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Journal Article
Stacked quantum dot organic light-emitting diodes in an industrial-grade inkjet printing process
- Authors
- Byoung-Hwa Kwon, Jin-Wook Shin, Chul Woong Joo, Chan-Mo Kang, Hyunsu Cho, Sukyung Choi, Yoonsung Yoo, Hyungwoo Suh, Dong-Kyun Shin, Jaeryul Yu, Yeon Soo Lee, Seongju Kim, Sungjune Jung, Chun Sakong, Chun-Won Byun, Nam Sung Cho
- Issue Date
- 2026-07
- Citation
- Chemical Engineering Journal, v.539, pp.1-12
- ISSN
- 1385-8947
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Quantum dot organic light-emitting diode (QD-OLED) displays offer advantages such as wide color gamut, excellent viewing angles, and high contrast ratios. In addition, QD-OLED technology holds significant potential as a core technology for various next-generation displays, including micro-LEDs, OLED on silicon, and reflective displays. This paper reports the development of a novel stacked QD-OLED panel that outperforms QD-OLED panels currently under development in the display industry. Compared with existing QD-OLED displays, the stacked QD-OLED developed in this study can simplify the panel manufacturing process and reduce manufacturing costs by applying a continuous vertical stacking process on a single substrate. Furthermore, the stacked QD-OLED offers structural advantages at the device and panel levels that can suppress optical interference in high-resolution displays. In particular, the fabrication of QD pixels for the stacked QD-OLED is demonstrated using QD ink, a black pixel-defining layer (PDL) photoresist, and inkjet printing components and equipment suited for industrial-scale display manufacturing. A black PDL material with a high aspect ratio and a process technology that operates below 100 °C, essential for realizing stacked QD-OLED panels, are introduced. Finally, by integrating industrially applicable materials, processes, and equipment technologies, a novel stacked QD-OLED panel with a total of 184,800 subpixels and a resolution of 141 pixels per inch, equivalent to that of a 65-inch 8K television, was successfully demonstrated through a 6-inch large-area manufacturing process.
- Keyword
- Color conversion, Inkjet printing, Pixel-defining layer, Stacked QD-OLED
- KSP Keywords
- High Aspect Ratio, High-resolution displays, Industrial-scale, Inkjet printing, Manufacturing processes, Micro light-emitting diodes(micro-LEDs), Next-generation, OLED displays, OLED technology, Printing process, Quantum dot(Qdot)
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
