Thin-film transistor-driven vertically stacked full-color organic light-emitting diodes for high-resolution active-matrix displays

Sukyung Choi, Chan-mo Kang, Chun-Won Byun, Hyunsu Cho, Byoung-Hwa Kwon, Jun-Han Han, Jong-Heon Yang, Jin-Wook Shin, Chi-Sun Hwang, Nam Sung Cho, Kang Me Lee, Hee-Ok Kim, Eungjun Kim, Seunghyup Yoo and Hyunkoo Lee ()
Additional contact information
Sukyung Choi: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Chan-mo Kang: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Chun-Won Byun: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Hyunsu Cho: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Byoung-Hwa Kwon: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Jun-Han Han: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Jong-Heon Yang: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Jin-Wook Shin: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Chi-Sun Hwang: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Nam Sung Cho: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Kang Me Lee: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Hee-Ok Kim: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)
Eungjun Kim: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Seunghyup Yoo: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Hyunkoo Lee: Reality Display Research Section, Electronics and Telecommunications Research Institute (ETRI)

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Thin-film transistor (TFT)-driven full-color organic light-emitting diodes (OLEDs) with vertically stacked structures are developed herein using photolithography processes, which allow for high-resolution displays of over 2,000 pixels per inch. Vertical stacking of OLEDs by the photolithography process is technically challenging, as OLEDs are vulnerable to moisture, oxygen, solutions for photolithography processes, and temperatures over 100 °C. In this study, we develop a low-temperature processed Al2O3/SiNx bilayered protection layer, which stably protects the OLEDs from photolithography process solutions, as well as from moisture and oxygen. As a result, transparent intermediate electrodes are patterned on top of the OLED elements without degrading the OLED, thereby enabling to fabricate the vertically stacked OLED. The aperture ratio of the full-color-driven OLED pixel is approximately twice as large as conventional sub-pixel structures, due to geometric advantage, despite the TFT integration. To the best of our knowledge, we first demonstrate the TFT-driven vertically stacked full-color OLED.

Date: 2020
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DOI: 10.1038/s41467-020-16551-8

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