High-Performance Multiple-Resonance Thermally Activated Delayed Fluorescence Emitter with Targeted Deuteration Donor

Abstract

Herein, the MR-TADF emitter BN-pCzPhD is obtained by integrating targeted deuterated donor at the para-position of BCzBN core. The substantial improvement in PLQY and kRISC is observed compared to its protonated counterpart BN-pCzPh. The non-sensitized OLED based on BN-pCzPhD exhibits the best device performance with EL peak at 500 nm, FWHM of 34 nm, and the maximum EQE of 37.6%, respectively, with reduced efficiency roll-off.