Anna Hayer, Tanguy Van Regemorter, Bianca Höfer, Chris S. K. Mak, David Beljonne and Anna Köhler On the formation mechanism for electrically generated exciplexes in a carbazole–pyridine copolymer Journal of Polymer Science Part B: Polymer Physics 50
Understanding the formation of exiplexes is essential to improving device efficiency of organic light-emitting diodes (OLEDs). Using a copolymer model compound, the formation of exciplexes in operating OLEDs is shown to proceed by a two-step mechanism associated with nitrogen containing moieties. A hole localizes on the carbazole moiety and forms a charged inter-chain precursor complex, resulting in exciplex formation when an electron gets trapped on the precursor complex. Quantum chemical calculations demonstrate the role of a specific nitrogen-–nitrogen interaction in this process.
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