Ji Junpeng, Perepichka Igor F, Bai Junwu, Hu Dan, Xu Xiuru, Liu Ming, Wang Tao, Zhao Changbin, Meng Hong, Huang Wei
School of Advanced Materials, Peking University Shenzhen Graduate School, 2199 Lishui Road, Shenzhen, 518055, China.
Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, China.
Nat Commun. 2021 Jan 4;12(1):54. doi: 10.1038/s41467-020-20265-2.
Current power supply networks across the world are mostly based on three-phase electrical systems as an efficient and economical way for generation, transmission and distribution of electricity. Now, many electrically driven devices are relying on direct current or single-phase alternating current power supply that complicates utilization of three-phase power supply by requiring additional elements and costly switching mechanisms in the circuits. For example, light-emitting devices, which are now widely used for displays, solid-state lighting etc. typically operate with direct current power sources, although single-phase alternating current driven light-emitting devices have also gained significant attention in the recent years. Yet, light-emitting devices directly driven by a three-phase electric power has never been reported before. Benefiting from our precious work on coplanar electrodes structured light-emitting devices, in this article we demonstrate proof of a concept that light-emitting components can be driven by three-phase electric power without utilizing intricate back-end circuits and can compose state detection sensors and pixel units in a single device inspiring from three primary colors. Here we report a three-phase electric power driven electroluminescent devices fabricated featuring of flexibility and multi-functions. The design consists of three coplanar electrodes with dielectric layer(s) and light emission layer(s) coated on a top of input electrodes. It does not require transparent electrodes for electrical input and the light emission occurs when the top light-emitting layers are connected through a polar bridge. We demonstrate some applications of our three-phase electric power driven electroluminescent devices to realize pixel units, interactive rewritable displays and optical-output sensors. Furthermore, we also demonstrate the applicability of three-phase electrical power source to drive organic light-emitting devices with red, green and blue-emitting pixels and have shown high luminance (up to 6601 cd/m) and current efficiency (up to 16.2 cd/A) from fabricated three-phase organic light-emitting devices. This novel geometry and driving method for electroluminescent devices is scalable and can be utilized even in a wider range of other types of light-emitting devices and special units.
目前，全球的供电网络大多基于三相电力系统，这是一种发电、输电和配电的高效且经济的方式。如今，许多电动设备依赖直流或单相交流电源，这使得三相电源的利用变得复杂，因为电路中需要额外的元件和昂贵的开关机制。例如，目前广泛用于显示器、固态照明等的发光设备通常使用直流电源运行，尽管近年来单相交流驱动的发光设备也受到了广泛关注。然而，此前从未有过由三相电力直接驱动的发光设备的报道。得益于我们在共面电极结构发光器件方面的宝贵工作，在本文中，我们证明了一个概念：发光组件可以由三相电力驱动，而无需使用复杂的后端电路，并且可以在单个器件中组成状态检测传感器和像素单元，灵感来自三原色。在此，我们报道了一种具有灵活性和多功能性的三相电力驱动的电致发光器件。该设计由三个共面电极组成，电极上涂覆有介电层和发光层。它不需要用于电输入的透明电极，当顶部发光层通过极性桥连接时就会发光。我们展示了我们的三相电力驱动的电致发光器件在实现像素单元、交互式可重写显示器和光输出传感器方面的一些应用。此外，我们还展示了三相电源驱动具有红、绿、蓝发光像素的有机发光器件的适用性，并展示了所制备的三相有机发光器件具有高亮度（高达6601 cd/m）和电流效率（高达16.2 cd/A）。这种用于电致发光器件的新颖几何结构和驱动方法具有可扩展性，甚至可以应用于更广泛的其他类型的发光器件和特殊单元。
