發(fā)布時(shí)間：2018-01-19 00:26

  本文關(guān)鍵詞： 咔唑 氰基吡啶 三唑 雙偶極主體材料 有機(jī)電致發(fā)光　出處：《大連理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：由于具有驅(qū)動(dòng)電壓低,功耗小,對比度高,主動(dòng)發(fā)光,質(zhì)輕體薄,可柔性顯示等諸多優(yōu)點(diǎn),有機(jī)電致發(fā)光二極管(OLEDs)逐漸發(fā)展成新一代平板顯示技術(shù)中最有力的競爭者,廣泛應(yīng)用于電視、手機(jī)和可穿戴設(shè)備等諸多電子產(chǎn)品上。在OLEDs所有的功能層中,發(fā)光層是最核心的部分,因此這一層材料的結(jié)構(gòu)設(shè)計(jì)至關(guān)重要。目前,幾乎所有的有機(jī)電致發(fā)光器件(包括熒光器件和磷光器件),其發(fā)光層均采用主-客體摻雜型的器件結(jié)構(gòu)。雙偶極主體材料因?yàn)橥瑫r(shí)具備電子和空穴的傳輸能力,使發(fā)光層中的載流子傳輸更加平衡,能夠大幅度提高器件的發(fā)光效率,因此是發(fā)光層主體材料的最佳選擇。咔唑及其衍生物具有優(yōu)秀的空穴傳輸能力,而且其自身三線態(tài)能級較高,作為優(yōu)良的P型傳輸基團(tuán),廣泛用于空穴傳輸材料上。三唑類化合物、含氰基的化合物和吡啶衍生物等是具有較好的電子傳輸能力,它們作為優(yōu)良的N型傳輸基團(tuán),被用于電子傳輸材料。本論文選用咔唑?yàn)榭昭▊鬏敾鶊F(tuán),氰基吡啶及三唑?yàn)殡娮觽鬏敾鶊F(tuán),設(shè)計(jì)并合成了七個(gè)雙偶極主體材料m-CzPyCN、n-CzPyCN、o-CzPyCN、t-CzPyCN、DzSCz、DzDCz和SzDCz。為了保證目標(biāo)分子具有較高的三線態(tài)能級,本文利用常規(guī)的分子設(shè)計(jì)方法,即利用間位取代和鄰位取代具有較大的空間位阻效應(yīng),縮短分子的共軛長度,使得分子的donor與acceptor空間分離,設(shè)計(jì)合成了氰基吡啶系列和三唑系列共7個(gè)雙偶極分子。利用帶邊吸收和循環(huán)伏安相結(jié)合的方法,計(jì)算并得到分子的HOMO與LUMO能級,利用Gauss03計(jì)算分子軌道的空間分布情況并以此為基礎(chǔ)優(yōu)化分子空間結(jié)構(gòu)。計(jì)算結(jié)果顯示,在這些分子中HOMO跟LUM O基本完全分離,三線態(tài)能級較高,適合做綠光和藍(lán)光的主體材料。以氰基吡啶系列材料做Ir(ppy)3的主體,三唑系列材料做FIrpic的主體,制備了有機(jī)電致發(fā)光器件,研究了這些雙偶極主體材料的電致發(fā)光性能。結(jié)果顯示,以氰基毗啶系列為主體材料制備的摻雜型綠光材料器件中,o-CzPyCN表現(xiàn)出最優(yōu)異的性能,最大電流效率高達(dá)60 cd/A,比相同器件結(jié)構(gòu)的間位取代主體材料m-CzPyCN的電流效率高一倍；三唑系列摻雜藍(lán)光材料器件中,SzDCz表現(xiàn)出最優(yōu)異的性能,其效率分別為27.8 cd/A,21.9 lm/W和12.9%,結(jié)果表明在雙偶極主體材料設(shè)計(jì)中要根據(jù)電子傳輸基團(tuán)和空穴傳輸基團(tuán)的傳輸性能,合理調(diào)節(jié)它們的比例才能得到最佳性能的主體材料。
[Abstract]:It has many advantages, such as low driving voltage, low power consumption, high contrast, active luminescence, thin body weight, flexible display and so on. Organic light-emitting diodes (OLEDs) have gradually developed into the most powerful competitors in the new generation of flat panel display technology, widely used in television. The luminous layer is the core of all the OLEDs functional layers, so the structural design of this layer is crucial. Almost all organic electroluminescent devices (including fluorescent devices and phosphorescence devices). The photoluminescence layer is both host-guest doped device structure. Because of the transmission ability of electron and hole, the carrier transport in the luminescent layer is more balanced. Carbazole and its derivatives have excellent hole transport ability and their three-wire energy levels are higher. As an excellent P-type transport group, it is widely used in hole transport materials. Triazole compounds, cyano-containing compounds and pyridine derivatives have good electron transport ability. In this paper, carbazole was selected as the hole transport group, and cyanopyridine and triazole were selected as electron transport groups. Seven dipolar host materials m-CzPyCNN n-CzPyCNN + -PyCNT-PyCNT-PyCNT-DzSCz were designed and synthesized. DzDCz and SzDCz. in order to ensure that the target molecule has a higher three-line energy level, this paper uses the conventional molecular design method, that is, the use of interposition substitution and adjacent substitution has a larger steric resistance effect. The conjugate length of the molecule is shortened so that the donor of the molecule is separated from the acceptor space. Seven dipolar molecules of cyanopyridine series and triazole series were designed and synthesized. The HOMO and LUMO levels of the molecules were calculated and obtained by the method of band edge absorption and cyclic voltammetry. The spatial distribution of molecular orbitals is calculated by Gauss03 and the molecular spatial structure is optimized. The results show that HOMO and LUM O are completely separated in these molecules. The three-wire state is suitable for green and blue light materials, cyanopyridine series materials as the main body of Ir(ppy)3, triazole series materials as the main body of FIrpic. Organic electroluminescent devices (OLEDs) were prepared and their electroluminescent properties were studied. O-CzPyCN has the best performance, the maximum current efficiency is as high as 60 CD / A, which is twice as high as that of m-CzPyCN, which is the main substitute material of the same device structure. SzDCz exhibits the best performance in triazole doped blue-light devices, with efficiencies of 27.8 cd/ An 21.9 lm/W and 12.9% respectively. The results show that according to the transmission performance of the electron transport group and the hole transport group, the optimum performance of the host material can be obtained by adjusting their proportion in the design of the bipolar host material.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN383.1

