Light Emission from Organic Semiconductors and Rare-Earth Complexes: Devices and Applications

Organic light-emitting diodes (OLEDs) provide a versatile platform linking molecular design, photophysics, thin-film engineering, and device architecture. This talk presents our research on OLEDs incorporating europium, terbium, neodymium, erbium, and ytterbium complexes, highlighting their narrow emission bands, high color purity, and luminescence from the visible to the near-infrared. Emphasis will be placed on how ligand design, coordination environment, antenna-mediated energy transfer, and device structure affect photoluminescence and electroluminescence. Selected examples will illustrate key opportunities and challenges related to charge transport, energy transfer, efficiency, and stability in visible- and near-infrared-emitting devices. The discussion will also connect these results to broader advances in organic light-emitting technologies, including thermally activated delayed fluorescence, hyperfluorescence, photodetection, and optical upconversion. By integrating coordination chemistry, molecular photophysics, and organic electronics, these systems offer promising pathways toward displays, sensing, near-infrared technologies, and bio-related optoelectronic applications, while expanding the functional scope of emerging organic and hybrid optoelectronic device platforms.