title: Wearable red-green-blue quantum dot light-emitting diode array using high-resolution intaglio transfer printing.
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.
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Moon Kee
authors.initials: MK
authors.lastname: Choi
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Jiwoong
authors.initials: J
authors.lastname: Yang
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Kwanghun
authors.initials: K
authors.lastname: Kang
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Dong Chan
authors.initials: DC
authors.lastname: Kim
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Changsoon
authors.initials: C
authors.lastname: Choi
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Chaneui
authors.initials: C
authors.lastname: Park
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Seok Joo
authors.initials: SJ
authors.lastname: Kim
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Sue In
authors.initials: SI
authors.lastname: Chae
authors.affiliation: Samsung Advanced Institute of Technology, 130, Samsung-ro, Yeongtong-gu, Suwon 443-803, Republic of Korea.
authors.forename: Tae-Ho
authors.initials: TH
authors.lastname: Kim
authors.affiliation: School of Mechanical Engineering, Pusan National University, Busan 609-735, Republic of Korea.
authors.forename: Ji Hoon
authors.initials: JH
authors.lastname: Kim
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon
authors.affiliation: 1] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea [2] School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Dae-Hyeong
authors.initials: DH
authors.lastname: Kim