Red-Shifted Emission in Multiple Resonance Thermally Activated Delayed Fluorescent Materials through Malononitrile Incorporation
Athan T. Gogoulis, Ryoga Hojo, Katrina Bergmann, Zachary M. Hudson
Abstract
Multiple resonance thermally activated delayed fluorescent (MR-TADF) materials offer higher color purity than conventional TADF materials but suffer from aggregation-caused quenching (ACQ) and rarely exhibit red emission. Herein, two malononitrile-substituted emitters are synthesized from a quinolino[3,2,1- de ]acridine-5,9-dione ( QAO ) MR-TADF precursor. Both materials maintain MR-TADF, while they display red-shifted fluorescence. They also overcome ACQ, displaying enhanced emission upon aggregation in solution and forming red-emissive J-aggregates in the solid state with photoluminescent quantum yields of 9 and 11%.
Topics & Concepts
MalononitrileFluorescenceChemistryPhotochemistryQuenching (fluorescence)PhotoluminescenceAcridineResonance (particle physics)Quantum yieldOptoelectronicsOrganic chemistryMaterials scienceOpticsParticle physicsCatalysisPhysicsOrganic Light-Emitting Diodes ResearchLuminescence and Fluorescent MaterialsPerovskite Materials and Applications