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Fine stripe coating and micro patterning of organic thin films using double nozzles for OLEDs
Organic Electronics ( IF 3.2 ) Pub Date : 2020-09-23 , DOI: 10.1016/j.orgel.2020.105957
Jinyoung Lee , Xun Li , Jongwoon Park

The aim of this work is to investigate the feasibility of coating and patterning of fine organic thin-film stripes using double nozzles. For fine stripe coating of an aqueous poly (3,4-ethylenedioxythiophene):poly (4-styrenesulfonate) (PEDOT:PSS), we have changed the outer surface of the needle from hydrophilic to hydrophobic in such a way that lateral capillary force is suppressed and thus the PEDOT:PSS stripe becomes narrow. Using a table coater with the hydrophobic needle (inner diameter = 51 μm), we have achieved the 54-μm-wide PEDOT:PSS stripe at a maximum coating speed of 30 mm/s. For micro patterning of PEDOT:PSS thin-film stripes, we have employed double needles; one for discharging the main solvent of the underlying thin film and the other for sucking the dissolved thin film. It is found that the pattern width decreases as the patterning speed increases and the pattern factor (the ratio of film thickness to slope length) is of the order of 10−3 due to the isotropic patterning characteristics. Such a patterning scheme is also shown to remove non-aqueous poly (N-vinylcarbazole) (PVK) films coated in the presence of a bank structure. With the coating and patterning process, we have successfully fabricated multiple OLED stripes, an OLED device with the patterned light-emitting stripe, and OLED pixels, demonstrating its potential applicability to solution-processable OLEDs.



中文翻译:

使用用于OLED的双喷嘴对有机薄膜进行细条涂布和微图案化

这项工作的目的是研究使用双喷嘴对有机薄膜细条进行涂层和构图的可行性。为了对聚(3,4-乙撑二氧噻吩):聚(4-苯乙烯磺酸盐)(PEDOT:PSS)水溶液进行细条涂层,我们将针的外表面从亲水性更改为疏水性,从而使侧向毛细作用力为抑制,因此PEDOT:PSS条带变窄。使用带有疏水针(内径= 51μm)的台式涂布机,我们以30 mm / s的最大涂布速度获得了54μm宽的PEDOT:PSS条。对于PEDOT:PSS薄膜条的微图案,我们使用了双针;一种用于排放底层薄膜的主要溶剂,另一种用于抽吸溶解的薄膜。-3由于各向同性构图特性。还显示出这种图案化方案可去除在堤结构存在下涂覆的非水聚(N-乙烯基咔唑)(PVK)薄膜。通过涂覆和构图工艺,我们成功地制造了多个OLED条,具有带图案的发光条的OLED器件以及OLED像素,证明了其在溶液可加工OLED中的潜在适用性。

更新日期:2020-09-29
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