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An exciton‐stimulated molecular transformation in an organic light‐emitting diode (OLED) on a time scale of a few seconds under electrical bias is shown to reach nearly 100% under standard operating conditions, leading to color switching. It is reversible in both a thin film and an OLED when sufficient thermal energy is supplied. Such an exciton‐stimulated molecular transformation suggests a new process...
Highly efficient single‐layer organic light‐emitting diodes (OLEDs) are demonstrated using new N‐heterocyclic carbazole‐based host materials. Phosphorescent OLEDs with a structure of ITO/MoO3/host/host:dopant/host/Cs2CO3/Al are fabricated in which the new materials act simultaneously as electron‐transport, hole‐transport, and host layer. Devices with maximum current and external quantum efficiencies...
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