發(fā)布時(shí)間：2018-07-15 11:09

【摘要】：有機(jī)電致發(fā)光二極管(Organic Light-Emitting Diode,簡稱OLED),因其構(gòu)造簡單,亮度亮,響應(yīng)速度快,可實(shí)現(xiàn)柔性顯示等特點(diǎn)而受到廣泛的關(guān)注和研究。OLED發(fā)光材料可以分為熒光材料和磷光材料,熒光材料只能利用單重態(tài)激子的激發(fā),根據(jù)量子統(tǒng)計(jì)規(guī)律其理論內(nèi)量子效率只有25%,而磷光材料可以同時(shí)利用單重態(tài)和三重態(tài)激子的激發(fā),使其理論內(nèi)量子效率達(dá)到100%,所以本文選取磷光材料為研究對(duì)象。磷光材料一般是一些重金屬配合物,如鋨(Os)、銥(Ir)、鉑(Pt)等,其中銥配合物因其獨(dú)特的優(yōu)勢而受到更為廣泛的關(guān)注。銥配合物根據(jù)其分子量或分子結(jié)構(gòu)的不同可以大致分為小分子、聚合物及樹狀銥配合物,對(duì)于這三種銥配合物,紅光(30~40 cd/A)和綠光(70~80 cd/A)材料已經(jīng)達(dá)到商業(yè)化要求,而藍(lán)光材料,尤其是深藍(lán)色磷光材料,其禁帶寬度較大,很難找到與之相匹配的主體材料,所以發(fā)展較為滯后。因此,藍(lán)光材料的開發(fā)對(duì)整個(gè)OLED的全彩顯示和白光照明等具有很重要的意義�；诖�,本文設(shè)計(jì)了一種空穴傳輸型的藍(lán)光小分子銥配合物和一系列的藍(lán)光聚合物銥配合物。本論文的內(nèi)容大致如下:首先,在2-(2,6-二氟吡啶基吡啶)為核的深藍(lán)色磷光銥配合物Ir(dpypy)3的基礎(chǔ)上,加入具有空穴傳輸性質(zhì)的3-(9H-咔唑基)苯基基團(tuán)進(jìn)行修飾,并選取吡啶甲酸作為輔助配體,得到了一種空穴傳輸性能較好的天藍(lán)光銥配合物(Cz-dpy)2Ir(pic)。對(duì)其結(jié)構(gòu)用1H NMR、13C NMR、19F NMR和質(zhì)譜等方法進(jìn)行表征,用TGA和DSC對(duì)其熱穩(wěn)定性進(jìn)行研究,測得其Td和Tg分別為262℃和224℃。由循環(huán)伏安法測得其HOMO能級(jí)為-5.50 eV,與空穴注入層PEDOT:PSS的HOMO能級(jí)(-5.20 eV)之間的勢壘較小,有利于空穴的注入。將其以8 wt%的濃度摻雜到主體材料mCP和TAPC中得到的器件的啟動(dòng)電壓為6.06 V,最大發(fā)光亮度和發(fā)光效率分別為15573 cd/m2和14.46 cd/A。其次,設(shè)計(jì)并合成了一系列藍(lán)色聚合物銥配合物PPOCz-2.5、PPOCz-5和PPOCz-10,以聚芳醚型的結(jié)構(gòu)為基礎(chǔ)建立的具有高三線態(tài)能級(jí)(2.83 eV)的雙極性藍(lán)色聚合物PPOCz為主鏈,以著名的藍(lán)色磷光銥配合物FIrpic為側(cè)鏈的有效設(shè)計(jì),有利于聚合物分子內(nèi)有效地能量傳導(dǎo)。聚合物的分子量是通過凝膠滲透色譜法確定的。聚合物的熱穩(wěn)定通過TGA和DSC等方法測定,結(jié)果顯示Td為323~398℃,Tg為95~120℃。將PPOCz-2.5、PPOCz-5和PPOCz-10單獨(dú)作為發(fā)光層制得器件A、B、C的最大發(fā)光效率分別為4.79 cd/A、4.41 cd/A、3.25cd/A,其CIE坐標(biāo)分別為(0.262,0.493)、(0.251,0.487)、(0.242,0.481),顯示了藍(lán)綠色的電致發(fā)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，

本文編號(hào)：2123867