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The dinuclear Ag(I) complex has been designed to show thermally activated delayed fluorescence (TADF) of high efficiency. Strongly electron-donating terminal ligands are introduced to destabilize the d orbitals of the Ag + ions. Consequently, the orbitals distinctly contribute to the HOMO, whereas the LUMO is localized on the bridging ligand. This ensures charge transfer character of the lowest excited singlet S 1 and triplet T 1 states. Accordingly, a small energy gap Δ E (S 1 –T 1 ) is obtained, being essential for TADF behavior. Photophysical investigations show that at ambient temperature the complex exhibits TADF reaching a quantum yield of Φ PL = 70% with the decay time of only τ = 1.9 μs, manifesting one of the fastest TADF decays observed so far. Such an outstanding TADF efficiency is based on a small value of Δ E (S 1 –T 1 ) = 480 cm –1 combined with a large transition rate of k (S 1 → S 0 ) = 2.2 × 10 7 s –1 .
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Shafikov et al. (2018) studied this question.
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