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Open AccessArticle

Two-Color Pixel Patterning for High-Resolution Organic Light-Emitting Displays Using Photolithography

1
Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Korea
2
Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(7), 650; https://doi.org/10.3390/mi11070650
Received: 29 May 2020 / Revised: 26 June 2020 / Accepted: 29 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Organic Electronic Devices, Volume II)
Nowadays, the display industry is endeavoring to develop technology to provide large-area organic light-emitting diode (OLED) display panels with 8K or higher resolution. Although the selective deposition of organic molecules through shadow masks has proven to be the method of choice for mobile panels, it may not be so when independently defined high-resolution pixels are to be manufactured on a large substrate. This technical challenge motivated us to adopt the well-established photolithographic protocol to the OLED pixel patterning. In this study, we demonstrate the two-color OLED pixels integrated on a single substrate using a negative-tone highly fluorinated photoresist (PR) and fluorous solvents. Preliminary experiments were performed to examine the probable damaging effects of the developing and stripping processes upon a hole-transporting layer (HTL). No significant deterioration in the efficiency of the develop-processed device was observed. Efficiency of the device after lift-off was up to 72% relative to that of the reference device with no significant change in operating voltage. The procedure was repeated to successfully obtain two-color pixel arrays. Furthermore, the patterning of 15 μm green pixels was accomplished. It is expected that photolithography can provide a useful tool for the production of high-resolution large OLED displays in the near future. View Full-Text
Keywords: organic light-emitting diode (OLED), photolithography; pixel patterning; high resolution; highly fluorinated materials organic light-emitting diode (OLED), photolithography; pixel patterning; high resolution; highly fluorinated materials
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Choi, Y.M.; Shin, H.Y.; Son, J.; Park, C.; Park, K.-W.; Lee, J.-K.; Jung, B.J. Two-Color Pixel Patterning for High-Resolution Organic Light-Emitting Displays Using Photolithography. Micromachines 2020, 11, 650.

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