Organic/Inorganic Hybrid EIL for All-Solution-Processed OLEDs
Organic/Inorganic Hybrid EIL for All-Solution-Processed OLEDs
复制标题
用于全溶液处理 OLED 的有机/无机混合 EIL
DOI：
10.1002/aelm.201700380
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发表时间：
2018
影响因子：
6.2
通讯作者：
Yong Cao
中科院分区：
文献类型：
--
作者：
Chen Song;Zhanhao Hu Yu Luo Yangke Cun;Lei Wang Lei Ying Fei Huang;Junbiao Peng;Jian Wang;Yong Cao
溶液处理金属阴极来制造全溶液处理的有机发光二极管（OLED）可以显着降低其生产成本。然而，实现全溶液处理OLED的挑战在于发光层和高功函数溶液处理阴极之间的电子注入层（EIL）。除了提供有效的电子注入之外，EIL还应该抵抗溶剂，并防止溶剂渗透而损坏下面的有机功能层。新型聚[9，9-双（60-（N，N-二乙基氨基）己基）-芴-alt-9，9-双（3-乙基-（氧杂环丁烷-3-乙氧基）-己基）-芴]（PFN-OX）/ZnO杂化EIL结合了有机EIL和无机EIL的优点，实现了所有必要的功能。为了首次定量表征耐溶剂能力，通过检测聚（3，4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）的横向电导率开发了“溶剂检测器”。PFN-OX/ZnO杂化EIL不仅表现出比有机PFN-OX EIL更好的电子注入，而且保留了无机ZnO EIL的耐溶剂性和耐溶剂能力。基于PFN-OX/ZnO混合EIL，以旋涂的Ag纳米颗粒作为阴极制备了全溶液处理的OLED器件。聚（二苯并噻吩-S，S-二氧化物-co-9，9-二辛基-2，7-芴）蓝色发光器件在仅6.2 V下达到1000 cd m-2，发光效率为2.1 cd A-1。
Solution processing metal cathodes to fabricate all‐solution‐processed organic light‐emitting diodes (OLEDs) could significantly reduce their production cost. However, the challenge to realize all‐solution‐processed OLEDs lies in the electron injection layer (EIL) between the light emission layer and the high‐work‐function solution‐processed cathode. Aside from offering efficient electron injection, the EIL should resist the solvent, and prevent the solvent from permeating through to damage the organic functional layers beneath. Combining the advantages of both organic and inorganic EILs, a novel poly[9,9‐bis(60‐(N,N‐diethylamino)hexyl)‐fluorene‐alt‐9,9‐bis(3‐ethyl‐(oxetane‐3‐ethyloxy)‐hexyl)‐fluorene] (PFN‐OX)/ZnO hybrid EIL achieves all the necessary functions. To characterize the solvent‐proof capability quantitatively for the first time, a “solvent detector” is developed by detecting the poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate)'s lateral conductivity. The PFN‐OX/ZnO hybrid EIL not only shows better electron injection than the organic PFN‐OX EIL, but also retains the inorganic ZnO EIL's solvent resistance and solvent‐proof capability. Based on the PFN‐OX/ZnO hybrid EIL, all‐solution‐processed OLED devices are fabricated with spin‐coated Ag nanoparticles as the cathode. The poly(dibenzothiophene‐S,S‐dioxide‐co‐9,9‐dioctyl‐2,7‐fluorene) blue emission device reaches 1000 cd m−2at only 6.2 V with the luminous efficiency of 2.1 cd A−1.