A research group led by Associate Professor Ken Albrecht and Technical Staff Keiko Yamaoka from the Institute for Materials Chemistry and Engineering, Kyushu University, together with Professor Ruben Costa and PhD student Luca M. Cavinato from the Technical University of Munich Straubing Campus, developed a novel dendrimer-type thermally activated delayed fluorescence (TADF) material with excellent miscibility with electrolytes. By combining the developed dendrimer with cellulose (biomass)-derived electrolytes, they fabricated a yellow-emitting light-emitting electrochemical cell (LEC) and achieved a luminance half-life of 1300 hours.