Journal
CHEMICAL ENGINEERING JOURNAL
Volume 427, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130858
Keywords
Stretchable display; QD-LED; Bio-signals; Liquid metal; Skin temperature; Body movement
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2019R1A2B5B03069545]
- KU-KIST graduate school program of Korea University
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In this study, a stretchable QD-LED array was fabricated for displaying body movement and skin temperature signals from skin-attached sensors. The design minimized strain on the QD-LEDs by concentrating stress on the soft elastomer film substrate and Galinstan interconnections, resulting in stable operation under deformation. This work demonstrates the potential application of stretchable QD-LED arrays for easy and daily monitoring of health conditions through visual display.
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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