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In organic light‐emitting diode (OLED), achieving high efficiency requires effective triplet exciton confinement by carrier‐transporting materials, which typically have higher triplet energy (ET) than the emitter, leading to poor stability. Here, an electron‐transporting material (ETM), whose ET is 0.32 eV lower than that of the emitter is reported. In devices, it surprisingly exhibits strong confinement...
Colloidal perovskite nanocrystals (PNCs) display bright luminescence for light‐emitting diode (LED) applications; however, they require post‐synthesis ligand exchange that may cause surface degradation and defect formation. In situ‐formed PNCs achieve improved surface passivation using a straightforward synthetic approach, but their LED performance at the green wavelength is not yet comparable with...
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