Organic light-emitting transistors (OLETs) represent an emerging device platform that uniquely combines transistor switching with light generation, sensing, and control capabilities. Unlike their well-established diode counterparts, OLETs offer distinct advantages: simpler and more cost-effective fabrication, potentially lower power consumption, easier integration into complex architectures, and, remarkably, higher efficiency when using identical materials.

Our research focuses on understanding how field-effect mechanisms influence device performance, particularly examining how horizontal charge transport affects charge carrier dynamics, exciton formation, and radiative decay processes. We pursue a systematic optimization strategy, independently refining each device component, from efficient luminescent emitters, high-mobility semiconductors and high-k dielectric layers, including high-k oxides and sustainable (bio)polymers. A key focus area of our work involves thermally-activated delayed fluorescence (TADF) molecules, which enable efficient triplet harvesting without relying on scarce heavy-metal complexes, while also offering remarkable emission tunability through interface engineering.  Our findings demonstrate that OLETs are potentially competitive and efficient alternative in organic light-emission technologies, while not only advancing fundamental understanding of light generation mechanisms in field-effect devices but also paving the way toward more sustainable, high-performance optoelectronic platforms.