59‐1: Recent Advances in Boron‐based MR‐TADF Materials

Multiple‐resonance thermally activated delayed fluorescence (MR‐TADF) materials are promising emitters for OLEDs because they combine narrowband emission with efficient exciton utilization. Here we summarize recent advances in boron‐based MR‐TADF materials enabled by innovative borylation strategies. A chlorine‐enabled one‐shot double borylation unlocks π‐extended MR frameworks with modular color tuning in the green region, while a late‐stage direct double borylation induces hypsochromic shifts and enhances radiative and reverse intersystem crossing processes for deep‐blue emission. These approaches lead to OLEDs with high external quantum efficiency, excellent color purity, and outstanding operational stability in sensitized device architectures.