500-fold amplification of small molecule circularly polarised luminescence through circularly polarised FRET

Jessica Wade, Jochen R. Brandt, David Reger, Franesco Zinna, Konstantin Y. Amsharov, Norbert Jux, David L. Andrews, Matthew J. Fuchter

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Abstract

Strongly dissymmetric circularly polarised (CP) luminescence from small organic molecules could transform a range of technologies, such as display devices. However, highly dissymmetric emission is usually not possible with small organic molecules, which typically give dissymmetric factors of photoluminescence (gPL) less than 10-2. Here we describe an almost 103-fold chiroptical amplification of a π-extended superhelicene when embedded in an achiral conjugated polymer matrix. This combination increases the |gPL| of the superhelicene from approximately 3 × 10-4 in solution to 0.15 in a blend film in the solid-state. We propose that the amplification arises not simply through a chiral environment effect, but instead due to electrodynamic coupling between the electric and magnetic transition dipoles of the polymer donor and superhelicene acceptor, and subsequent CP Förster resonance energy transfer. We show that this amplification effect holds across several achiral polymer hosts and thus represents a simple and versatile approach to enhance the g-factors of small organic molecules.
Original languageEnglish
Pages (from-to)222-227
Number of pages6
JournalAngewandte Chemie
Volume60
Issue number1
Early online date8 Oct 2020
DOIs
Publication statusPublished - 4 Jan 2021

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