Ternary Wrapped Nitrogen/Carbonyl Multiresonance TADF Emitters with Quenching-Resistant Abilities

Multiresonance thermally activated delayed fluorescence (MR-TADF) materials with rigid planar structures offer high photoluminescence quantum yields and narrowband emission for display applications. However, aggregation-caused quenching (ACQ) caused by chromophore interactions can detrimentally affect device performance. To address this, we modified MR-TADF chromophores with bulky terphenyl groups, successfully synthesizing the blue emitter TTPQAO. Its distorted structure effectively suppresses ACQ. Remarkably, at doping concentrations from 2 to 20 wt %, the external quantum efficiency only decreased by 4.3% with a slight fwhm broadening of 1 nm. Our work provides a practical approach to mitigate ACQ in TADF materials.