Achieving High Efficiency and Pure Blue Color in Hyperfluorescence Organic Light Emitting Diodes using Organo‐Boron Based Emitters

In the field of organic light-emitting diodes, organo-boron based thermally activated delayed fluorescence (TADF) emitters have witnessed outstanding achievements. However, it is still challenging to achieve pure blue color (CIE y < 0.20) along with high efficiencies. To overcome these hurdles, hyperfluorescence (HF) system suggests a key strategy for future display applications. Here, two TADF host materials, pMDBA-DI and mMDBA-DI, multi-resonance type tert-butyl substituted emitter t-Bu-ν-DABNA are reported, efficient HF devices. Among synthesized sensitized mMDBA-DI device exhibits external quantum efficiency 39.1% narrow emission full width at half maximum 19 nm = 0.15). The mainly attributed molecular orientation factor, enhanced photoluminescence yield, good characteristic Förster energy transfer.