Asymmetrically Enhanced Coplanar‐Electrode Electroluminescence for Information Encryption and Ultrahighly Stretchable Displays

Abstract 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.