Hot Vibrational States in a High-Performance Multiple Resonance Emitter and the Effect of Excimer Quenching on Organic Light-Emitting Diodes
Kleitos Stavrou, Andrew Danos, Toshiki Hama, Takuji Hatakeyama, Andrew P. Monkman
Abstract
. Organic light-emitting diodes with ν-DABNA as a hyperfluorescent emitter (0.5 wt % and 1 wt %) exhibit an increase of maximum external quantum efficiency, reaching 27.5% for the lower ν-DABNA concentration. On the contrary, a Förster radius analysis indicated that the energy transfer ratio is smaller because of higher donor-acceptor separation (>2.4 nm) with weak sensitizer emission observed in the electroluminescence. This indicates excimer quenching in 1 wt % devices.
Topics & Concepts
Materials scienceExcimerExcitonIntersystem crossingExcited stateOLEDOptoelectronicsFull width at half maximumSinglet stateMolecular physicsAtomic physicsFluorescenceOpticsChemistryPhysicsNanotechnologyLayer (electronics)Condensed matter physicsOrganic Light-Emitting Diodes ResearchLuminescence and Fluorescent MaterialsOrganic Electronics and Photovoltaics