【摘要】：有機(jī)電致發(fā)光技術(shù)作為新一代顯示技術(shù),近些年來(lái)受到廣泛關(guān)注,經(jīng)過(guò)科研工作者和企業(yè)研發(fā)的不懈努力,已進(jìn)入初步產(chǎn)業(yè)化階段。在平面顯示方面,有機(jī)電致發(fā)光器件(OLEDs)因其特有的優(yōu)勢(shì)在應(yīng)用上凸顯出很強(qiáng)的競(jìng)爭(zhēng)力,但作為顯示三基色(藍(lán)、綠、紅)之一的藍(lán)光器件在性能上仍與其它兩個(gè)光色有一定差距。尤其是可作為高質(zhì)量顯示的深藍(lán)光器件的發(fā)展始終未能取得實(shí)質(zhì)性突破,無(wú)論是在器件效率還是壽命方面都不能令人滿意。目前藍(lán)光器件存在的主要問(wèn)題有:效率不夠高、光色不理想、在高亮度下的效率衰減相對(duì)嚴(yán)重,因此,本文主要針對(duì)以上問(wèn)題進(jìn)行研究。在分子設(shè)計(jì)方面,我們選擇具有雙極性傳輸潛力的咪唑環(huán)作為核心,衍生出菲并咪唑和芘并咪唑兩種高效藍(lán)光構(gòu)筑基團(tuán),通過(guò)合理的分子設(shè)計(jì)調(diào)節(jié)材料的激發(fā)態(tài)性質(zhì),以獲得更高的發(fā)光效率和更加飽和的發(fā)光顏色。在電致發(fā)光器件方面,通過(guò)系統(tǒng)的結(jié)構(gòu)優(yōu)化實(shí)現(xiàn)最大化的器件性能,并根據(jù)各材料在器件中的表現(xiàn)來(lái)更加深入地了解其光電性質(zhì)。除研究這些材料在常規(guī)非摻雜和摻雜器件中的光電性能外,我們還嘗試性地采用具有相似分子結(jié)構(gòu)的材料構(gòu)成主-客體系,這種獨(dú)特的體系展現(xiàn)出了比常規(guī)體系更加優(yōu)秀的器件性能,為最終能實(shí)現(xiàn)穩(wěn)定高效的藍(lán)光OLED提供了新的思路。本文主要包含四部分內(nèi)容:1.對(duì)一系列經(jīng)典的用于OLED制備的功能材料進(jìn)行基本光物理和電化學(xué)性質(zhì)表征,從中選擇適合用于藍(lán)光器件制備的材料。優(yōu)化器件的載流子注入結(jié)構(gòu),改進(jìn)器件制備工藝,為下面獲得高性能藍(lán)光OLED做準(zhǔn)備。2.以二苯并噻吩為中心橋,在其3,6-位橋連兩個(gè)菲并咪唑基團(tuán),構(gòu)成雙枝菲并咪唑衍生物,再通過(guò)改變中心硫原子的氧化態(tài)來(lái)調(diào)節(jié)中心橋的電子密度,合成出兩個(gè)激發(fā)態(tài)性質(zhì)不同的分子。它們?cè)贠LED應(yīng)用中表現(xiàn)良好,并在二者構(gòu)成的主-客體系的摻雜器件中展現(xiàn)出了略優(yōu)于常規(guī)摻雜體系的器件性能。3.細(xì)致探究蒽和芘取代的菲并咪唑和芘并咪唑衍生物的電致發(fā)光性能,通過(guò)觀察器件光電特性曲線的行為,可以推斷出這些材料都具備TTA性質(zhì),其中PIMPy的非摻雜器件表現(xiàn)出純藍(lán)發(fā)射,CIE坐標(biāo)(0.154,0.140),在300~3000 cd cm~(-2)的亮度區(qū)間內(nèi)的外量子效率維持在5~5.11%。利用PIMPy為主體,Py IPy為客體,制備的摻雜器件的最大亮度超過(guò)了100000cd cm~(-2),最大外量子效率達(dá)到7.13%,且亮度超過(guò)100 cd cm~(-2)時(shí)可保持大于5%的外量子效率。4.設(shè)計(jì)并合成了萘取代的菲并咪唑和芘并咪唑高效深藍(lán)光材料,并表現(xiàn)出非常平衡的載流子傳輸性質(zhì)。兩個(gè)材料的非摻雜OLED均表現(xiàn)出穩(wěn)定的深藍(lán)光發(fā)射和極弱的效率滾降,利用PIMNA作為主體,Py INA作為客體,制備的摻雜器件最大外量子效率達(dá)到5.05%,CIE色坐標(biāo)為(0.156,0.060),最大亮度13600 cd cm~(-2),同時(shí)效率相對(duì)穩(wěn)定,在1000 cd cm~(-2)的亮度下外量子效率為4.67%,這在已報(bào)道的CIE坐標(biāo)接近EBU的標(biāo)準(zhǔn)藍(lán)光的器件中,處于國(guó)際領(lǐng)先水平。
[Abstract]:Organic electroluminescent devices (OLEDs), as a new generation of display technology, have attracted wide attention in recent years. Through the unremitting efforts of scientific researchers and enterprises, they have entered the initial stage of industrialization. In the aspect of flat display, organic electroluminescent devices (OLEDs) have shown strong competitiveness in application because of their unique advantages, but as a display three. One of the basic colors (blue, green, red) is still far from the other two in terms of performance. Especially, the development of dark blue light devices which can be used as high-quality displays has not made a substantial breakthrough, both in terms of device efficiency and lifetime are unsatisfactory. In the aspect of molecular design, we choose the imidazole ring with bipolar transmission potential as the core, and derive two high-efficiency blue-light building groups, phenamidazole and pyrene imidazole, through reasonable molecular design. In order to