Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 15: Organic Semiconductors: Optics and Photonics
HL 15.5: Talk
Tuesday, March 10, 2026, 10:30–10:45, POT/0006
Spectral diffusion of charge-transfer states in organic donor:acceptor blends due to carrier relaxation — •Giacomo Cotelli1, Anna Köhler1, and Reinder Coehoorn2 — 1University of Bayreuth, Bayreuth, Germany — 2Eindhoven University of Technology, Eindhoven, The Netherlands
Blends of small-molecule organic semiconductors may display emission from an intermolecular charge transfer (CT) excited state. An aspect that is not well understood so far is the spectral diffusion of such CT states. We present a comprehensive study of CT state spectral diffusion in two- and three-component blends, using kinetic Monte Carlo simulations. We disentangle the effects of the CT state lifetime, charge carrier energetic disorder and blend composition on the emission spectra. Furthermore, we highlight similarities and differences between the emission of photogenerated CT states in films and electrically generated CT states in OLEDs.
Keywords: Exciplex; Charge transfer state; Kinetic Monte Carlo; Spectral diffusion; Charge transport