Browse > Article

Effect of the Microtip Length in a Slot-die Head on Fine Stripe Coatings  

Lee, Jinyoung (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Park, Jongwoon (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Semiconductor & Display Technology / v.18, no.4, 2019 , pp. 69-74 More about this Journal
Abstract
The aim of this work is to investigate the effect of the microtip length in a slot-die head on coating of a fine poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) stripe. To this end, we have employed a meniscus guide with a 150-㎛-wide microtip and performed roll-to-roll slot-die coatings by varying its length between 500 ㎛ and 50 ㎛. When the microtip length is 150 ㎛ or shorter, we have observed three unexpected phenomena; 1) though the solution spreads much wider than the microtip width, yet the coated stripe width is almost the same as the microtip width, 2) the stripe width decreases, but the stripe thickness is rather increased with increasing coating speed at a fixed flow rate, 3) we obtain stripes much narrower than the microtip width at high coating speeds. It is due to the fact that 1) the meniscus is not well controlled by a short microtip, 2) the main stream of solution from the outlet is very close to the substrate and thus the distributed solution along the head lip merges with the main stream, and 3) the solution is not spread over the entire microtip end at high coating speeds, causing a tiny wobble in the meniscus. Using the 150-㎛-wide and 250-㎛-long microtip, we have fabricated 153-㎛-wide and 94-nm-thick PEDOT:PSS stripe at the maximum coating speed of 13 mm/s. To demonstrate its applicability in solution-processable organic light-emitting diodes (OLEDs), we have also fabricated an OLED device with the fine PEDOT:PSS stripe and obtained strong light emission from it.
Keywords
Slot-die coating; Fine organic stripe; microtip; Computational fluid dynamics (CFD); Organic light-emitting diode (OLED);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Chesterfield, R., Johnson, A., Lang, C., Stainer, M., and Ziebarth, J., "Solution-Coating Technology for AMOLED Displays," Inf. Disp., Vol. 27, pp. 24-30, 2011.
2 Choi, Y., Kim, K., Lee, E., Jo, J., and Lee, T., "Fabrication of a single-layer metal-mesh touchscreen sensor using reverse-offset printing," J. Inf. Disp., Vol. 16, pp. 37-41, 2015.   DOI
3 Harkema, S., Mennema, S., Rooms, H., and Barink, M., "Large area ITO-free flexible white OLEDs with Orgacon PEDOT: PSS and printed metal shunting lines," Proc. Of SPIE, Vol. 7415, pp. 74150T, 2009.
4 Lu, N., and Kim, D., "Flexible and stretchable electronics paving the way for soft robotics," Soft Robot., Vol. 1, pp. 53-62, 2014.   DOI
5 Shin, D., Lee, Y., and Kim, C., "Performance characterization of screen printed radio frequency identification antennas with silver nanopaste, " Thin Solid Films, Vol. 517, pp. 6112-6118, 2009.   DOI
6 Kim, G., Shin, D., Lee, J., and Park, J., "Effect of surface morphology of slot-die heads on roll-to-roll coatings of fine PEDOT:PSS stripes," Org. Electron., Vol. 66, pp. 116-125, 2019.   DOI
7 Yoo, S., Lee, J., and Park, J., "Structure Optimization of a Slot-Die Head with a Hydrophobic Micro-Patterns for Stripe Coatings, " J. of The Korean Society of Semiconductor & Display Technology, Vol. 18, pp. 6-10, 2019.