Computationally Guided Molecular Design to Minimize the LE/CT Gap in D-π-A Fluorinated Triarylboranes for Efficient TADF via D and π-Bridge Tuning.
Ayush K NarsariaFlorian RauchJohannes KrebsPeter EndresAlexandra FriedrichIvo KrummenacherHolger BraunschweigMaik FinzeJörn NitschFriedrich Matthias BickelhauptTodd B MarderPublished in: Advanced functional materials (2020)
In this combined experimental and theoretical study, a computational protocol is reported to predict the excited states in D-π-A compounds containing the B(FXyl)2 (FXyl = 2,6-bis(trifluoromethyl)phenyl) acceptor group for the design of new thermally activated delayed fluorescence (TADF) emitters. To this end, the effect of different donor and π-bridge moieties on the energy gaps between local and charge-transfer singlet and triplet states is examined. To prove this computationally aided design concept, the D-π-B(FXyl)2 compounds 1-5 were synthesized and fully characterized. The photophysical properties of these compounds in various solvents, polymeric film, and in a frozen matrix were investigated in detail and show excellent agreement with the computationally obtained data. Furthermore, a simple structure-property relationship is presented on the basis of the molecular fragment orbitals of the donor and the π-bridge, which minimize the relevant singlet-triplet gaps to achieve efficient TADF emitters.
Keyphrases
- energy transfer
- quantum dots
- single molecule
- randomized controlled trial
- drug delivery
- light emitting
- electronic health record
- magnetic resonance imaging
- cancer therapy
- drug release
- density functional theory
- positron emission tomography
- room temperature
- image quality
- contrast enhanced
- molecular dynamics
- dual energy
- electron transfer