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

DOI: 10.1002/anie.202011745 DOI Help

Authors: Jessica Wade (Imperial College London) , Jochen R. Brandt (Imperial College London) , David Reger (Friedrich-Alexander-Universität Erlangen-Nürnberg) , Francesco Zinna (Università di Pisa) , Konstantin Y. Amsharov (Martin-Luther-Universität Halle-Wittenberg) , Norbert Jux (Friedrich-Alexander-Universität Erlangen-Nürnberg) , David L. Andrews (University of East Anglia) , Matthew J. Fuchter (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie International Edition , VOL 60 , PAGES 222 - 227

State: Published (Approved)
Published: January 2021
Diamond Proposal Number(s): 20376 , 21822

Open Access Open Access

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.

Journal Keywords: chirality; circular dichroism; FRET; helical structures; polymers

Subject Areas: Chemistry, Materials


Instruments: B23-Circular Dichroism

Added On: 02/03/2021 08:27

Documents:
anie.202011745.pdf

Discipline Tags:

Organic Chemistry Physical Chemistry Materials Science Chemistry

Technical Tags:

Spectroscopy Circular Dichroism (CD)