A new solution-processable MR-TADF emitter, 2,7-tBuCzNB, has been designed and synthesized. The SCS-(ADC)2 calculations, the narrowband emission at 493 nm (FWHM of 32 nm) in toluene and the weakly positive solvatochromism all corroborate that the emissive S1 state possesses SRCT character. The introduction of twisted second-generation tert-butyl carbazole donor dendrons alleviates ACQ in films at doping concentrations of 10 wt%.