Stretchable array of CdSe/ZnS quantum-dot light emitting diodes for visual display of bio-signals
- Authors
- Lee, Yonghui; Kim, Dong Sik; Jin, Sang Woo; Lee, Hanchan; Jeong, Yu Ra; You, Ilhwan; Zi, Goangseup; Ha, Jeong Sook
- Issue Date
- 1-1월-2022
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Bio-signals; Body movement; Liquid metal; QD-LED; Skin temperature; Stretchable display
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.427
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 427
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135275
- DOI
- 10.1016/j.cej.2021.130858
- ISSN
- 1385-8947
- Abstract
- Display devices that can visually present various bio-signals are a core future technology required for skin attachable wearable electronics. Quantum dot light emitting diodes (QD-LEDs), which can be used as high performance display devices, exhibit many advantages such as a narrow bandwidth, high color purity, high environmental stability, easy and fast processing, and a high brightness at low voltage. In this study, we report on the fabrication of a stretchable QD-LED array for the visual display of body movement and skin temperature signals from skin-attached sensors. After forming an array of a rigid NOA63 islands, an array of CdSe/ZnS QDLEDs is fabricated on top of that island array and electrically connected using liquid metal Galinstan interconnections. Finally, the array of QD-LEDs on the NOA63 islands is transferred onto a stretchable elastomer substrate of Ecoflex/PDMS. Of particular importance, for stable performance of the QD-LEDs under deformation, in replacement of the conventionally used ITO, a flexible and highly transparent electrode of Au grid/Ethylene glycol doped PEDOT:PSS is used. Such a design architecture can minimize the strain applied to the QD-LEDs by concentrating the strain onto the soft elastomer film substrate and the Galinstan interconnections. As a result, the fabricated QD-LED array exhibits stable operation under both 50% uniaxial and 30% biaxial strains. After attachment of the stretchable QD-LED array onto skin, the extent of knee bending, and changes in skin temperature are displayed as changes in the pattern of the QD-LED array. This work demonstrates the potential application of our stretchable array of QD-LEDs for easy and daily monitoring of health conditions through a visual display.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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