Published September 11, 2019 | Version v1
Journal article Open

Addressing Charge-Transfer and Locally-Excited States in aTwisted Biphenyl Push-Pull Chromophore

Authors/Creators

  • 1. University of Parma
  • 2. University of Rennes
  • 3. University of Bordeaux
  • 4. LENS

Description

We present the synthesis and spectroscopic characterization of twisted push–pull biphenyl molecule undergoing photo- induced electron transfer. Steady-state and transient absorption spectra suggest, in this rigid molecular structure, a subtle interplay between locally-excited and charge-transfer states, whose equilibrium and dynamics is only driven by solvation. A theoretical model is presented for the solvation dynamics and, with the support of quantum chemical calculations, we demonstrate the existence of two sets of states, having either local or charge-transfer character, that only “communicate” thanks to solvation, which is the sole driving force for the charge-separation process.

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Funding

European Commission
TADFlife - Using the smart matrix approach to enhance TADF-OLED efficiency and lifetime 812872