Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University , Wuhan 430072, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Oct 4;9(39):34139-34145. doi: 10.1021/acsami.7b09644. Epub 2017 Sep 25.
A low-cost and easy-process scheme for solution-processed organic light-emitting devices (OLEDs) was provided to overcome the flaws of poly(styrene sulfonic acid)-doped poly(3,4-ethylenedioxythiphene) (PEDOT:PSS) together with the indium tin oxide anode. The modified PEDOT:PSS with higher work function (5.66 eV) and more efficient hole injecting ability was obtained by simply mixing the aqueous PEDOT:PSS with InCl and then consecutive ultraviolet-ozone treatment. The simply structured and solution-processed OLEDs with our modified PEDOT:PSS achieved a very high external quantum efficiency of 21.0% using a classic thermally activated delayed fluorescence emitter, 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene. The origin of this great promotion was explored through photoelectron spectroscopy, Fourier transform infrared reflection spectroscopy, and atomic force microscopy, from which we inferred that InCl itself, the losing of insulting PSS outer shell, and transformation to quinoid structure of PEDOT chains accounted for this improvement. Our modification method of PEDOT:PSS is beneficial for promoting solution-processed organic semiconducting devices.
提供了一种低成本、易处理的溶液处理有机发光器件（OLED）方案，以克服聚（苯乙烯磺酸）掺杂聚（3,4-亚乙基二氧噻吩）（PEDOT：PSS）与铟锡氧化物阳极结合的缺陷。通过简单地将水性 PEDOT：PSS 与 InCl 混合，然后进行连续的紫外臭氧处理，获得了具有更高功函数（5.66 eV）和更高效空穴注入能力的改性 PEDOT：PSS。使用经典的热活化延迟荧光发射器 2,4,5,6-四（咔唑-9-基）-1,3-二氰基苯，我们简单结构的溶液处理 OLED 采用改性的 PEDOT：PSS 实现了非常高的外量子效率 21.0%。通过光电子能谱、傅里叶变换红外反射光谱和原子力显微镜探索了这种巨大提升的起源，我们推断 InCl 本身、绝缘 PSS 外壳的损失以及 PEDOT 链的醌型结构的转化解释了这种改进。我们对 PEDOT：PSS 的改性方法有利于促进溶液处理有机半导体器件。
