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Equilibrating the critical parameters associated with the thermally activated delayed fluorescence process proposes the prerequisite for realizing high performance electroluminescence devices. Herein, precise manipulations relying on the model near-infrared emitter are successfully demonstrated, affording improved maximum external quantum efficiencies of 18.9% (@630 nm) and 12.6% (@680 nm).

Graphical abstract: Equilibrating the key parameters of thermally activated delayed fluorescence emitters towards efficient red/near-infrared OLEDs

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