Department of Materials Science and Engineering , Yonsei University Yonsei-ro 50 , Seodaemun-gu, Seoul 03722 , Republic of Korea.
Department of Polymer Science and Engineering , Inha University Yonghyeon-dong , Nam-gu, Incheon 22212 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Apr 25;10(16):13757-13766. doi: 10.1021/acsami.8b01790. Epub 2018 Apr 11.
Simultaneous sensing and visualization of pressure provides a useful platform to obtain information about a pressurizing object, but the fabrication of such interactive displays at the single-device level remains challenging. Here, we present a pressure responsive electroluminescent (EL) display that allows for both sensing and visualization of pressure. Our device is based on a two-terminal capacitor with six constituent layers: top electrode/insulator/hole injection layer/emissive layer/electron transport layer/bottom electrode. Light emission upon exposure to an alternating current field between two electrodes is controlled by the capacitance change of the insulator arising from the pressure applied on top. Besides capacitive pressure sensing, our EL display allows for direct visualization of the static and dynamic information of position, shape, and size of a pressurizing object on a single-device platform. Monitoring the pressurized area of an elastomeric hemisphere on a device by EL enables quantitative estimation of the Young's modulus of the elastomer, offering a new and facile characterization method for the mechanical properties of soft materials.
同时感测和可视化压力提供了一个有用的平台，可以获取有关加压物体的信息，但在单个设备级别上制造这种交互式显示器仍然具有挑战性。在这里，我们提出了一种对压力敏感的电致发光 (EL) 显示器，它允许同时感测和可视化压力。我们的设备基于具有六个组成层的两个端子电容器：顶电极/绝缘体/空穴注入层/发射层/电子传输层/底电极。通过在两个电极之间施加交流电场，光发射受到顶部施加的压力引起的绝缘体电容变化的控制。除了电容式压力感测外，我们的 EL 显示器还允许在单个设备平台上直接可视化位置、形状和尺寸的静态和动态信息。通过 EL 监测设备上弹性半球体的受压区域，可以定量估计弹性体的杨氏模量，为软材料的机械性能提供了一种新的简便表征方法。
