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•An ACEL device was developed by combining in-plane E-field structure with ionogel.•Brightness(3,260 cd/m2), stretchability(500 %), and 2× power efficiency were acieved.•The device operates stably even under icy or boiling water conditions.
Recently, there have been notable strides in stretchable, adaptable displays capable of conforming to curved surfaces, including human interfaces, architecture, and vehicles. However, previous research mostly focused on coplanar structures, where the light-emitting layer is sandwiched between facing electrodes, leading to limited performance. This study introduces a breakthrough approach by embedding electrodes within the light-emitting layer and utilizing polymer electrolytes to increase lighting volume, resulting in exceptionally high brightness (3,260 cd/m2), stretchability (500 %), durability (5,000 cycles) and doubled power efficiency. Furthermore, the device with buried electrodes proves reliable even in harsh environments, such as ice or boiling water, commonly encountered in real-life scenarios. This concept paves the way for a new era of ACEL applications, including shape-adaptable outdoor lighting and displays, light-emitting soft robotics, and actuators capable of operating in challenging environmental conditions previously unattainable with other types of light-emitting devices.