articleNature CommunicationsNov 30, 2016GOLD OA

Revealing the spin–vibronic coupling mechanism of thermally activated delayed fluorescence

MKMarc K. EtheringtonJGJamie GibsonHFHeather F. HigginbothamTJThomas J. PenfoldAPAndrew P. Monkman

Durham University · Newcastle University

PubMed
Indexed incrossrefdoajpubmed

Abstract

Knowing the underlying photophysics of thermally activated delayed fluorescence (TADF) allows proper design of high efficiency organic light-emitting diodes. We have proposed a model to describe reverse intersystem crossing (rISC) in donor-acceptor charge transfer molecules, where spin-orbit coupling between singlet and triplet states is mediated by one of the local triplet states of the donor (or acceptor). This second order, vibronically coupled mechanism describes the basic photophysics of TADF. Through a series of measurements, whereby the energy ordering of the charge transfer (CT) excited states and the local triplet are tuned in and out of resonance, we show that TADF reaches a maximum at the resonance…

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Topics & keywords

Topics
Keywords
  • Intersystem crossing
  • Singlet state
  • Excited state
  • Acceptor
  • Triplet state
  • OLED
  • Coupling (piping)
  • Resonance (particle physics)
UN Sustainable Development Goals
  • Affordable and clean energy
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