【共引文獻(xiàn)】

相關(guān)期刊論文 前2條

1 段煉;邱勇;;有機(jī)發(fā)光材料與器件研究進(jìn)展[J];材料研究學(xué)報(bào);2015年05期

2 安眾福;肖堅(jiān)堅(jiān);汪洋;陳潤鋒;陳婷;鄭超;黃維;;二苯基氧磷修飾的不對稱三嗪主體材料的理論研究[J];南京郵電大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年02期

相關(guān)博士學(xué)位論文 前5條

1 劉賀;基于四苯基硅烷的寬禁帶半導(dǎo)體材料的設(shè)計(jì)合成與光電性能研究[D];吉林大學(xué);2014年

2 葉華;具有電荷傳輸特性的有機(jī)功能材料的合成及其光電性能[D];華南理工大學(xué);2014年

3 穆廣園;遷移率可調(diào)電子傳輸與主體材料的合成及其性能研究[D];華中科技大學(xué);2014年

4 趙吟屏;藍(lán)色磷光銥配合物的設(shè)計(jì)合成與光電性質(zhì)研究[D];吉林大學(xué);2015年

5 陳棟;多功能含氟鈹配合物電致發(fā)光材料的性質(zhì)研究[D];吉林大學(xué);2015年

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本文編號：1441857