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Materials with small singlet–triplet splits (ΔESTs) are introduced as sensitizing hosts to excite fluorescent dopants, breaking the trade‐off between small ΔEST and high radiative decay rates. A highly efficient orange‐fluorescent organic light‐emitting diode (OLED) is prepared, showing a maximum external quantum efficiency of 12.2%.
Orange‐emitting phosphorescent organic light‐emitting diodes (PHOLEDs) are drawing more and more attention; however, high‐performance hosts designed for orange PHOLEDs are rare. Here, four indolocarbazole/1, 3, 5‐triazine hybrids are synthesized to optimize the singlet and triplet energies, as well as transporting properties, for ideal orange PHOLEDs. By introducing moieties with different electronegativity,...
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