Luminous Butterflies: Efficient Exciton Harvesting by Benzophenone Derivatives for Full-Color Delayed Fluorescence OLEDs

Butterfly‐shaped luminescent benzophenone derivatives with small energy gaps between their singlet and triplet excited states are used to achieve efficient full‐color delayed fluorescence. Organic light‐emitting diodes (OLEDs) with these benzophenone derivatives doped in the emissive layer can generate electroluminescence ranging from blue to orange–red and white, with maximum external quantum efficiencies of up to 14.3 %. Triplet excitons are efficiently harvested through delayed fluorescence channels. Schmetterlingsförmige Benzophenonderivate mit kleinen Energiedifferenzen für angeregte Singulett‐ und Triplettzustände zeigen eine effiziente verzögerte Fluoreszenz. Organische Leuchtdioden mit diesen Benzophenonen als Emittern liefern Elektrolumineszenzen in großen Teilen des gesamten Farbspektrums, auch Weißlicht.