本文選題：OLED + 疊層��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：有機(jī)電致發(fā)光器件(Organic Light-Emitting Device，簡(jiǎn)稱(chēng)OLED)，在科技快速發(fā)展的今天，一直不斷地在進(jìn)步，尤其在新一代平板顯示技術(shù)和固態(tài)照明兩大領(lǐng)域嶄露頭角，并日趨完善和穩(wěn)定。疊層白光有機(jī)電致發(fā)光器件(Tandem WhiteTandem Organic Light-Emitting Device，簡(jiǎn)稱(chēng)Tandem WOLED)將兩個(gè)或兩個(gè)以上單獨(dú)的有機(jī)電致發(fā)光單元，依照互補(bǔ)色原則，通過(guò)中間連接層串聯(lián)在一起組成發(fā)白光的器件。疊層器件具有亮度高、低功耗、壽命長(zhǎng)、色坐標(biāo)穩(wěn)定等優(yōu)點(diǎn)，對(duì)未來(lái)白光照明有很大的應(yīng)用前景。 疊層OLED的中間連接層(或電荷生成層)不僅具有連接各個(gè)發(fā)光單元的作用，還負(fù)責(zé)電荷的生成、傳輸以及載流子注入到各發(fā)光單元�？梢�(jiàn)，中間連接層對(duì)疊層OLED至關(guān)重要。因此，中間連接層的設(shè)計(jì)與優(yōu)化也成為了對(duì)疊層OLED研究工作的重要部分。 本論文根據(jù)以上思路，基于新型中間連接層的疊層白光有機(jī)電致發(fā)光器件展開(kāi)研究，目的是為了設(shè)計(jì)出新型的中間連接層，不僅能夠保證疊層器件的高性能，而且能夠使疊層器件的整體結(jié)構(gòu)和中間連接層的結(jié)構(gòu)都得到優(yōu)化。具體開(kāi)展了以下工作： 首先，采用真空熱蒸鍍方法制備了單色OLED。制備了三組器件，第一組對(duì)不同電子傳輸層的黃光OLED進(jìn)行比較，發(fā)現(xiàn)電子傳輸層中含有Bphen的器件表現(xiàn)出明顯高的電流密度和更高的效率，得出結(jié)論：當(dāng)金屬Ag分別沉積到三種電子傳輸層Bphen、TmPyPB和TpPyPB上時(shí)，Ag會(huì)分別擴(kuò)散到這三種有機(jī)材料中，但是Ag只與Bphen發(fā)生反應(yīng)并生產(chǎn)新物質(zhì)，提高了電子從Ag向Bphen中的注入，降低開(kāi)啟電壓，從而提高器件效率，而Ag不會(huì)與TmPyPB和TpPyPB發(fā)生任何反應(yīng)。也就是說(shuō)，對(duì)電子傳輸層Bphen來(lái)說(shuō)Ag才有效。 第二組是以Ag為陰極、Bphen為電子傳輸層的綠光OLED，Bphen的厚度不同，金屬Ag與發(fā)光層Alq3之間嵌入的Bphen能夠明顯提高陰極電子的注入，使器件電流密度隨電壓升高而增大，但是如果Bphen太薄，器件在低電壓下會(huì)出現(xiàn)負(fù)阻效應(yīng)，只有當(dāng)Bphen厚度達(dá)到5nm時(shí)，，負(fù)阻效應(yīng)才會(huì)消失。得出結(jié)論：金屬Ag沉積到電子傳輸層Bphen的擴(kuò)散長(zhǎng)度約為5nm。 