Design of Deep Blue Thermally Activated Delayed Fluorescence Materials
발표자
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초록
내용
Organic light-emitting diodes (OLEDs) using thermally activated delayed fluorescence (TADF) has been attracted many researchers since they can utilize both singlet and triplet excitons, thus theoretically can reach 100% internal quantum efficiency. Developing blue emitting TADF material is still challenging since they often suffer from low stability and broad emission spectrum. Here we report rationally designed TADF emitters with donor-acceptor configurations. Density functional theory (DFT) based calculations reveals spatially well separated highest occupied and lowest unoccupied molecular orbitals, resulting in small singlet-triplet splitting of ~10 meV. Spectroscopic measurements confirm their room-temperature TADF behavior with emission maximum ranging from 464-471 nm. Simple and rigid molecular structure further gives their chemical/electrochemical stability.