A Three Boron doped B/O/N Multi-Resonant TADF Emitter for Improved Reverse Intersystem Crossing Rate and Efficient Pure Blue Organic Light-Emitting Diodes Multiresonant thermally activated delayed fluorescence (MR-TADF) compounds exhibit significant potential as emitters in organic light-emitting diodes (OLEDs) due to their bright, narrowband emission, which provides a solution to the color saturation required by industry for ultra-high definition (UHD) displays.