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.

The cross-sectional morphology of the device was characterized by a field emission SEM (ZEISS SUPRA 55, Carl Zeiss AG, Germany) and the elemental mapping showing the element distribution of the cross-section part of the device was measured by an energy dispersive spectrometer (Oxford X-Max 20; Oxford Instruments, plc.). The surface image was taken by a fluorescence microscope (Axio Scope A1, Carl Zeiss AG, Germany).Research data are not shared.

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.