obtain higher luminous efficiency and more saturated color, the excited state properties of the materials are adjusted. In electroluminescent devices, the device performance is maximized by systematic structural optimization, and the photoelectric properties are further understood according to the performance of the materials in the devices. In addition to the optoelectronic properties of doped devices, we also attempt to use materials with similar molecular structures to form host-guest systems. This unique system exhibits better device performance than conventional systems, providing a new idea for achieving stable and efficient blue-light OLED. A series of classical functional materials for OLED fabrication are characterized by their basic photophysical and electrochemical properties, from which materials suitable for the preparation of blue light devices are selected. Carrier injection structure of devices is optimized, and the fabrication process is improved to prepare for the following high performance blue light OLED. 2. Dibenzothiophene is used as the central bridge and its 3,6-position bridge is used. Two molecules with different properties of excited states were synthesized by changing the oxidation state of central sulfur atom to adjust the electron density of the central bridge. They performed well in OLED applications and showed slightly superior performance in host-guest doping devices. The electroluminescent properties of anthracene and pyrene substituted phenamidazole and pyrene substituted phenamidazole derivatives were investigated in detail. By observing the behavior of the photoelectric characteristic curves, the TTA properties of these materials were deduced. Among them, the PIMPy non-doped devices exhibited pure blue emission, CIE coordinates (0.154, 0.140), 300-3000 cd. The external quantum efficiency of the doped device is maintained at 5-5.11% in the luminance range of cm~(-2). Using PIMPy as the main body and Py IPy as the object, the maximum luminance of the doped device exceeds 100 000 CD cm~(-2), the maximum external quantum efficiency is 7.13%, and the external quantum efficiency can be maintained at more than 5% when the luminance exceeds 100 CD cm~(-2). 4. Naphthalene substituted phenanthrene is designed and synthesized. Imidazole and pyrene-imidazole high-efficiency dark blue light-emitting materials exhibit very balanced carrier transport properties. Undoped OLEDs of both materials exhibit stable deep blue light emission and very weak efficiency roll-off. Using PIMNA as the host and Py-INA as the guest, the maximum external quantum efficiency of doped devices is 5.05% and the CIE color coordinate is (0.156). The external quantum efficiency is 4.67% at the brightness of 1000 CD cm ~(-2), which is in the leading position in the world among the reported devices whose CIE coordinates are close to EBU standard blue light.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ422

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