Organic light-emitting diodes on shape memory polymer substrates for wearable electronics |
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| Affiliation: | 1. Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;2. Johnson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, TX 75080, USA;3. Center for Organic Photonics and Electronics (COPE), School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia;3. Institute for Nuclear Research, Hungarian Academy of Sciences, H-4001 Debrecen, Hungary;1. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan, China;2. Center for Information in Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, China;3. Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA;4. Department of Pediatrics, Neurology and Neuroscience, University of Florida, Gainesville, FL, USA;5. Wilder Center of Excellence for Epilepsy Research, University of Florida, Gainesville, FL, USA;6. Mcknight Brain Institute, University of Florida, Gainesville, FL, USA |
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| Abstract: | Green electrophosphorescent organic light-emitting diodes (OLEDs) with inverted top-emitting structures are demonstrated on bio-compatible shape memory polymer (SMP) substrates for wearable electronic applications. The combination of the unique properties of SMP substrates with the light-emitting properties of OLEDs pave to the way for new applications, including conformable smart skin devices, minimally invasive biomedical devices, and flexible lighting/display technologies. In this work, SMPs were designed to exhibit a considerable drop in modulus when a thermal stimulus is applied, allowing the devices to bend and conform to new shapes when its glass transition temperature is reached. These SMP substrates were synthesized using 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (TATATO), trimethylolpropane tris(3-mercaptopropionate) (TMTMP), and tricyclo[5.2.1.02,6]decanedimethanol diacrylate (TCMDA), and show a low glass transition temperature of 43 °C, as measured using dynamic mechanical analysis (DMA). The OLEDs fabricated on these substrates exhibit high performance with a maximum efficacy of 33 cd/A measured at a luminance of 1000 cd/m2, and a peak luminance of over 30,000 cd/m2. |
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| Keywords: | Organic light-emitting diodes Flexible electronics Shape memory polymer substrates Inverted top-emitting geometry Conformable displays |
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