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

By M. Choi, Jiwoong Yang, Kwanghun Kang, Dong Chan Kim, Changsoon Choi, Chaneui Park, Seok Joo Kim, Sue In Chae, Tae-Ho Kim, Ji Hoon Kim and 2 more. Nature Communications, 2015

628 citations recorded by the source corpus.

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. Deformable and high-resolution LEDs have attracted great interest for wearable electronics, but full-colour display is still challenging. Using a stamp printing technology, Choi et al. build ultra-thin RGB quantum dot pixel arrays with luminous efficiency of 14,000 cd m−2operated at low voltage of 7 V.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/dbde34422ee17e825fc6e194e40fa08526dbb8f7

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In Biomedical Engineering

1. Zhong Lin Wang
2. Yunlong Zi
3. Jie Wang
4. Shengming Li
5. Fang Yi
6. Jun Lin
7. Youlong Xu
8. T. Hyeon

In Electrical and Electronic Engineering

1. Yunlong Zi
2. Jie Wang
3. Zhong Lin Wang
4. T. Hyeon
5. Wenzhuo Wu
6. Chengkuo Lee
7. Long Liu
8. Caofeng Pan

In Materials Chemistry

1. Yunlong Zi
2. Zhong Lin Wang
3. T. Hyeon
4. Jiwoong Yang
5. J. Pyun
6. Younan Xia
7. Sheng Xu
8. Yoshio Bando

Citations in the corpus

• Sustainably powering wearable electronics solely by biomechanical energy (2016, background): “To achieve the goal, three principles need to be considered: (1) The TENG in this work should have high output performance; (2) It should be easy for the TENG to harvest biomechanical energy from daily human motions; (3) The self-powered system should be wearable.”
• Flexible quantum dot light-emitting diodes for next-generation displays (2018, methodology): “proposed an intaglio transfer-printing technique that could pattern a 2460 ppi red-green-blue (RGB) QD array.(99) Unlike the technique base on structured stamps, the QD patterns were defined when the stamp, fully inked with QDs, was contacted to and released from the intaglio trench made on the Si w”