第三組以Ag和Mg：Ag分別為陰極的黃光OLED，證明了以Ag為陰極的OLED可與以Mg： Ag合金為陰極的OLED性能媲美，金屬Ag作為陰極材料，有效的提高了電子的注入，而且陰極Ag不需要任何修飾層，如LiF、堿金屬及其化合物、V2O5等，同時(shí)Ag結(jié)構(gòu)簡(jiǎn)單，易于操作。因此，我們得出結(jié)論：Ag是一種很好的陰極材料。 接下來(lái)，在以Ag為陰極的單色OLED的基礎(chǔ)上，設(shè)計(jì)將金屬Ag同時(shí)作為陰極和中間連接層應(yīng)用到Tandem WOLED，同沒(méi)有Ag作為中間連接層的疊層器件相比，Ag促進(jìn)了電子注入，明顯提高了器件電流密度，說(shuō)明Ag是一種性能良好的中間連接層材料；再比較不同的電子傳輸層，對(duì)應(yīng)薄層金屬Ag作為中間連接層， Bphen較其它材料有更大的優(yōu)勢(shì)；從Tandem WOLED自身結(jié)構(gòu)的特征出發(fā)，驗(yàn)證上下發(fā)光層的順序，藍(lán)光發(fā)光單元靠近ITO陽(yáng)極、黃光發(fā)光單元靠近陰極Ag，發(fā)出的白光性能最穩(wěn)定；對(duì)器件的電子傳輸層Bphen的厚度加以?xún)?yōu)化，當(dāng)厚度增大時(shí)，電流密度和亮度變化不大，但是效率有明顯提高，使優(yōu)化后的Tandem具有開(kāi)啟電壓低、功率效率低、功率效率高、色坐標(biāo)穩(wěn)定、且結(jié)構(gòu)簡(jiǎn)化的優(yōu)勢(shì)，充分利用了金屬Ag與有機(jī)材料Bphen的特殊性質(zhì)。 最后，基于前面的研究結(jié)論，由于Ag的功函數(shù)的限制，盡管是以Bphen為電子傳輸層，其電子注入仍然會(huì)受到一定的限制，并且也限制了電子傳輸層的選擇范圍，因而我們將常用于OLED陰極的Mg：Ag合金作為疊層器件的內(nèi)部連接層，研究Mg：Ag合金的比例、及其不同的電子傳輸層等對(duì)疊層WOLED性能的影響。不同濃度比的Mg：Ag與Ag進(jìn)行比較，因?yàn)镸g的功函數(shù)較低，摻入功函數(shù)較高的Ag，合金同樣適合作為疊層器件的中間連接層，甚至有優(yōu)于Ag的表現(xiàn)；以Mg：Ag為中間連接層的Tandem WOLED，可以在除了Bphen以外的電子傳輸層中發(fā)揮作用，提高器件效率。 綜上所述，本論文設(shè)計(jì)并不斷優(yōu)化了Tandem WOLED的中間連接層，將金屬Ag和合金Mg：Ag應(yīng)用為中間連接層，既簡(jiǎn)化了器件結(jié)構(gòu)，又保證了器件的優(yōu)良性能，Tandem WOLED表現(xiàn)為低驅(qū)動(dòng)電壓、高功率效率和低效率滾降。
[Abstract]:Organic Light - Emitting Device ( OLED ) has been making progress in the rapid development of science and technology , especially in the new generation of flat panel display technology and solid state lighting .

