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Maintaining high power efficiency (PE) under high brightness is still a pressing problem for the practical application of organic light‐emitting diodes (OLEDs). Here, ultrahigh‐efficiency green phosphorescent OLEDs (PHOLEDs) with a record‐low voltage at luminance above 5000 cd m−2 are fabricated, by developing a novel anthracene/pyridine derivative as the electron‐transporting material (ETM) combined...
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%.
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