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Inkjet Printing of an Electron Injection Layer: New Role of Cesium Carbonate Interlayer in Polymer OLEDs

机译:喷墨印刷电子注入层:碳酸铯层间在聚合物OLED中的新作用

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摘要

Among solution-processable techniques, inkjet printing is a potential method for manufacturing low-cost and high-resolution polymer organic light-emitting diodes (PLEDs) for displays/solid-state lighting applications. Herein, we demonstrate use of the inkjet printed cesium carbonate (Cs2CO3) film as an electron injection interlayer. We have elaborated the Cs2CO3 ink using an alcohol-based solvent for the industrial-grade printhead. The printed Cs2CO3 layer morphology was investigated by means of an optical microscope and an atomic force microscope. The PLEDs based on emissive polymer (Super Yellow) with printed Cs2CO3 interlayer show a remarkable current efficiency and luminance compared to the PLEDs made without the Cs2CO3 layer. Such results suggest that the Cs2CO3 is a promising material for the formulation of the electron injecting inkjet inks. The possibility of inkjet printing of an efficient electron injecting layer enables in situ patterning of PLEDs’ emission area. Such a simple and flexible technique can be applied for a wide range of applications such as signage, pictograms, advertising, smart packaging, etc.
机译:在解决方案中,喷墨印刷是用于制造用于显示/固态照明应用的低成本和高分辨率聚合物有机发光二极管(PLED)的潜在方法。在此,我们证明了喷墨印刷碳酸铯(CS2CO3)膜作为电子注射层间的用途。我们使用醇的溶剂为工业级打印头阐述了CS2CO3墨水。通过光学显微镜和原子力显微镜研究了印刷的CS2CO3层形态。与印刷的CS2CO3中间层的发光聚合物(超黄色)的镀层相比,与没有CS2CO3层的镀层相比,具有显着的电流效率和亮度。这样的结果表明CS2CO3是用于制定电子注入喷墨油墨的有希望的材料。喷墨印刷有效的电子注入层的可能性使得能够对PLEDS的排放区域进行原位图案化。这种简单且灵活的技术可以应用于广泛的应用,例如标牌,象形图,广告,智能包装等。

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