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Thermally activated delayed fluorescence (TADF) materials, which enable the full harvesting of singlet and triplet excited states for light emission, are expected as the third‐generation emitters for organic light‐emitting diodes (OLEDs), superseding the conventional fluorescence and phosphorescence materials. High photoluminescence quantum yield (ΦPL), narrow‐band emission (or high color purity),...
The design of efficient and concentration‐insensitive metal‐free thermally activateddelayed fluorescence (TADF) materials is reported. Blue and green organic light‐emitting diodes (OLEDs) containing a hole‐transport layer, an undoped TADF emissive layer, and an electron‐transport layer achieve maximum external quantum efficiencies of 19%, which is comparable to the best doped OLEDs.
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