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Slot-Die Coating of PEDOT : PSS for Large-Area OLED Lighting Sources  

Choi, Kwang-Jun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Lee, Jin-Young (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Jeon, Kyung-Jun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Yoo, Su-Ho (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Park, Jong-Woon (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Seo, Hwa-Il (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Seo, Yu Seok (Advanced Technology Research Team, YOULCHON CHEMICAL, CO., LTD.)
Publication Information
Journal of the Semiconductor & Display Technology / v.14, no.1, 2015 , pp. 61-65 More about this Journal
Abstract
We have fabricated poly(3,4-ethylenedioxythiophene) : poly(4-styrenesulfonate) (PEDOT : PSS) thin films using a slotdie coater for the applications of OLED lightings. It is demonstrated that the properties of slot-die coated PEDOT : PSS films are comparable with those of spin-coated ones. Namely, the average and peak-to-peak roughness of the slot-die coated 50-nm-thick PEDOT : PSS film are measured to be as low as 0.247 nm and 1.3 nm, respectively. Moreover, we have obtained excellent thickness uniformity (~1.91%). With the slot-die coated PEDOT : PSS films, we have fabricated green phosphorescent OLED devices. For comparison, we have also fabricated OLED devices with spin-coated PEDOT : PSS films. Both show almost no discrepancy in device performance. The power efficiency (25.4 lm/W) and emission uniformity (77%) of OLEDs with slot-die coated PEDOT : PSS films are shown to be slightly lower than those (27.3 lm/W, 80%) of OLEDs with spin-coated PEDOT : PSS films at the luminance of 1,000nit, increasing the feasibility of using a slot-die coating process for the fabrication of large-area OLED lighting sources at a competitive price.
Keywords
Slot-die coating; PEDOT : PSS; OLED lightings; solution process;
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Times Cited By KSCI : 1  (Citation Analysis)
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