Donor-modified asymmetric N/B/O multi-resonance TADF emitters for high-performance deep-blue OLEDs with the BT.2020 color gamut

Spiro-acridine modified N/B/O type MR-TADF emitters realized deep blue fluorescence with an EQE max of 20.5% and CIE (0.147, 0.048), which is state-of-the-art efficiency for N/B/O type deep-blue MR emitters with CIE y approaching the BT.2020 standard.