materials can be divided into fluorescent and phosphorescent materials. The fluorescence material can only be excited by singlet excitons. According to the quantum statistical law, the quantum efficiency in the theory is only 25 and the phosphorescent material can be excited by both singlet and triplet excitons at the same time. The quantum efficiency is 100, so the phosphorescence material is chosen as the object of study in this paper. Phosphorescent materials are generally some heavy metal complexes such as osmium (Os), iridium (ir), platinum (Pt) and so on. Among them, iridium complexes have attracted more and more attention because of their unique advantages. The iridium complexes can be roughly divided into small molecules, polymers and dendridium complexes according to their molecular weight or molecular structure. For these three iridium complexes, red light (30 ~ 40 cd/A) and green light (70 ~ 80 cd/A) have met commercial requirements. Especially the dark blue phosphorescent material has a large band gap and it is difficult to find the main material matching with it, so the development of the material is lagging behind. Therefore, the development of blue light material is of great significance to the whole OLED color display and white lighting. Based on this, a hole-transport blue light small molecule iridium complex and a series of blue light polymer iridium complexes have been designed. The main contents of this thesis are as follows: firstly, 3- (9H-carbazolyl) phenyl group with hole transport property is added to the ir (dpypy) _ 3 complex, which is a dark blue phosphorescent iridium complex with 2- (2H- (2-difluoropyridyl) pyridine) as nucleus, and is modified by the addition of 3- (9H-carbazolyl) phenyl group with hole transport property. Using pyridinic acid as an auxiliary ligand, a blue iridium complex (Cz-dpy) 2ir (pic). With good hole transport performance was obtained. Its structure was characterized by 1H-NMR-13C-NMR-19F NMR and mass spectrometry, and its thermal stability was studied by TGA and DSC. The Td and TG were found to be 262 鈩，
本文编号：2123867
[Abstract]:Organic Light-Emitting Diodes (OLEDs) have attracted extensive attention and research due to their simple structure, bright brightness, fast response speed and flexible display. OLED luminescent materials can be divided into fluorescent and phosphorescent materials. The fluorescence material can only be excited by singlet excitons. According to the quantum statistical law, the quantum efficiency in the theory is only 25 and the phosphorescent material can be excited by both singlet and triplet excitons at the same time. The quantum efficiency is 100, so the phosphorescence material is chosen as the object of study in this paper. Phosphorescent materials are generally some heavy metal complexes such as osmium (Os), iridium (ir), platinum (Pt) and so on. Among them, iridium complexes have attracted more and more attention because of their unique advantages. The iridium complexes can be roughly divided into small molecules, polymers and dendridium complexes according to their molecular weight or molecular structure. For these three iridium complexes, red light (30 ~ 40 cd/A) and green light (70 ~ 80 cd/A) have met commercial requirements. Especially the dark blue phosphorescent material has a large band gap and it is difficult to find the main material matching with it, so the development of the material is lagging behind. Therefore, the development of blue light material is of great significance to the whole OLED color display and white lighting. Based on this, a hole-transport blue light small molecule iridium complex and a series of blue light polymer iridium complexes have been designed. The main contents of this thesis are as follows: firstly, 3- (9H-carbazolyl) phenyl group with hole transport property is added to the ir (dpypy) _ 3 complex, which is a dark blue phosphorescent iridium complex with 2- (2H- (2-difluoropyridyl) pyridine) as nucleus, and is modified by the addition of 3- (9H-carbazolyl) phenyl group with hole transport property. Using pyridinic acid as an auxiliary ligand, a blue iridium complex (Cz-dpy) 2ir (pic). With good hole transport performance was obtained. Its structure was characterized by 1H-NMR-13C-NMR-19F NMR and mass spectrometry, and its thermal stability was studied by TGA and DSC. The Td and TG were found to be 262 鈩，
本文编号：2123867
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