Abstract
Inorganic light-emitting diodes and photodetectors represent important, established technologies for solid-state lighting, digital imaging and many other applications. Eliminating mechanical and geometrical design constraints imposed by the supporting semiconductor wafers can enable alternative uses in areas such as biomedicine and robotics. Here we describe systems that consist of arrays of interconnected, ultrathin inorganic light-emitting diodes and photodetectors configured in mechanically optimized layouts on unusual substrates. Light-emitting sutures, implantable sheets and illuminated plasmonic crystals that are compatible with complete immersion in biofluids illustrate the suitability of these technologies for use in biomedicine. Waterproof optical-proximity-sensor tapes capable of conformal integration on curved surfaces of gloves and thin, refractive-index monitors wrapped on tubing for intravenous delivery systems demonstrate possibilities in robotics and clinical medicine. These and related systems may create important, unconventional opportunities for optoelectronic devices.
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Acknowledgements
We thank T. Banks for help with processing using facilities at the Frederick Seitz Materials Research Laboratory, J. D. Sulkin for help with luminance–current–voltage measurement, H-S. Kim for discussions and C. Conway and D. Stevenson for help with photography. We also thank Georgios A. Bertos, Ph.D., Sr R&D Principal Engineer Technology Resources Engineering, Baxter Healthcare Corporation, for discussions. This material is based on work supported by Ford Motor Company, the National Science Foundation under grant DMI-0328162 and the US Department of Energy, Division of Materials Sciences, under Award No. DE-FG02-07ER46471, through the Materials Research Laboratory and Center for Microanalysis of Materials (DE-FG02-07ER46453) at the University of Illinois at Urbana-Champaign. R-H.K. would like to thank Samsung Electronics for doctoral fellowships. J.A.R. acknowledges support from a National Security Science and Engineering Faculty Fellowship from the Department of Defense. Y.H. acknowledges support from NSF (OISE-1043143 and ECCS-0824129). F.G.O. and D.L.K. acknowledge support from the US Army Research Laboratory and the US Army Research Office under contract number W911 NF-07-1-0618 and by the DARPA-DSO and the NIH P41 Tissue Engineering Resource Center (P41 EB002520). We also thank the NIH P41 Tissue Engineering Resource Center (P41 EB002520) for support of the studies, all of which were conducted under approved animal protocols at Tufts University.
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R-H.K., D-H.K., B.H.K., S-I.P. and J.A.R. designed the experiments. R-H.K., D-H.K., B.H.K., J.X., B.P., J.Y., M.L., Z.J.L., A-P.L., D.G.K., F.G.O., Y.H., Z.K. and J.A.R. carried out experiments and analysis. R-H.K., D-H.K., J.X., R.G., J.Y., Y.H., F.G.O., D.L.K. and J.A.R. wrote the paper.
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Kim, RH., Kim, DH., Xiao, J. et al. Waterproof AlInGaP optoelectronics on stretchable substrates with applications in biomedicine and robotics. Nature Mater 9, 929–937 (2010). https://doi.org/10.1038/nmat2879
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DOI: https://doi.org/10.1038/nmat2879
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