Impedance Spectroscopy on Emerging Light-Emitting Diodes

Light-emitting diodes (LEDs) are cornerstone technologies in the display, lighting, and communication industries. Their applications are now expanding into nontraditional sectors, such as sensing, imaging, and bio-integrated electronics, by leveraging the thin-film form factors and wavelength tunability of emerging materials. Despite their promise, these unconventional LEDs often exhibit complex charge transport and recombination dynamics that challenge predictable design and optimization. This Spotlight explores impedance spectroscopy as a definitive diagnostic tool to probe, conceptualize, and model the diverse physical and chemical processes governing operation in emerging LEDs. By synthesizing fundamental principles with research highlights and future outlooks, this article demonstrates how impedance spectroscopy is indispensable for enhancing the efficiency, reliability, and stability of next-generation optoelectronic platforms.