Thermally activated delayed fluorescence in a mechanically soft charge-transfer complex: role of the locally excited state
Kalyan Jyoti Kalita, Saikat Mondal, C. Malla Reddy, Ratheesh K. Vijayaraghavan
Abstract
LE) to ensure efficient TADF. Such intermediate states guarantee a naturally forbidden, energetically uphill reverse intersystem crossing (RISC) process, which is paramount for effective TADF. A unique single-crystal packing feature with isolated D-A-D trimeric units ensured minimal non-radiative exciton loss, leading to a high PLQY and displaying interesting mechanical plastic bending behaviour. Thus, a comprehensive approach involving a non-covalent strategy to circumvent the conflicting requirements of a small effective singlet-triplet energy offset and a high oscillator strength for efficient TADF emitters is achieved here.
Topics & Concepts
Intersystem crossingPhotoluminescenceSinglet stateMaterials scienceQuantum yieldAcceptorExcitonExcited stateChemical physicsFluorescenceNanotechnologyOptoelectronicsChemistryAtomic physicsPhysicsQuantum mechanicsOrganic Light-Emitting Diodes ResearchLuminescence and Fluorescent MaterialsPerovskite Materials and Applications