Flexographic printing of ultra-thin semiconductor polymer layers
Flexographic printing of ultra-thin semiconductor polymer layers
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DOI：
10.1088/2053-1613/3/1/015001
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发表时间：
2016-03-01
期刊：
影响因子：
--
通讯作者：
Phillips, Chris
中科院分区：
文献类型：
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作者：
Mogg, Benjamin Thomas;Claypole, Tim;Phillips, Chris
有效地制造和控制有机发光二极管(OLED)或光伏层的方法对于实现功能和耐用的器件至关重要。为了避免OLED中的发光不均匀，沉积的薄膜需要均匀和均匀。虽然在OLED内沉积超薄的亚100 nm层的方法是有效的，但它们相对缓慢和昂贵。因此，本文论证了柔性版印刷作为在玻璃基板上沉积OLED半导体层的另一种方法。在这种情况下，使用了分散在二甲苯中的专有半导体聚氟。这种材料起到打孔注入层的作用。低聚合物浓度和对芳香族溶剂的要求对该工艺提出了挑战；传统的光致聚合物印版在与二甲苯和橡胶印版接触时会迅速降解，并被发现具有足够的弹性。通过优化印刷参数和对印版和基材进行UV/臭氧曝光表面改性，获得了一致的亚100 nm薄膜。柔性版印刷将能够大幅缩短层制造时间，并允许卷筒以较低的成本进行批量生产。本文的研究表明，通过超薄层的连续印刷，柔版印刷将成为OLED或显示技术应用的一种可行的、经济有效的方法，将有助于柔性印刷的发展。
Methods of fabricating and controlling organic light emitting diode (OLED) or photovoltaic layers effectively are paramount for achieving a functional and durable device. The deposited film needs to be uniform and homogeneous to avoid non-uniform luminescence in the OLED. Although methods of depositing the ultra-thin sub 100 nm layers within OLED are effective, they are relatively slow and expensive. This paper therefore demonstrates flexography as an alternative method for depositing the semiconductor layer for OLED onto glass substrate. In this case a proprietary semiconducting polyflourine dispersed in xylene was used. This material functions as the hole injecting layer. The low polymer concentration and requirement for aromatic solvent presented challenges for the process; conventional photopolymer printing plates degraded rapidly on contact with xylene and rubber printing plates were found to be sufficiently resilient. Through optimisation of printing parameters and surface modification of both the printing plate and substrate with UV/ozone exposure, a consistent sub-100 nm film was achieved. Flexographic printing will enable a substantial reduction in layer fabrication time, as well as allowing roll to roll mass production at lower cost. The research indicated within this paper will aid the progression of flexography as a viable cost effective method for OLED or display technology application through continuous printing of ultra-thin layers.