本文選題：有機電致發(fā)光器件(OLED) + 銀(Ag)　； 參考：《合肥工業(yè)大學》2017年碩士論文

【摘要】：隨著透明柔性有機電致發(fā)光顯示器件(organic light emitting devices,OLED)從概念轉向產(chǎn)品,其制備技術、產(chǎn)品應用多元化在未來都會有很大發(fā)展。而電極是其結構中非常重要的一部分,所以開發(fā)性能穩(wěn)定的透明柔性電極具有一定的科研價值。本文研究的可用于OLED器件的透明柔性電極主要有以下三個部分:(1)采用紫外光(UV)改性銀(Ag)陽極的方法,改善透明Ag陽極與其他功能層的注入勢壘,并研究了不同時長UV改性Ag陽極對結構為Ag/N,N′-二苯基-N,N′-(1-萘基)-1,1′-聯(lián)苯-4,4′-二胺(NPB)/8-羥基喹啉鋁(Alq3)/氟化鋰(Li F)/鋁(Al)的OLED器件性能的影響。Ag陽極改性后,表面產(chǎn)生銀氧化層(Ag~((Ⅰ))Ag~((Ⅲ))O_2),實際工作陽極為Ag/Ag~((Ⅰ))Ag~((Ⅲ))O_2。此時陽極面電阻為1.8Ω/cm~2,功函數(shù)為5.17 eV,陽極和有機物界面處的空穴注入勢壘從原來的0.80 eV降低到0.53eV,這相較于未改性的Ag陽極,大幅降低了空穴注入勢壘,使該綠光OLED器件的性能得到很大提升。其中最優(yōu)器件的改性時長為50 s,最大亮度從101.6 cd/m~2提高到5609.2 cd/m~2,啟亮電壓從20 V降低到6 V,電流效率得到很大提高。對進一步改善采用Ag作為陽極的透明柔性OLED器件性能有一定的應用前景。(2)用超薄層Al/LiF修飾Ag、Ag/氧化鉬(MoO3)/Ag、金(Au)等透明陽極結構代替Al制作了可用于OLED的透明陰極,制成了雙面出光的微細尺寸OLED器件。還分析并驗證了Al/Li F修飾功函數(shù)較高的陽極電極能夠做陰極的原因為:Al和LiF在被蒸鍍?yōu)殛帢O修飾層時,兩者膜層比較薄,會在蒸鍍后與Alq3形成解離的陰離子,形成離子的漂移,提高了陰極的電子注入能力及其傳輸能力。這對制備透明柔性三基色的白光OLED器件具有基礎指導意義。(3)利用噴涂的方法制作了基于納米銀線(AgNWs)材料的透明柔性電極,并引入聚乙烯吡咯烷酮(PVP)修飾層提升電極薄膜的機械彎曲能力及電學性能。然后通過優(yōu)化噴涂濃度、層數(shù)及熱處理時間制作了PVP/AgNWs透明柔性導電薄膜。薄膜在可見光波段380 nm—780 nm時透過率范圍在53.4%—67.9%,面電阻為30Ω/cm~2。在彎曲測試中,經(jīng)過500次彎曲,面電阻幾乎不發(fā)生改變,顯示出了優(yōu)良的穩(wěn)定性。經(jīng)過180 s的超聲,表面膜依然完整,且能夠保持優(yōu)異的導電性能。在空氣中放置1000 h后,導電薄膜的表面電阻從30Ω/cm~2增加到36Ω/cm~2。在進一步的脫膜工藝的優(yōu)化中,大幅度降低其表面粗糙度,后續(xù)可以通過引入修飾層,進一步提升了OLED器件的性能。
[Abstract]:With the transition from concept to product of transparent flexible organic electroluminescent display device (Ole), its preparation technology and product application diversification will have great development in the future. The electrode is a very important part of its structure, so the development of transparent flexible electrode with stable performance has certain scientific research value. In this paper, the transparent flexible electrode used in OLED devices is mainly composed of the following three parts: 1) the method of using UV (UV) modified silver silver anode to improve the injection barrier between transparent Ag anode and other functional layers. The effect of UV modified Ag anode on the properties of OLED devices with Ag- / N- (N-) -diphenyl-N- (N-) -diphenyl-N- (1)-1-naphthyl-(1)-1-(1)-(1)-(1)-(1) -biphenyl-4- (4)-diphenyl-4-aniline-diphenyl-4-aniline-diphenyl-4-hydroxyquinoline aluminum (Alq3 / 8-hydroxyquinoline aluminum)-Alq3 / LiF / Al) has been studied after the modification of Ag anode. A silver oxide layer is formed on the surface. The anode surface resistance is 1.8 惟 / cm ~ (-2), the work function is 5.17 EV, and the hole injection barrier at the anode and organic interface is reduced from 0.80 EV to 0.53 EV. Compared with the unmodified Ag anode, the hole injection barrier is greatly reduced. The performance of the green OLED device is greatly improved. The modification time of the optimal device is 50 s, the maximum brightness is increased from 101.6 cd/m~2 to 5609.2 CD / m ~ (2), the starting voltage is reduced from 20 V to 6 V, and the current efficiency is greatly improved. The properties of transparent flexible OLED devices using Ag as anode have a certain application prospect. (2) transparent anode structures such as ultrathin layer Al/LiF modified Ag-Ag / Moo _ 3 / Ag, au _ au) have been used to prepare transparent cathode for OLED instead of Al. A micro-size OLED device with double-sided light was fabricated. It is also analyzed and verified that the anode electrode with higher Al/Li F modification work function can be used as cathode. The reason is that when Al/Li Al and LiF are evaporated as cathodic modified layer, the film is thin, which will form dissociated anions with Alq3 after evaporation and form ion drift. The electron injection ability and the transmission ability of the cathode are improved. This is of fundamental guiding significance for the preparation of transparent flexible trichromatic white OLED devices. The transparent flexible electrodes based on nanocrystalline silver wire (AgNWs) materials have been fabricated by spraying method. Polyvinylpyrrolidone (PVP) modified layer was introduced to improve the mechanical bending and electrical properties of the film. Then the transparent and flexible conductive PVP/AgNWs thin films were prepared by optimizing the spraying concentration, the number of layers and the heat treatment time. The transmittance of the film is in the range of 53.4- 67.9 at 380 nm-780 nm, and the surface resistance is 30 惟 / cm ~ (-2). In the bending test, after 500 times of bending, the surface resistance is almost unchanged, showing good stability. After 180 s of ultrasound, the surface film is still intact and can maintain excellent conductivity. After being placed in air for 1000 h, the surface resistance of the conductive film increases from 30 惟 / cm ~ (2) to 36 惟 / cm ~ (2). In the further optimization of defilm process, the surface roughness can be greatly reduced, and the performance of OLED devices can be further improved by the introduction of modified layer.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN873.3

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