喷墨打印聚合物薄膜均匀性调控研究进展

摘要

聚合物发光显示材料具有发光颜色在全可见光区可调、可溶液简单加工及适用于柔性大面积基底的特点,成为目前研究的热点.在聚合物发光薄膜图案化技术中,喷墨打印因为具有加工过程简单高效、适用于溶液方式加工、柔性的加工过程等特点而被认为是最具有应用潜力的技术.高质量聚合物薄膜的制备是高精度发光显示器件制作的关键,但喷墨打印液滴在干燥过程中通常伴随着"咖啡环"现象,造成薄膜不均匀沉积.因此,消除"咖啡环"现象,实现聚合物薄膜的均匀沉积,是喷墨打印高性能器件的重要研究方向.本文主要论述了"咖啡环"效应的产生机理,如何抑制喷墨打印聚合物薄膜加工过程中的"咖啡环"效应,最终实现聚合物薄膜均匀性调控.%Flat panel displays(FPDs)of polymer light-emitting diodes(PLEDs)attract more attention in this field because of the color tunability of polymer materials within the entire visible spectrum, simple solution processability,and suitability for large area and flexible substrates.For the patterning method of polymer light-emitting films,inkjet printing is a potential technique for applications because of its simple and high efficient patterning process, suitability for solution process, flexibility of the patterning process, and easiness to integration and automatization.The deposition of high quality polymer film is essential for fabricating high-performance PLEDs.However, a ring-shaped film is often formed on the substrate due to the"coffee ring"effect in inkjet printing.Therefore, it is essential to eliminate the"coffee ring"effect to achieve uniform deposition of polymer film.In this paper, we review the progress on avoiding"coffee ring"effect to achieve high uniformity of inkjet printing polymer films.