Wearable red–green–blue quantum dot light-emitting diode array using high-resolution intaglio transfer printing

Moon Kee Choi, Jiwoong Yang, Kwanghun Kang, Dong Chan Kim, Changsoon Choi, Chaneui Park, Seok Joo Kim, Sue In Chae, Tae-Ho Kim, Ji Hoon Kim, Taeghwan Hyeon () and Dae-Hyeong Kim ()
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Moon Kee Choi: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Jiwoong Yang: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Kwanghun Kang: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Dong Chan Kim: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Changsoon Choi: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Chaneui Park: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Seok Joo Kim: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Sue In Chae: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Tae-Ho Kim: Samsung Advanced Institute of Technology
Ji Hoon Kim: School of Mechanical Engineering, Pusan National University
Taeghwan Hyeon: Center for Nanoparticle Research, Institute for Basic Science (IBS)
Dae-Hyeong Kim: Center for Nanoparticle Research, Institute for Basic Science (IBS)

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Deformable full-colour light-emitting diodes with ultrafine pixels are essential for wearable electronics, which requires the conformal integration on curvilinear surface as well as retina-like high-definition displays. However, there are remaining challenges in terms of polychromatic configuration, electroluminescence efficiency and/or multidirectional deformability. Here we present ultra-thin, wearable colloidal quantum dot light-emitting diode arrays utilizing the intaglio transfer printing technique, which allows the alignment of red–green–blue pixels with high resolutions up to 2,460 pixels per inch. This technique is readily scalable and adaptable for low-voltage-driven pixelated white quantum dot light-emitting diodes and electronic tattoos, showing the best electroluminescence performance (14,000 cd m−2 at 7 V) among the wearable light-emitting diodes reported up to date. The device performance is stable on flat, curved and convoluted surfaces under mechanical deformations such as bending, crumpling and wrinkling. These deformable device arrays highlight new possibilities for integrating high-definition full-colour displays in wearable electronics.

Date: 2015
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DOI: 10.1038/ncomms8149

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