Capacitive Pressure Sensing Electroluminescent Displays with Micropatterned Ionic Gels
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Simultaneous detecting and visualizing pressure provides a useful platform to obtain information about a pressurizing object, but the fabrication of such displays at the single-device level remains challenging. Here, we present a single-device level pressure responsive electroluminescent display that allows for both sensing and visualization of pressure. Our device is based on a two-terminal capacitor with six layers: top electrode/ pressure sensitive insulator/hole injection layer/emissive layer/electron transport layer/bottom electrode. Light emission between two electrodes is controlled by the capacitance change of the insulator arising from the pressure. Besides capacitive pressure sensing, our display allows for direct visualization of the static and dynamic information of pressure. Moreover, our device enables quantitative estimation of the Young’s modulus of an elastomer, offering a new and facile characterization method for the mechanical properties of soft materials.