Ultratransparent, Ultraconformable, and High‐Efficiency Skin‐Like OLEDs for Large‐Area Imperceptible See‐Through Displays

Transparent skin‐like organic light‐emitting diodes (TS‐OLEDs) represent a transformative technology for next‐generation imperceptible see‐through electronics, including wearable imaging systems, invisible electronic skins, and implanted phototherapy devices. However, simultaneously achieving high transparency, exceptional conformability, and high efficiency remains a significant challenge due to the intrinsic trade‐offs in existing electrode materials. Herein, we developed a multilayer interfacial composite approach to construct high‐performance transparent electrodes, enabling ultratransparent, ultraconformable, and high‐efficiency skin‐like OLEDs with large‐area scalability. The optimized cathode and anode achieve high and symmetric transmittance of 88.3% and 87.5% at 550 nm, resulting in a record‐breaking device transmittance of 80.7%, representing the first TS‐OLEDs to surpass the 80% threshold. Based on these versatile electrodes, the device exhibits symmetric characteristics from both sides and exceptional overall optoelectronic performance, with a maximum current efficiency (CE) and external quantum efficiency (EQE) of 87.2 cd/A and 24.9%, surpassing all previously reported TS‐OLEDs. Furthermore, a novel non‐destructive transfer printing strategy enables an ultrathin form factor (∼2.3 µm thickness), achieving imperceptible skin conformability and stable operation under diverse mechanical deformations. Demonstrating practical applicability, large‐area (50 × 50 mm 2 ) devices and an integrated physiological real‐time monitoring system are successfully developed, establishing a feasible pathway toward large‐area imperceptible see‐through displays.