A rigid donor unit strategy enables highly efficient narrowband blue multi-resonance thermally activated delayed fluorescence emitters.

2 and Table S1, for BTC-BN, considerably significant SOC matrix elements, 〈S 1 |Ĥ SOC |T m 〉, ranging from 0.14 to 1.30 cm −1 , were estimated for the multiple T m → S 1 channels, which are higher than that of BFC-BN ( Fig. 2 ).

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