A stretchable, microscale inorganic light-emitting diode (μ-ILED) with an integrated coil for wireless power delivery is described F. G. Omenetto, J. A. Rogers, and co-workers on page 2812. The ultrathin layout of the μ-ILED, the serpentine structures in the metal traces, and the rubber substrate combine to provide a system that can be deformed to large levels of strain. Detailed studies of the mechanics reveal the underlying design principles. The physical characteristics and constituent materials enable its use as an implantable light source, as illustrated through in vivo studies using animal models.
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