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500‐Fold Amplification of Small Molecule Circularly Polarised Luminescence through Circularly Polarised FRET
Author(s) -
Wade Jessica,
Brandt Jochen R.,
Reger David,
Zinna Francesco,
Amsharov Konstantin Y.,
Jux Norbert,
Andrews David L.,
Fuchter Matthew J.
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202011745
Subject(s) - luminescence , photoluminescence , förster resonance energy transfer , materials science , molecule , polymer , dipole , acceptor , resonant inductive coupling , conjugated system , small molecule , optoelectronics , photochemistry , chemical physics , molecular physics , energy transfer , chemistry , optics , fluorescence , condensed matter physics , physics , biochemistry , organic chemistry , composite material
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 ( g PL ) less than 10 −2 . Here we describe an almost 10 3 ‐fold chiroptical amplification of a π‐extended superhelicene when embedded in an achiral conjugated polymer matrix. This combination increases the | g PL | 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.