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Fabrication of Fine PEDOT:PSS Stripes Using Needle Coating  

Lee, Jinyoung (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Park, Jongwoon (School of Electrical & Communication Engineering,)
Publication Information
Journal of the Semiconductor & Display Technology / v.18, no.3, 2019 , pp. 100-104 More about this Journal
Abstract
We have investigated the feasibility of fabricating fine stripes using needle coating for potential applications in solution-processed organic light-emitting diodes (OLEDs). To this end, we have employed an aqueous poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) solution that has been widely used as a hole injection layer (HIL) of OLEDs and performed needle coatings by varying the process parameters such as the coating gap and coating speed. As expected, the stripe width is reduced with increasing coating speed. However, the central thickness of the stripe is rather increased as the coating speed increases, which is different from other coating processes such as slot-die and blade coatings. It is due to the fact that the meniscus formed between the needle tip and the substrate varies depending sensitively on the coating speed. It is also found that the stripe width and thickness are reduced with increasing coating gap. To demonstrate its applicability to OLEDs, we have fabricated a red OLED stripe and obtained light emission with the width of about 90㎛.
Keywords
Needle coating; Fine stripe; PEDOT:PSS; Solution process; OLED;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Ye, D., Ding, Y., Duan, Y., Su, J., Yin, Z, and Huang, Y., "Large-Scale Direct-Writing of Aligned Nanofibers for Flexible Electronics," Small, Vol. 14, p. 1703521, 2018.   DOI
2 Kim, B. et al., "High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes", Nano Lett., Vol. 15, pp. 969-973, 2015.   DOI
3 Yoo, S., Lee, J., and Park, J., "Simulation of Capillary Flow Along a Slot-die Head for Stripe Coatings," J. of The Korean Society of Semiconductor & Display Technology, Vol. 18, pp. 51-52, 2019.
4 Li, R., Hu, A., Zhang, T., and Oakes, K., "Direct Writing on Paper of Foldable Capacitive Touch Pads with Silver Nanowire Inks," ACS Appl. Mater. Interfaces, Vol. 6, pp. 21721-21729, 2014.   DOI
5 Wang, H. et al., "Direct Writing of a 90 wt% Particle Loading Nanothermite," Adv. Mater., Vol. 31, p. 1806575, 2019.   DOI
6 Matatagui, D. et al., "Real-Time Characterization of Electrospun PVP Nanofibers as Sensitive Layer of a Surface Acoustic Wave Device for Gas Detection," J. Nanostruct., Vol. 21, pp. 1-8, 2014.