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Multi‐resonance TADF (MR‐TADF) emitters are promising for high‐resolution OLEDs, but the concurrent optimization of excited‐state dynamics and color purity remains a tough challenge. Herein, three deep‐blue MR‐TADF compounds (BN1–BN3) featuring gradually enlarged ring‐fused structures and increased rigidity are accessed by lithium‐free borylation in high yields from the same precursor, with all the...
Multi‐layer π‐stacked emitters based on spatially confined donor/acceptor/donor (D/A/D) patterns have been developed to achieve high‐efficiency thermally activated delayed fluorescence (TADF). In this case, dual donor moieties and a single acceptor moiety are introduced to form two three‐dimensional (3D) emitters, DM‐BD1 and DM‐BD2, which rely on spatial charge transfer (CT). Owing to the enforced...
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