Ultrathin High-Resolution Optoelectronic Devices for Skin-Attachable Electronic Applications

Soft electronic devices, in particular healthcare-related ones, have been intensively studied over the past decade due to their unique advantages in wearable applications over the conventional rigid electronics, including conformal contacts on human skin and high deformability that minimizes unwanted inflammatory responses. To achieve the soft nature in high performance electronics and to apply this technology to wearable biomedical electronics/optoelectronics, several strategies have been employed, such as the designed assembly of high-quality nanomaterials, combination of unconventional manufacturing processes with existing micro-processing technologies, new design of individual devices with deformable structures, and disease-specific system-level integration of diverse soft electronics. Here, we describe ultrathin high-resolution optoelectronic devices for skin-attachable electronic applications. New dry transfer printing techniques using intaglio trench and elastomeric stamp are demonstrated for the high resolution RGB sub-pixels up to ~2500 pixels per inch. Ultrathin high-resolution red-green-blue quantum dot LEDs and perovskite LEDs can be utilized next-generation skin-attachable electronic tattoo, transparent smart display, and display of healthcare monitoring wearable devices.