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Appl. Sci. 2018, 8(2), 203;

Nozzle Printed-PEDOT:PSS for Organic Light Emitting Diodes with Various Dilution Rates of Ethanol

Micro/Nano Process Group, Korea Institute of Technology (KITECH), Sangnok-gu, Ansan-si 15588, Korea
Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 26 January 2018 / Accepted: 28 January 2018 / Published: 30 January 2018
(This article belongs to the Special Issue Printed Electronics 2017)
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In this study, we investigated the ink formulation of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as the hole injection layer (HIL) in an organic light emitting diode (OLED) structure. Generally, in a PEDOT:PSS solution, water is incorporated in the solution for the solution process. However, the fabrication of thin film which contained the water, main solvent, could not easily form by using printing technology except spin-coating process because of the high surface tension of water. On the other hand, mixing PEDOT:PSS solution and ethanol (EtOH), a dilution solvent, could restrain the non-uniform layer that forms by the high surface tension and low volatility of water. Therefore, we printed a PEDOT:PSS solution with various concentrations of EtOH by using a nozzle printer and obtained a uniform pattern. The line width of PEDOT:PSS diluted with 90% (volume ratio) ehtanol was measured as about 4 mm with good uniformity with a 0.1 mm nozzle. Also, imaging software and a scanning electron microscope (SEM) were used to measure the uniformity of PEDOT:PSS coated on a substrate. Finally, we fabricated a green phosphorescent OLED device with printed-PEDOT:PSS with specific concentrations of EtOH and we achieved a current efficiency of 27 cd/A with uniform quality of luminance in the case of device containing 90% EtOH. View Full-Text
Keywords: nozzle printing; PEDOT:PSS; ethanol; dilution rate; OLED; grey scale method nozzle printing; PEDOT:PSS; ethanol; dilution rate; OLED; grey scale method

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Yoon, D.G.; Kang, M.; Kim, J.B.; Kang, K.-T. Nozzle Printed-PEDOT:PSS for Organic Light Emitting Diodes with Various Dilution Rates of Ethanol. Appl. Sci. 2018, 8, 203.

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