Traditional alternating‐current‐driven electroluminescent (AC‐EL) devices adopting a sandwich structure are commonly used in solid‐state lighting and displays, while the emerging coplanar‐electrode alternating‐current‐driven light‐emitting variants manifest excellent application prospects in intelligent, multifunctional, and full‐color displays, and sensing purposes. In this work, an asymmetrically enhanced coplanar‐electrode AC‐EL device with a universal and straightforward architecture is designed based on the impedance adjustment strategy. This newly devised asymmetric structure extends the functionalities of the coplanar‐electrode AC‐EL devices by overcoming the bottlenecks of complicated patterning procedures and high driving voltages of symmetric configuration. The developed device design enables a new type of information encryption and ultrahighly stretchable patterned displays. Notably, the novel encryption appliances demonstrate feasible encryption/decryption features, multiple encryptions, and practical applicability; the biaxially stretchable display devices achieve the highest tensile performance in the field of stretchable electroluminescent pattern displays, and outperform the ultrahighly stretchable sandwich devices in terms of simple patterning process, higher brightness, wider color gamut, and long‐term stability. The proposed configuration opens up new avenues for AC‐EL devices toward a plethora of smart applications in wearable electronics with intelligent displays, dynamic interaction of human‐machine interface, and soft robotics.
With the development of modern technology, the functions of smart windows are expected to be more abundant apart from reducing energy consumption. A viable and popular solution is to develop a versatile product. Here a multi‐functional tandem device enabled by ionic gels to form a smart glass that can be applied in manifold scenarios, is reported. The ionic gels successfully fulfill the multiple tasks of simultaneously being electrolytes, ion storage medium, as well as transparent electrodes, and help heighten the overall transparency of the devices. The novel tandem configuration simply consists of five stacking functional layers and is universal for DC‐driven electrochromic and AC‐driven electroluminescent sub‐devices. The newly‐developed devices demonstrate magnificent characteristics of high and tunable transparency (0–77%), selective infrared shielding ability, diversified displaying and decoration, excellent stability (3000 cycles), and even flexibility. Multifarious application scenarios of the structure in diversified device forms are proposed and presented. The proposed device architecture provides a facile methodology to fabricate functional devices and will provoke infinite novel ideas for developing the next‐generation smart windows.
Limited to the structure of traditional light-emitting devices, electronic devices that can directly convert machine language into human visual information without introducing any back-end circuit are still not easy to achieve. Based on a specially designed three-phase co-planar electrode structure, a new type of three-phase alternating current driven organic light-emitting device with the integration of emission and control functions, full-color tunability and simple device structure is demonstrated in this study. We integrate the light-emitting function of color-tunable light-emitting devices and the switching of three triodes in a single three phase organic light-emitting device. The state control of luminous color and luminance intensity merely requires the introduction of a kind of machine language, that is an easy-to-program 6-bit binary number coded digital signals. The color adjustable area covers 66% of the color triangle of the National Television System Committee. Such simple and easy-tointegrate light-emitting system has great potential applications in the next-generation man-machine interface.
Aiming at the problems of the confusion of user meter data in the distribution network and the difficulty in identifying the relationship, a creative method of identifying the topological structure of the station based on the conservation of current and energy is proposed. Through the calculation of the current data relationship, a mathematical relationship model based on energy conservation is established for the topological scene of the station. After constructing the mathematical model, through a series of transformation methods, the model is transformed into a convex optimization problem. By solving the model, the topological relationship of the station is finally obtained. Through the experimental verification and analysis of real data, the model algorithm proposed in this paper has higher accuracy and higher efficiency than manual screening, and has deeper research value.
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