Review on Fabrication of Compound Semiconductor-Based Flexible Light-Emitting Devices and Displays

Le résumé fourni par la source

This article presents a review of research activities over past decades focused on the fabrication of flexible light-emitting diodes (LEDs) and micro-LED displays. LEDs exhibit excellent material characteristics, including high radiative recombination rates, high carrier mobility, and ultra-long-term stability. These features make LEDs promising candidates for not only the future metaverse display but flexible display applications. However, the brittleness of compound semiconductor thin films poses challenges for creating deformable LED devices. Consequently, significant efforts have been dedicated to imparting deformability to LED devices and displays. We initially discuss a display prepared using a nanowire-assembly process, followed by a strategy involving thin film LEDs for flexible device fabrication. Vertical nanowire LED arrays are presented, along with a discussion of their advantages for flexible devices and displays. Furthermore, we review the selective-area epitaxy of vertical nanowire LED arrays. Finally, we briefly introduce the assembly methods of LEDs onto backplane circuits, addressing several important issues, including the misalignment of LED transfers onto backplane circuits. We conclude with personal remarks on the challenges and future perspectives for research on flexible micro-LED displays.

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