the intermediate connection layer ( or charge generation layer ) of the laminated oled has not only the function of connecting the individual light - emitting units but also the generation , transmission and carrier injection of charge into the light - emitting units .

In order to design a novel middle connecting layer , we can not only guarantee the high performance of the laminated device , but also optimize the whole structure of the laminated device and the structure of the middle connecting layer . The following work is carried out :

The results show that when the metal Ag is deposited on the three electron transport layers Bphen , TmPyPB and TpPyPB , the Ag can diffuse into the three kinds of organic materials , but Ag only reacts with Bphen and produces new substances , which improves the efficiency of the device , and Ag does not react with TmPyPB and TpPyPB . In other words , Ag is only effective for the electron transport layer Bphen .

The second group is the green OLED with Ag as the cathode and Bphen as the electron transport layer . Bphen embedded in the metal Ag and the light - emitting layer Alq3 can obviously improve the electron injection of the cathode , so that the current density of the device increases with the increase of the voltage , but if the Bphen is too thin , the negative resistance effect appears only when the thickness of the Bphen is 5 nm . The conclusion is that the diffusion length of the metal Ag to the electron transport layer Bphen is about 5 nm .

In the third group , Ag and Mg : Ag , respectively , are yellow light OLEDs , which show that the OLED with Ag as cathode is comparable with OLED with Mg : Ag alloy as cathode . As cathode material , Ag can effectively improve electron injection , and Ag does not need any modification layer , such as LiF , alkali metal and its compound , V2O5 , etc . , Ag has simple structure and easy operation . Therefore , it is concluded that Ag is a good cathode material .

Next , on the basis of a single - color OLED using Ag as the cathode , the metal Ag is designed to be applied as a cathode and an intermediate connecting layer to Tandem WOLEDs , and the Ag promotes electron injection compared with a laminated device without Ag as an intermediate connection layer , so that the current density of the device is obviously improved , and the Ag is a middle connecting layer material with good performance ;
Compared with other materials , Bphen has more advantages than other materials by comparing different electron transport layers , and the corresponding thin layer metal Ag is used as the intermediate connecting layer ;
According to the characteristics of the tandem WOLED self structure , the sequence of the upper and lower light emitting layers is verified , the blue light emitting unit is close to the ITO anode , the yellow light emitting unit is close to the cathode Ag , and the white light performance is most stable ;
the thickness of the electron transport layer Bphen of the device is optimized , when the thickness is increased , the current density and the brightness change are not large , but the efficiency is obviously improved , so that the optimized Tandem has the advantages of low opening voltage , low power efficiency , high power efficiency , stable color coordinates and simplified structure , and the special property of the metal Ag and the organic material Bphen is fully utilized .

At last , based on the previous research conclusions , because of the limitation of the work function of Ag , the electron injection is still limited by the Bphen as the electron transport layer , and the choice range of the electron transport layer is also limited . The Mg : Ag alloy used in the cathode of the OLED is used as the internal connection layer of the laminated device .
Tandem WOLEDs with Mg : Ag as the intermediate connection layer can play a role in the electron transport layer other than Bphen , and improve the device efficiency .

In conclusion , the paper designs and continuously optimizes the middle connecting layer of Tandem WOLED , and applies the metal Ag and the alloy Mg : Ag as the intermediate connecting layer , which not only simplifies the structure of the device , but also ensures the excellent performance of the device , and the Tandem WOLED shows low driving voltage , high power efficiency and low efficiency roll - down .
【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】：2015
【分類(lèi)號(hào)】：TN383.1

【共引文獻(xiàn)】

相關(guān)博士學(xué)位論文 前5條

1 鄧艷紅;電荷產(chǎn)生層對(duì)疊層有機(jī)發(fā)光器件性能影響的研究[D];蘇州大學(xué);2014年

2 魏懷鑫;有機(jī)光電器件的界面特性研究[D];蘇州大學(xué);2014年

3 馮雪飛;金屬/有機(jī)界面結(jié)構(gòu)及其與有機(jī)電子和光電器件性能間關(guān)系的研究[D];中國(guó)科學(xué)技術(shù)大學(xué);2014年

4 彭麗萍;異價(jià)摻雜TiO_2的電子結(jié)構(gòu)和光學(xué)及熱電性能研究[D];華中科技大學(xué);2014年

5 張志坤;石墨襯底半導(dǎo)體ZnO和SiC材料生長(zhǎng)研究[D];大連理工大學(xué);2014年

相關(guān)碩士學(xué)位論文 前5條

1 張鈺磊;OLED驅(qū)動(dòng)電路的研究與設(shè)計(jì)[D];蘭州交通大學(xué);2013年

2 劉明偉;CoPc在Au（111）表面吸附的結(jié)構(gòu)和電子態(tài)研究[D];浙江大學(xué);2013年

3 王琦;基于新型銥配合物的有機(jī)電致發(fā)光器件及其特性研究[D];電子科技大學(xué);2013年

4 畢文濤;利用載流子產(chǎn)生層提高串聯(lián)式有機(jī)電致發(fā)光器件性能的研究[D];天津理工大學(xué);2013年

5 肖志慧;采用串聯(lián)式結(jié)構(gòu)提高有機(jī)電致發(fā)光器件性能的研究[D];天津理工大學(xué);2014年

本文編號(hào)：2032855