Moon Kee Choi‍

Moon Kee Choi‍

Associate Professor,

Ulsan National Institute of Science and Technology，

Moon Kee Choi is an Associate professor in Department of Materials Science and Engineering of Ulsan National Institute of Science and Technology (UNIST). She received her B.S. (2010) and Ph.D (2016) in Chemical and Biological Engineering from Seoul National University, under the supervisionof Prof. Dae-Hyeong Kim. She subsequently conducted postdoctoral research at UC Berkeley, focusing on biomaterial based soft robotics. Her current research focuses on the development of high-resolution and stretchable optoelectronic devices, including quantum-dot- and perovskite-based light-emitting diodes, as well as their integration into skin-attachable displays, biomedical electronics, and soft robotic systems.

Title

High-definition & deformable quantum dot light-emitting diodes via transfer printing

Abstract：

As next-generation electronic systems increasingly require displays that are not only highly efficient and high-resolution but also mechanically deformable, quantum dot light-emitting diodes (QLEDs) have emerged as a promising platform. Quantum dots (QDs) offer outstanding photoluminescence quantum yield, a wide color gamut, and narrow emission bandwidths, making them ideal for ultrahigh-definition displays. However, realizing densely packed, high-resolution RGB sub-pixel patterns together with high device efficiency and mechanical deformability remains a major challenge. In this presentation, I will introduce high-definition and highly efficient QLEDs enabled by advanced transfer-printing strategies. By precisely transferring QD-based emissive layers with minimal solvent exposure, this approach achieves densely packed nanocrystal films with reduced interfacial defects and leakage currents, leading to significantly enhanced external quantum efficiency. Building on this platform, I will further present ultrathin and intrinsically stretchable QLEDs that maintain high brightness and color purity under large mechanical deformation. These deformable QLEDs enable new classes of multicolor, skin-attachable, and shape-adaptive displays, providing a pathway toward display form factors that extend well beyond conventional foldable and rollable technologies.